[MERGED] osmo-gsm-tester[master]: fix and refactor logging: drop 'with', simplify

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Neels Hofmeyr gerrit-no-reply at lists.osmocom.org
Tue Jun 13 13:15:23 UTC 2017


Neels Hofmeyr has submitted this change and it was merged.

Change subject: fix and refactor logging: drop 'with', simplify
......................................................................


fix and refactor logging: drop 'with', simplify

With the recent fix of the junit report related issues, another issue arose:
the 'with log.Origin' was changed to disallow __enter__ing an object twice to
fix problems, now still code would fail because it tries to do 'with' on the
same object twice. The only reason is to ensure that logging is associated with
a given object. Instead of complicating even more, implement differently.

Refactor logging to simplify use: drop the 'with Origin' style completely, and
instead use the python stack to determine which objects are created by which,
and which object to associate a log statement with.

The new way: we rely on the convention that each class instance has a local
'self' referencing the object instance. If we need to find an origin as a new
object's parent, or to associate a log message with, we traverse each stack
frame, fetching the first local 'self' object that is a log.Origin class
instance.

How to use:

Simply call log.log() anywhere, and it finds an Origin object to log for, from
the stack. Alternatively call self.log() for any Origin() object to skip the
lookup.

Create classes as child class of log.Origin and make sure to call
super().__init__(category, name). This constructor will magically find a parent
Origin on the stack.

When an exception happens, we first escalate the exception up through call
scopes to where ever it is handled by log.log_exn(). This then finds an Origin
object in the traceback's stack frames, no need to nest in 'with' scopes.

Hence the 'with log.Origin' now "happens implicitly", we can write pure natural
python code, no more hassles with scope ordering.

Furthermore, any frame can place additional logging information in a frame by
calling log.ctx(). This is automatically inserted in the ancestry associated
with a log statement / exception.

Change-Id: I5f9b53150f2bb6fa9d63ce27f0806f0ca6a45e90
---
M selftest/config_test.ok
M selftest/log_test.ok
M selftest/log_test.py
M selftest/resource_test.ok
M selftest/resource_test.py
M selftest/suite_test.ok
M selftest/suite_test.py
M selftest/template_test.ok
M src/osmo_gsm_tester/bts_osmotrx.py
M src/osmo_gsm_tester/bts_sysmo.py
M src/osmo_gsm_tester/config.py
M src/osmo_gsm_tester/event_loop.py
M src/osmo_gsm_tester/log.py
M src/osmo_gsm_tester/ofono_client.py
M src/osmo_gsm_tester/osmo_bsc.py
M src/osmo_gsm_tester/osmo_ctrl.py
M src/osmo_gsm_tester/osmo_hlr.py
M src/osmo_gsm_tester/osmo_mgcpgw.py
M src/osmo_gsm_tester/osmo_msc.py
M src/osmo_gsm_tester/osmo_nitb.py
M src/osmo_gsm_tester/pcap_recorder.py
M src/osmo_gsm_tester/process.py
M src/osmo_gsm_tester/resource.py
M src/osmo_gsm_tester/schema.py
M src/osmo_gsm_tester/suite.py
M src/osmo_gsm_tester/template.py
M src/osmo_gsm_tester/trial.py
27 files changed, 444 insertions(+), 456 deletions(-)

Approvals:
  Pau Espin Pedrol: Looks good to me, approved
  Jenkins Builder: Verified



diff --git a/selftest/config_test.ok b/selftest/config_test.ok
index 40a5dcb..80b5a06 100644
--- a/selftest/config_test.ok
+++ b/selftest/config_test.ok
@@ -54,42 +54,42 @@
 --- -: ERR: ValueError: config item not known: 'a_dict[]'
 Validation: Error
 - unknown band:
---- (item='bts[].trx[].band'): ERR: ValueError: Unknown GSM band: 'what'
+--- bts[].trx[].band: ERR: ValueError: Unknown GSM band: 'what'
 Validation: Error
 - invalid v4 addrs:
---- (item='addr[]'): ERR: ValueError: Invalid IPv4 address: '1.2.3'
+--- addr[]: ERR: ValueError: Invalid IPv4 address: '1.2.3'
 Validation: Error
---- (item='addr[]'): ERR: ValueError: Invalid IPv4 address: '1.2.3 .4'
+--- addr[]: ERR: ValueError: Invalid IPv4 address: '1.2.3 .4'
 Validation: Error
---- (item='addr[]'): ERR: ValueError: Invalid IPv4 address: '91.2.3'
+--- addr[]: ERR: ValueError: Invalid IPv4 address: '91.2.3'
 Validation: Error
---- (item='addr[]'): ERR: ValueError: Invalid IPv4 address: 'go away'
+--- addr[]: ERR: ValueError: Invalid IPv4 address: 'go away'
 Validation: Error
---- (item='addr[]'): ERR: ValueError: Invalid IPv4 address: ''
+--- addr[]: ERR: ValueError: Invalid IPv4 address: ''
 Validation: Error
---- (item='addr[]'): ERR: ValueError: Invalid IPv4 address: None
+--- addr[]: ERR: ValueError: Invalid IPv4 address: None
 Validation: Error
 - invalid hw addrs:
---- (item='hwaddr[]'): ERR: ValueError: Invalid hardware address: '1.2.3'
+--- hwaddr[]: ERR: ValueError: Invalid hardware address: '1.2.3'
 Validation: Error
---- (item='hwaddr[]'): ERR: ValueError: Invalid hardware address: '0b:0c:0d:0e:0f:0g'
+--- hwaddr[]: ERR: ValueError: Invalid hardware address: '0b:0c:0d:0e:0f:0g'
 Validation: Error
---- (item='hwaddr[]'): ERR: ValueError: Invalid hardware address: '0b:0c:0d:0e : 0f:0f'
+--- hwaddr[]: ERR: ValueError: Invalid hardware address: '0b:0c:0d:0e : 0f:0f'
 Validation: Error
---- (item='hwaddr[]'): ERR: ValueError: Invalid hardware address: 'go away'
+--- hwaddr[]: ERR: ValueError: Invalid hardware address: 'go away'
 Validation: Error
---- (item='hwaddr[]'): ERR: ValueError: Invalid hardware address: ''
+--- hwaddr[]: ERR: ValueError: Invalid hardware address: ''
 Validation: Error
---- (item='hwaddr[]'): ERR: ValueError: Invalid hardware address: None
+--- hwaddr[]: ERR: ValueError: Invalid hardware address: None
 Validation: Error
 - invalid imsis:
---- (item='imsi[]'): ERR: ValueError: Invalid IMSI: '99999999x9'
+--- imsi[]: ERR: ValueError: Invalid IMSI: '99999999x9'
 Validation: Error
---- (item='imsi[]'): ERR: ValueError: Invalid IMSI: '123 456 789 123'
+--- imsi[]: ERR: ValueError: Invalid IMSI: '123 456 789 123'
 Validation: Error
---- (item='imsi[]'): ERR: ValueError: Invalid IMSI: 'go away'
+--- imsi[]: ERR: ValueError: Invalid IMSI: 'go away'
 Validation: Error
---- (item='imsi[]'): ERR: ValueError: Invalid IMSI: ''
+--- imsi[]: ERR: ValueError: Invalid IMSI: ''
 Validation: Error
---- (item='imsi[]'): ERR: ValueError: Invalid IMSI: None
+--- imsi[]: ERR: ValueError: Invalid IMSI: None
 Validation: Error
diff --git a/selftest/log_test.ok b/selftest/log_test.ok
index 7ed94a0..17198b7 100644
--- a/selftest/log_test.ok
+++ b/selftest/log_test.ok
@@ -32,10 +32,9 @@
 01:02:03 ---                 LogTest: hello log, no category nor name set  [log_test.py:110]
 01:02:03 ---                 LogTest: DBG: debug message, no category nor name set  [log_test.py:113]
 - Testing logging of Exceptions, tracing origins
-Not throwing an exception in 'with:' works.
 nested print just prints
-01:02:03 tst level3: nested log()  [level1↪level2↪level3]  [log_test.py:145]
-01:02:03 tst level2: nested l2 log() from within l3 scope  [level1↪level2]  [log_test.py:146]
-01:02:03 tst level3: ERR: ValueError: bork  [level1↪level2↪level3]  [log_test.py:147: raise ValueError('bork')]
-- Enter the same Origin context twice
+01:02:03 tst level3: nested log()  [level1↪level2↪level3]  [log_test.py:135]
+01:02:03 tst level2: nested l2 log() from within l3 scope  [level1↪level2]  [log_test.py:136]
+01:02:03 tst level3: ERR: ValueError: bork  [level1↪level2↪level3]  [log_test.py:137: raise ValueError('bork')]
+- Disallow origin loops
 disallowed successfully
diff --git a/selftest/log_test.py b/selftest/log_test.py
index 7670c8e..9136906 100755
--- a/selftest/log_test.py
+++ b/selftest/log_test.py
@@ -32,20 +32,20 @@
 log.set_all_levels(None)
 
 print('- Testing global log functions')
-log.log('<origin>', log.C_TST, 'from log.log()')
-log.dbg('<origin>', log.C_TST, 'from log.dbg(), not seen')
+log.log('from log.log()', _origin='<origin>', _category=log.C_TST)
+log.dbg('from log.dbg(), not seen', _origin='<origin>', _category=log.C_TST)
 log.set_level(log.C_TST, log.L_DBG)
-log.dbg('<origin>', log.C_TST, 'from log.dbg()')
+log.dbg('from log.dbg()', _origin='<origin>', _category=log.C_TST)
 log.set_level(log.C_TST, log.L_LOG)
-log.err('<origin>', log.C_TST, 'from log.err()')
+log.err('from log.err()', _origin='<origin>', _category=log.C_TST)
 
 print('- Testing log.Origin functions')
 class LogTest(log.Origin):
-    pass
+    def __init__(self, *name_items, **detail_items):
+        super().__init__(log.C_TST, *name_items, **detail_items)
 
-t = LogTest()
-t.set_log_category(log.C_TST)
-t.set_name('some', 'name', some="detail")
+t = LogTest('some', 'name', some="detail")
+
 	
 t.log("hello log")
 t.err("hello err")
@@ -86,10 +86,10 @@
 log.style_change(origin=True)
 t.dbg("add origin")
 
+# some space to keep source line numbers identical to previous code
+
 print('- Testing origin_width')
-t = LogTest()
-t.set_log_category(log.C_TST)
-t.set_name('shortname')
+t = LogTest('shortname')
 log.style(origin_width=23, time_fmt=fake_time)
 t.log("origin str set to 23 chars")
 t.set_name('very long name', some='details', and_some=(3, 'things', 'in a tuple'))
@@ -97,16 +97,16 @@
 t.dbg("long origin str dbg")
 t.err("long origin str err")
 
+
 print('- Testing log.Origin with omitted info')
 t = LogTest()
-t.set_log_category(log.C_TST)
 t.log("hello log, name implicit from class name")
 
-t = LogTest()
-t.set_name('explicit_name')
+t = LogTest('explicit_name')
+t._set_log_category(None)
 t.log("hello log, no category set")
-
 t = LogTest()
+t._set_log_category(None)
 t.log("hello log, no category nor name set")
 t.dbg("hello log, no category nor name set, not seen")
 log.set_level(log.C_DEFAULT, log.L_DBG)
@@ -117,47 +117,37 @@
 
 class Thing(log.Origin):
     def __init__(self, some_path):
-        self.set_log_category(log.C_TST)
-        self.set_name(some_path)
+        super().__init__(log.C_TST, some_path)
 
     def say(self, msg):
         print(msg)
 
-#log.style_change(trace=True)
+    def l1(self):
+        level2 = Thing('level2')
+        level2.l2()
 
-with Thing('print_redirected'):
-    print("Not throwing an exception in 'with:' works.")
+    def l2(self):
+        level3 = Thing('level3')
+        level3.l3(self)
 
-def l1():
-    level1 = Thing('level1')
-    with level1:
-        l2()
-
-def l2():
-    level2 = Thing('level2')
-    with level2:
-        l3(level2)
-
-def l3(level2):
-    level3 = Thing('level3')
-    with level3:
+    def l3(self, level2):
         print('nested print just prints')
-        level3.log('nested log()')
+        self.log('nested log()')
         level2.log('nested l2 log() from within l3 scope')
         raise ValueError('bork')
 
 try:
-    l1()
+    level1 = Thing('level1')
+    level1.l1()
 except Exception:
     log.log_exn()
 
-print('- Enter the same Origin context twice')
+print('- Disallow origin loops')
 try:
     t = Thing('foo')
-    with t:
-        with t:
-            raise RuntimeError('this should not be reached')
-except AssertionError:
+    t._set_parent(t)
+    raise RuntimeError('this should not be reached')
+except log.OriginLoopError:
     print('disallowed successfully')
     pass
 
diff --git a/selftest/resource_test.ok b/selftest/resource_test.ok
index cdc3519..d366cf9 100644
--- a/selftest/resource_test.ok
+++ b/selftest/resource_test.ok
@@ -13,8 +13,8 @@
 cnf -: DBG: [PATH]/selftest/conf/paths.conf: relative path ./test_work/state_dir is [PATH]/selftest/conf/test_work/state_dir
 cnf -: DBG: [PATH]/selftest/conf/paths.conf: relative path ./suite_test is [PATH]/selftest/conf/suite_test
 cnf -: DBG: Found path state_dir as [PATH]/selftest/conf/test_work/state_dir
-cnf -: DBG: Found config file resources.conf as [PATH]/selftest/conf/resources.conf in ./conf which is [PATH]/selftest/conf
-cnf -: DBG: Found path state_dir as [PATH]/selftest/conf/test_work/state_dir
+cnf ResourcesPool: DBG: Found config file resources.conf as [PATH]/selftest/conf/resources.conf in ./conf which is [PATH]/selftest/conf
+cnf ResourcesPool: DBG: Found path state_dir as [PATH]/selftest/conf/test_work/state_dir
 *** all resources:
 {'arfcn': [{'_hash': 'e620569450f8259b3f0212ec19c285dd07df063c',
             'arfcn': '512',
diff --git a/selftest/resource_test.py b/selftest/resource_test.py
index c78485e..a0ec490 100755
--- a/selftest/resource_test.py
+++ b/selftest/resource_test.py
@@ -78,7 +78,7 @@
        'modem': [ { 'times': 2 } ],
      }
 
-origin = log.Origin('testowner')
+origin = log.Origin(None, 'testowner')
 
 resources = pool.reserve(origin, want)
 
diff --git a/selftest/suite_test.ok b/selftest/suite_test.ok
index 54c950a..2808474 100644
--- a/selftest/suite_test.ok
+++ b/selftest/suite_test.ok
@@ -7,7 +7,7 @@
 - no suite.conf
 cnf -: DBG: Found path suites_dir as [PATH]/selftest/suite_test
 cnf empty_dir: DBG: reading suite.conf
---- [PATH]/selftest/suite_test/empty_dir/suite.conf: ERR: FileNotFoundError: [Errno 2] No such file or directory: '[PATH]/selftest/suite_test/empty_dir/suite.conf'
+cnf [PATH]/selftest/suite_test/empty_dir/suite.conf: ERR: FileNotFoundError: [Errno 2] No such file or directory: '[PATH]/selftest/suite_test/empty_dir/suite.conf'  [empty_dir↪[PATH]/selftest/suite_test/empty_dir/suite.conf]
 - valid suite dir
 cnf -: DBG: Found path suites_dir as [PATH]/selftest/suite_test
 cnf test_suite: DBG: reading suite.conf
@@ -22,15 +22,15 @@
   - times: '2'
 
 - run hello world test
-cnf -: DBG: Found config file resources.conf as [PATH]/selftest/suite_test/resources.conf in ./suite_test which is [PATH]/selftest/suite_test
-cnf -: DBG: Found path state_dir as [PATH]/selftest/suite_test/test_work/state_dir
+cnf ResourcesPool: DBG: Found config file resources.conf as [PATH]/selftest/suite_test/resources.conf in ./suite_test which is [PATH]/selftest/suite_test
+cnf ResourcesPool: DBG: Found path state_dir as [PATH]/selftest/suite_test/test_work/state_dir
 
 ---------------------------------------------------------------------
 trial test_suite
 ---------------------------------------------------------------------
 tst test_suite: reserving resources in [PATH]/selftest/suite_test/test_work/state_dir ...
 tst test_suite: DBG: {combining='resources'}
-tst test_suite: DBG: {definition_conf={bts=[{'times': '1'}], ip_address=[{'times': '1'}], modem=[{'times': '2'}]}}  [test_suite↪(combining_scenarios='resources')↪test_suite]
+tst {combining_scenarios='resources'}: DBG: {definition_conf={bts=[{'times': '1'}], ip_address=[{'times': '1'}], modem=[{'times': '2'}]}}  [test_suite↪{combining_scenarios='resources'}]
 tst test_suite: Reserving 1 x bts (candidates: 3)
 tst test_suite: DBG: Picked - _hash: 07d9c8aaa940b674efcbbabdd69f58a6ce4e94f9
   addr: 10.42.42.114
@@ -83,7 +83,7 @@
 trial test_suite test_error.py
 ----------------------------------------------
 tst test_error.py:[LINENR]: I am 'test_suite' / 'test_error.py:[LINENR]'  [test_suite↪test_error.py:[LINENR]]  [test_error.py:[LINENR]]
-tst test_error.py:[LINENR]: ERR: AssertionError: test_error.py:[LINENR]: assert False [test_error.py:[LINENR]]  [test_suite↪test_error.py:[LINENR]]  [suite.py:[LINENR]]
+tst test_error.py:[LINENR]: ERR: AssertionError: test_error.py:[LINENR]: assert False  [test_suite↪test_error.py:[LINENR]]  [test_error.py:[LINENR]: assert False]
 tst test_error.py:[LINENR]: Test FAILED (N.N sec)  [test_suite↪test_error.py:[LINENR]]  [suite.py:[LINENR]]
 ---------------------------------------------------------------------
 trial test_suite FAIL
@@ -92,7 +92,7 @@
     skip: hello_world.py (N.N sec)
     skip: mo_mt_sms.py
     skip: mo_sms.py
-    FAIL: test_error.py (N.N sec) AssertionError: test_error.py:[LINENR]: assert False [test_error.py:[LINENR]]
+    FAIL: test_error.py (N.N sec) AssertionError: test_error.py:[LINENR]: assert False
     skip: test_fail.py
     skip: test_fail_raise.py
 
@@ -106,7 +106,7 @@
 trial test_suite test_fail.py
 ----------------------------------------------
 tst test_fail.py:[LINENR]: I am 'test_suite' / 'test_fail.py:[LINENR]'  [test_suite↪test_fail.py:[LINENR]]  [test_fail.py:[LINENR]]
-tst test_fail.py:[LINENR]: ERR: EpicFail: This failure is expected  [test_suite↪test_fail.py:[LINENR]]  [suite.py:[LINENR]]
+tst test_fail.py:[LINENR]: ERR: EpicFail: This failure is expected  [test_suite↪test_fail.py:[LINENR]]  [test_fail.py:[LINENR]]
 tst test_fail.py:[LINENR]: Test FAILED (N.N sec)  [test_suite↪test_fail.py:[LINENR]]  [suite.py:[LINENR]]
 ---------------------------------------------------------------------
 trial test_suite FAIL
@@ -128,7 +128,7 @@
 ----------------------------------------------
 trial test_suite test_fail_raise.py
 ----------------------------------------------
-tst test_fail_raise.py:[LINENR]: ERR: ExpectedFail: This failure is expected [test_fail_raise.py:[LINENR]]  [test_suite↪test_fail_raise.py:[LINENR]]  [suite.py:[LINENR]]
+tst test_fail_raise.py:[LINENR]: ERR: ExpectedFail: This failure is expected  [test_suite↪test_fail_raise.py:[LINENR]]  [test_fail_raise.py:[LINENR]: raise ExpectedFail('This failure is expected')]
 tst test_fail_raise.py:[LINENR]: Test FAILED (N.N sec)  [test_suite↪test_fail_raise.py:[LINENR]]  [suite.py:[LINENR]]
 ---------------------------------------------------------------------
 trial test_suite FAIL
@@ -139,6 +139,6 @@
     skip: mo_sms.py
     skip: test_error.py (N.N sec)
     skip: test_fail.py (N.N sec)
-    FAIL: test_fail_raise.py (N.N sec) ExpectedFail: This failure is expected [test_fail_raise.py:[LINENR]]
+    FAIL: test_fail_raise.py (N.N sec) ExpectedFail: This failure is expected
 
 - graceful exit.
diff --git a/selftest/suite_test.py b/selftest/suite_test.py
index 2a92f47..86c4c25 100755
--- a/selftest/suite_test.py
+++ b/selftest/suite_test.py
@@ -20,7 +20,7 @@
 print(config.tostr(s_def.conf))
 
 print('- run hello world test')
-trial = log.Origin('trial')
+trial = log.Origin(log.C_TST, 'trial')
 s = suite.SuiteRun(trial, 'test_suite', s_def)
 results = s.run_tests('hello_world.py')
 print(report.suite_to_text(s))
diff --git a/selftest/template_test.ok b/selftest/template_test.ok
index d031c96..1267dac 100644
--- a/selftest/template_test.ok
+++ b/selftest/template_test.ok
@@ -1,5 +1,5 @@
 - Testing: fill a config file with values
-cnf Templates: DBG: rendering osmo-nitb.cfg.tmpl  [osmo-nitb.cfg.tmpl↪Templates]
+cnf Templates: DBG: rendering osmo-nitb.cfg.tmpl
 ! Configuration rendered by osmo-gsm-tester
 password foo
 !
diff --git a/src/osmo_gsm_tester/bts_osmotrx.py b/src/osmo_gsm_tester/bts_osmotrx.py
index 0083512..7d12c85 100644
--- a/src/osmo_gsm_tester/bts_osmotrx.py
+++ b/src/osmo_gsm_tester/bts_osmotrx.py
@@ -36,10 +36,9 @@
     CONF_BTS_TRX = 'osmo-bts-trx.cfg'
 
     def __init__(self, suite_run, conf):
+        super().__init__(log.C_RUN, OsmoBtsTrx.BIN_BTS_TRX)
         self.suite_run = suite_run
         self.conf = conf
-        self.set_name(OsmoBtsTrx.BIN_BTS_TRX)
-        self.set_log_category(log.C_RUN)
         self.env = {}
 
     def remote_addr(self):
diff --git a/src/osmo_gsm_tester/bts_sysmo.py b/src/osmo_gsm_tester/bts_sysmo.py
index 5f2b3cb..30fff0e 100644
--- a/src/osmo_gsm_tester/bts_sysmo.py
+++ b/src/osmo_gsm_tester/bts_sysmo.py
@@ -35,52 +35,50 @@
     BTS_SYSMO_CFG = 'osmo-bts-sysmo.cfg'
 
     def __init__(self, suite_run, conf):
+        super().__init__(log.C_RUN, self.BTS_SYSMO_BIN)
         self.suite_run = suite_run
         self.conf = conf
-        self.set_name('osmo-bts-sysmo')
-        self.set_log_category(log.C_RUN)
         self.remote_env = {}
         self.remote_user = 'root'
 
     def start(self):
-        with self:
-            if self.bsc is None:
-                raise RuntimeError('BTS needs to be added to a BSC or NITB before it can be started')
-            self.log('Starting sysmoBTS to connect to', self.bsc)
-            self.run_dir = util.Dir(self.suite_run.trial.get_run_dir().new_dir(self.name()))
-            self.configure()
+        if self.bsc is None:
+            raise RuntimeError('BTS needs to be added to a BSC or NITB before it can be started')
+        log.log('Starting sysmoBTS to connect to', self.bsc)
+        self.run_dir = util.Dir(self.suite_run.trial.get_run_dir().new_dir(self.name()))
+        self.configure()
 
-            self.inst = util.Dir(os.path.abspath(self.suite_run.trial.get_inst(SysmoBts.BTS_SYSMO_BIN)))
-            lib = self.inst.child('lib')
-            if not os.path.isdir(lib):
-                self.raise_exn('No lib/ in', self.inst)
-            if not self.inst.isfile('bin', SysmoBts.BTS_SYSMO_BIN):
-                self.raise_exn('No osmo-bts-sysmo binary in', self.inst)
+        self.inst = util.Dir(os.path.abspath(self.suite_run.trial.get_inst(SysmoBts.BTS_SYSMO_BIN)))
+        lib = self.inst.child('lib')
+        if not os.path.isdir(lib):
+            raise log.Error('No lib/ in', self.inst)
+        if not self.inst.isfile('bin', SysmoBts.BTS_SYSMO_BIN):
+            raise log.Error('No osmo-bts-sysmo binary in', self.inst)
 
-            self.remote_dir = util.Dir(SysmoBts.REMOTE_DIR)
-            self.remote_inst = util.Dir(self.remote_dir.child(os.path.basename(str(self.inst))))
+        self.remote_dir = util.Dir(SysmoBts.REMOTE_DIR)
+        self.remote_inst = util.Dir(self.remote_dir.child(os.path.basename(str(self.inst))))
 
-            self.run_remote('rm-remote-dir', ('test', '!', '-d', SysmoBts.REMOTE_DIR, '||', 'rm', '-rf', SysmoBts.REMOTE_DIR))
-            self.run_remote('mk-remote-dir', ('mkdir', '-p', SysmoBts.REMOTE_DIR))
-            self.run_local('scp-inst-to-sysmobts',
-                ('scp', '-r', str(self.inst), '%s@%s:%s' % (self.remote_user, self.remote_addr(), str(self.remote_inst))))
+        self.run_remote('rm-remote-dir', ('test', '!', '-d', SysmoBts.REMOTE_DIR, '||', 'rm', '-rf', SysmoBts.REMOTE_DIR))
+        self.run_remote('mk-remote-dir', ('mkdir', '-p', SysmoBts.REMOTE_DIR))
+        self.run_local('scp-inst-to-sysmobts',
+            ('scp', '-r', str(self.inst), '%s@%s:%s' % (self.remote_user, self.remote_addr(), str(self.remote_inst))))
 
-            remote_run_dir = self.remote_dir.child(SysmoBts.BTS_SYSMO_BIN)
-            self.run_remote('mk-remote-run-dir', ('mkdir', '-p', remote_run_dir))
+        remote_run_dir = self.remote_dir.child(SysmoBts.BTS_SYSMO_BIN)
+        self.run_remote('mk-remote-run-dir', ('mkdir', '-p', remote_run_dir))
 
-            remote_config_file = self.remote_dir.child(SysmoBts.BTS_SYSMO_CFG)
-            self.run_local('scp-cfg-to-sysmobts',
-                ('scp', '-r', self.config_file, '%s@%s:%s' % (self.remote_user, self.remote_addr(), remote_config_file)))
+        remote_config_file = self.remote_dir.child(SysmoBts.BTS_SYSMO_CFG)
+        self.run_local('scp-cfg-to-sysmobts',
+            ('scp', '-r', self.config_file, '%s@%s:%s' % (self.remote_user, self.remote_addr(), remote_config_file)))
 
-            self.run_remote('reload-dsp-firmware', ('/bin/sh', '-c', '"cat /lib/firmware/sysmobts-v?.bit > /dev/fpgadl_par0 ; cat /lib/firmware/sysmobts-v?.out > /dev/dspdl_dm644x_0"'))
+        self.run_remote('reload-dsp-firmware', ('/bin/sh', '-c', '"cat /lib/firmware/sysmobts-v?.bit > /dev/fpgadl_par0 ; cat /lib/firmware/sysmobts-v?.out > /dev/dspdl_dm644x_0"'))
 
-            remote_lib = self.remote_inst.child('lib')
-            remote_binary = self.remote_inst.child('bin', 'osmo-bts-sysmo')
-            self.launch_remote('osmo-bts-sysmo',
-                ('LD_LIBRARY_PATH=%s' % remote_lib,
-                 remote_binary, '-c', remote_config_file, '-r', '1',
-                 '-i', self.bsc.addr()),
-                remote_cwd=remote_run_dir)
+        remote_lib = self.remote_inst.child('lib')
+        remote_binary = self.remote_inst.child('bin', 'osmo-bts-sysmo')
+        self.launch_remote('osmo-bts-sysmo',
+            ('LD_LIBRARY_PATH=%s' % remote_lib,
+             remote_binary, '-c', remote_config_file, '-r', '1',
+             '-i', self.bsc.addr()),
+            remote_cwd=remote_run_dir)
 
     def _process_remote(self, name, popen_args, remote_cwd=None):
         run_dir = self.run_dir.new_dir(name)
@@ -92,7 +90,8 @@
         proc.launch()
         proc.wait()
         if proc.result != 0:
-            proc.raise_exn('Exited in error')
+            log.ctx(proc)
+            raise log.Error('Exited in error')
 
     def launch_remote(self, name, popen_args, remote_cwd=None):
         proc = self._process_remote(name, popen_args, remote_cwd)
@@ -105,7 +104,8 @@
         proc.launch()
         proc.wait()
         if proc.result != 0:
-            proc.raise_exn('Exited in error')
+            log.ctx(proc)
+            raise log.Error('Exited in error')
 
     def remote_addr(self):
         return self.conf.get('addr')
diff --git a/src/osmo_gsm_tester/config.py b/src/osmo_gsm_tester/config.py
index 38d8e2f..20ae83e 100644
--- a/src/osmo_gsm_tester/config.py
+++ b/src/osmo_gsm_tester/config.py
@@ -95,7 +95,7 @@
         real_l = os.path.realpath(l)
         p = os.path.realpath(os.path.join(real_l, basename))
         if os.path.isfile(p):
-            log.dbg(None, log.C_CNF, 'Found config file', basename, 'as', p, 'in', l, 'which is', real_l)
+            log.dbg('Found config file', basename, 'as', p, 'in', l, 'which is', real_l, _category=log.C_CNF)
             return (p, real_l)
     if not fail_if_missing:
         return None, None
@@ -122,7 +122,7 @@
     env_path = os.getenv(env_name)
     if env_path:
         real_env_path = os.path.realpath(env_path)
-        log.dbg(None, log.C_CNF, 'Found path', label, 'as', env_path, 'in', '$' + env_name, 'which is', real_env_path)
+        log.dbg('Found path', label, 'as', env_path, 'in', '$' + env_name, 'which is', real_env_path, _category=log.C_CNF)
         return real_env_path
 
     if PATHS is None:
@@ -132,15 +132,15 @@
         for key, path in sorted(PATHS.items()):
             if not path.startswith(os.pathsep):
                 PATHS[key] = os.path.realpath(os.path.join(found_in, path))
-                log.dbg(None, log.C_CNF, paths_file + ': relative path', path, 'is', PATHS[key])
+                log.dbg(paths_file + ': relative path', path, 'is', PATHS[key], _category=log.C_CNF)
     p = PATHS.get(label)
     if p is None and not allow_unset:
         raise RuntimeError('missing configuration in %s: %r' % (PATHS_CONF, label))
 
-    log.dbg(None, log.C_CNF, 'Found path', label, 'as', p)
+    log.dbg('Found path', label, 'as', p, _category=log.C_CNF)
     if p.startswith(PATHS_TEMPDIR_STR):
         p = os.path.join(get_tempdir(), p[len(PATHS_TEMPDIR_STR):])
-        log.dbg(None, log.C_CNF, 'Path', label, 'contained', PATHS_TEMPDIR_STR, 'and becomes', p)
+        log.dbg('Path', label, 'contained', PATHS_TEMPDIR_STR, 'and becomes', p, _category=log.C_CNF)
     return p
 
 def get_state_dir():
@@ -153,20 +153,20 @@
     return Dir(get_configured_path(PATH_SCENARIOS_DIR))
 
 def read(path, validation_schema=None, if_missing_return=False):
-    with log.Origin(path):
-        if not os.path.isfile(path) and if_missing_return is not False:
-            return if_missing_return
-        with open(path, 'r') as f:
-            config = yaml.safe_load(f)
-        config = _standardize(config)
-        if validation_schema:
-            schema.validate(config, validation_schema)
-        return config
+    log.ctx(path)
+    if not os.path.isfile(path) and if_missing_return is not False:
+        return if_missing_return
+    with open(path, 'r') as f:
+        config = yaml.safe_load(f)
+    config = _standardize(config)
+    if validation_schema:
+        schema.validate(config, validation_schema)
+    return config
 
 def write(path, config):
-    with log.Origin(path):
-        with open(path, 'w') as f:
-            f.write(tostr(config))
+    log.ctx(path)
+    with open(path, 'w') as f:
+        f.write(tostr(config))
 
 def tostr(config):
     return _tostr(_standardize(config))
@@ -191,8 +191,7 @@
 
 class Scenario(log.Origin, dict):
     def __init__(self, name, path):
-        self.set_name(name)
-        self.set_log_category(log.C_TST)
+        super().__init__(log.C_TST, name)
         self.path = path
 
 def get_scenario(name, validation_schema=None):
@@ -216,8 +215,8 @@
             if dest_val is None:
                 dest[key] = val
             else:
-                with log.Origin(key=key):
-                    add(dest_val, val)
+                log.ctx(key=key)
+                add(dest_val, val)
         return
     if is_list(dest):
         if not is_list(src):
@@ -235,19 +234,19 @@
             raise ValueError('cannot combine dict with a value of type: %r' % type(src))
 
         for key, val in src.items():
+            log.ctx(key=key)
             dest_val = dest.get(key)
             if dest_val is None:
                 dest[key] = val
             else:
-                with log.Origin(key=key):
-                    combine(dest_val, val)
+                combine(dest_val, val)
         return
     if is_list(dest):
         if not is_list(src):
             raise ValueError('cannot combine list with a value of type: %r' % type(src))
         for i in range(len(src)):
-            with log.Origin(idx=i):
-                combine(dest[i], src[i])
+            log.ctx(idx=i)
+            combine(dest[i], src[i])
         return
     if dest == src:
         return
@@ -260,16 +259,16 @@
             raise ValueError('cannot combine dict with a value of type: %r' % type(src))
 
         for key, val in src.items():
+            log.ctx(key=key)
             dest_val = dest.get(key)
-            with log.Origin(key=key):
-                dest[key] = overlay(dest_val, val)
+            dest[key] = overlay(dest_val, val)
         return dest
     if is_list(dest):
         if not is_list(src):
             raise ValueError('cannot combine list with a value of type: %r' % type(src))
         for i in range(len(src)):
-            with log.Origin(idx=i):
-                dest[i] = overlay(dest[i], src[i])
+            log.ctx(key=key)
+            dest[i] = overlay(dest[i], src[i])
         return dest
     return src
 
diff --git a/src/osmo_gsm_tester/event_loop.py b/src/osmo_gsm_tester/event_loop.py
index c3c679b..6f64ef9 100644
--- a/src/osmo_gsm_tester/event_loop.py
+++ b/src/osmo_gsm_tester/event_loop.py
@@ -21,6 +21,8 @@
 # A test script can thus establish its context by doing:
 # from osmo_gsm_tester.test import *
 import time
+from . import log
+
 poll_funcs = []
 
 def register_poll_func(func):
@@ -38,7 +40,8 @@
 
 def wait_no_raise(log_obj, condition, condition_args, condition_kwargs, timeout, timestep):
     if not timeout or timeout < 0:
-        log_obj.raise_exn('wait() *must* time out at some point. timeout=%r' % timeout)
+        self = log_obj
+        raise log.Error('wait() *must* time out at some point.', timeout=timeout)
     if timestep < 0.1:
         timestep = 0.1
 
@@ -54,7 +57,8 @@
 
 def wait(log_obj, condition, *condition_args, timeout=300, timestep=1, **condition_kwargs):
     if not wait_no_raise(log_obj, condition, condition_args, condition_kwargs, timeout, timestep):
-        log_obj.raise_exn('Wait timeout')
+        log.ctx(log_obj)
+        raise log.Error('Wait timeout')
 
 def sleep(log_obj, seconds):
     assert seconds > 0.
diff --git a/src/osmo_gsm_tester/log.py b/src/osmo_gsm_tester/log.py
index f098f2b..c4a6629 100644
--- a/src/osmo_gsm_tester/log.py
+++ b/src/osmo_gsm_tester/log.py
@@ -45,6 +45,41 @@
 C_BUS = 'bus'
 C_DEFAULT = '---'
 
+LOG_CTX_VAR = '_log_ctx_'
+
+def dbg(*messages, _origin=None, _category=None, _src=None, **named_items):
+    '''Log on debug level. See also log()'''
+    _log(messages, named_items, origin=_origin, category=_category, level=L_DBG, src=_src)
+
+def log(*messages, _origin=None, _category=None, _level=L_LOG, _src=None, **named_items):
+    '''Log a message. The origin, an Origin class instance, is normally
+    determined by stack magic, only pass _origin to override. The category is
+    taken from the origin. _src is normally an integer indicating how many
+    levels up the stack sits the interesting source file to log about, can also
+    be a string. The log message is composed of all *messages and
+    **named_items, for example:
+      log('frobnicate:', thing, key=current_key, prop=erty)
+    '''
+    _log(messages, named_items, origin=_origin, category=_category, level=_level, src=_src)
+
+def err(*messages, _origin=None, _category=None, _src=None, **named_items):
+    '''Log on error level. See also log()'''
+    _log(messages, named_items, origin=_origin, category=_category, level=L_ERR, src=_src)
+
+def _log(messages=[], named_items={}, origin=None, category=None, level=L_LOG, src=None):
+    if origin is None:
+        origin = Origin.find_on_stack()
+    if category is None and isinstance(origin, Origin):
+        category = origin._log_category
+    if src is None:
+        # two levels up
+        src = 2
+    if isinstance(src, int):
+        src = get_src_from_caller(src + 1)
+    for target in LogTarget.all_targets:
+        target.log(origin, category, level, src, messages, named_items)
+
+
 LONG_DATEFMT = '%Y-%m-%d_%H:%M:%S'
 DATEFMT = '%H:%M:%S'
 
@@ -52,7 +87,8 @@
 get_process_id = lambda: '%d-%d' % (os.getpid(), time.time())
 
 class Error(Exception):
-    pass
+    def __init__(self, *messages, **named_items):
+        super().__init__(compose_message(messages, named_items))
 
 class LogTarget:
     all_targets = []
@@ -153,7 +189,7 @@
 
     def log(self, origin, category, level, src, messages, named_items):
         if category and len(category) != 3:
-            self.log_write_func('WARNING: INVALID LOG SUBSYSTEM %r\n' % category)
+            self.log_write_func('WARNING: INVALID LOGGING CATEGORY %r\n' % category)
             self.log_write_func('origin=%r category=%r level=%r\n' % (origin, category, level));
 
         if not category:
@@ -172,14 +208,13 @@
         if self.do_log_origin:
             if origin is None:
                 name = '-'
-            elif isinstance(origin, Origins):
-                name = origin[-1]
-                if len(origin) > 1:
-                    deeper_origins = str(origin)
+            elif isinstance(origin, Origin):
+                name = origin.name()
+                # only log ancestry when there is more than one
+                if origin._parent is not None:
+                    deeper_origins = origin.ancestry_str()
             elif isinstance(origin, str):
                 name = origin or None
-            elif hasattr(origin, 'name'):
-                name = origin.name()
             if not name:
                 name = str(origin.__class__.__name__)
             log_pre.append(self.origin_fmt.format(name))
@@ -228,7 +263,7 @@
 
 def _log_all_targets(origin, category, level, src, messages, named_items=None):
     if origin is None:
-        origin = Origin._global_current_origin
+        origin = Origin.find_on_stack()
     if isinstance(src, int):
         src = get_src_from_caller(src + 1)
     for target in LogTarget.all_targets:
@@ -242,13 +277,17 @@
     caller = getframeinfo(stack()[levels_up][0])
     return '%s:%d' % (os.path.basename(caller.filename), caller.lineno)
 
-def get_src_from_tb(tb, levels_up=1):
-    ftb = traceback.extract_tb(tb)
+def get_src_from_exc_info(exc_info=None, levels_up=1):
+    if exc_info is None:
+        exc_info = sys.exc_info()
+    ftb = traceback.extract_tb(exc_info[2])
     f,l,m,c = ftb[-levels_up]
     f = os.path.basename(f)
     return '%s:%s: %s' % (f, l, c)
 
 def get_line_for_src(src_path):
+    '''find a given source file on the stack and return the line number for
+    that file. (Used to indicate the position in a test script.)'''
     etype, exception, tb = sys.exc_info()
     if tb:
         ftb = traceback.extract_tb(tb)
@@ -262,31 +301,112 @@
             return caller.lineno
     return None
 
+def ctx(*name_items, **detail_items):
+    '''Store log context in the current frame. This string will appear as
+    origin information for exceptions thrown within the calling scope.'''
+    if not name_items and not detail_items:
+        ctx_obj(None)
+    if not detail_items and len(name_items) == 1 and isinstance(name_items[0], Origin):
+        ctx_obj(name_items[0])
+    else:
+        ctx_obj(compose_message(name_items, detail_items))
+
+def ctx_obj(origin_or_str):
+    f = sys._getframe(2)
+    if origin_or_str is None:
+        f.f_locals.pop(LOG_CTX_VAR, None)
+    else:
+        f.f_locals[LOG_CTX_VAR] = origin_or_str
+
+class OriginLoopError(Error):
+    pass
 
 class Origin:
     '''
-    Base class for all classes that want to log,
-    and to add an origin string to a code path:
-    with log.Origin('my name'):
-        raise Problem()
-    This will log 'my name' as an origin for the Problem.
+    Base class for all classes that want to appear in the log.
+    It is a simple named marker to find in the stack frames.
+    This depends on the object instance named 'self' in each member class.
+
+    In addition, it provides a logging category and a globally unique ID for
+    each instance.
+
+    Each child class *must* call super().__init__(category, name), to allow
+    noting its parent origins.
     '''
 
-    _global_current_origin = None
     _global_id = None
 
-    _log_category = None
-    _src = None
     _name = None
     _origin_id = None
+    _log_category = None
+    _parent = None
 
-    _parent_origin = None
+    @staticmethod
+    def find_on_stack(except_obj=None, f=None):
+        if f is None:
+            f = sys._getframe(2)
+        log_ctx_obj = None
+        origin = None
+        while f is not None:
+            l = f.f_locals
 
-    def __init__(self, *name_items, category=None, **detail_items):
-        self.set_log_category(category)
+            # if there is a log_ctx in the scope, add it, pointing to the next
+            # actual Origin class in the stack
+            log_ctx = l.get(LOG_CTX_VAR)
+            if log_ctx:
+                if isinstance(log_ctx, Origin):
+                    new_log_ctx_obj = log_ctx
+                else:
+                    new_log_ctx_obj = Origin(None, log_ctx, find_parent=False)
+                if log_ctx_obj is None:
+                    log_ctx_obj = new_log_ctx_obj
+                else:
+                    log_ctx_obj.highest_ancestor()._set_parent(new_log_ctx_obj)
+
+            obj = l.get('self')
+            if obj and isinstance(obj, Origin) and (except_obj is not obj):
+                origin = obj
+                break
+            f = f.f_back
+
+        if (origin is not None) and (log_ctx_obj is not None):
+            log_ctx_obj.highest_ancestor()._set_parent(origin)
+            p = log_ctx_obj
+            while p:
+                p._set_log_category(origin._log_category)
+                p = p._parent
+        if log_ctx_obj is not None:
+            return log_ctx_obj
+        # may return None
+        return origin
+
+    @staticmethod
+    def find_in_exc_info(exc_info):
+        tb = exc_info[2]
+        # get last tb ... I hope that's right
+        while tb.tb_next:
+            tb = tb.tb_next
+        return Origin.find_on_stack(f=tb.tb_frame)
+
+    def __init__(self, category, *name_items, find_parent=True, **detail_items):
+        self._set_log_category(category)
         self.set_name(*name_items, **detail_items)
+        if find_parent:
+            self._set_parent(Origin.find_on_stack(except_obj=self))
+
+    def _set_parent(self, parent):
+        # make sure to avoid loops
+        p = parent
+        while p:
+            if p is self:
+                raise OriginLoopError('Origin parent loop')
+            p = p._parent
+        self._parent = parent
 
     def set_name(self, *name_items, **detail_items):
+        '''Change the origin's name for log output; rather use the constructor.
+        This function can be used to change the name in case naming info
+        becomes available only after class creation (like a pid)'''
         if name_items:
             name = '-'.join([str(i) for i in name_items])
         elif not detail_items:
@@ -313,87 +433,43 @@
             self._origin_id = '%s-%s' % (self.name(), Origin._global_id)
         return self._origin_id
 
-    def set_log_category(self, category):
+    def _set_log_category(self, category):
         self._log_category = category
-
-    def _log(self, level, messages, named_items=None, src_levels_up=3, origins=None):
-        src = self._src or src_levels_up
-        origin = origins or self.gather_origins()
-        _log_all_targets(origin, self._log_category, level, src, messages, named_items)
-
-    def dbg(self, *messages, **named_items):
-        self._log(L_DBG, messages, named_items)
-
-    def log(self, *messages, **named_items):
-        self._log(L_LOG, messages, named_items)
-
-    def err(self, *messages, **named_items):
-        self._log(L_ERR, messages, named_items)
-
-    def trace(self, *messages, **named_items):
-        self._log(L_TRACEBACK, messages, named_items)
-
-    def log_exn(self, exc_info=None):
-        log_exn(self, self._log_category, exc_info)
-
-    def __enter__(self):
-        if not self.set_child_of(Origin._global_current_origin):
-            return self
-        Origin._global_current_origin = self
-        return self
-
-    def __exit__(self, *exc_info):
-        rc = None
-        if exc_info[0] is not None:
-            rc = exn_add_info(exc_info, self)
-        Origin._global_current_origin, self._parent_origin = self._parent_origin, None
-        return rc
-
-    def raise_exn(self, *messages, exn_class=Error, **named_items):
-        with self:
-            raise exn_class(compose_message(messages, named_items))
 
     def redirect_stdout(self):
         return contextlib.redirect_stdout(SafeRedirectStdout(self))
 
-    def gather_origins(self):
-        origins = Origins()
-        # this object shall always be seen as the immediate origin of the log message.
-        origins.add(self)
-        # now go through the parents of this object.
-        origin = self._parent_origin
-        # but if this object is "loose" and not set up with cascaded 'with' statements,
-        # take the last seen 'with' statement's object as next parent:
-        if origin is None and Origin._global_current_origin is not None:
-            origin = Origin._global_current_origin
-            # if this object is currently the _global_current_origin, we don't
-            # need to add it twice.
-            if origin is self:
-                origin = origin._parent_origin
-        # whichever we determined to be the parent above, go up through all its
-        # ancestors.
-        while origin is not None:
-            origins.add(origin)
-            origin = origin._parent_origin
+    def ancestry(self):
+        origins = []
+        n = 10
+        origin = self
+        while origin:
+            origins.insert(0, origin)
+            origin = origin._parent
+            n -= 1
+            if n < 0:
+                break
         return origins
 
-    def set_child_of(self, parent_origin):
-        # avoid loops
-        assert self._parent_origin is None
-        assert parent_origin is not self
-        self._parent_origin = parent_origin
-        return True
+    def ancestry_str(self):
+        return '↪'.join([o.name() for o in self.ancestry()])
 
-class LineInfo(Origin):
-    def __init__(self, src_file, *name_items, **detail_items):
-        self.src_file = src_file
-        self.set_name(*name_items, **detail_items)
+    def highest_ancestor(self):
+        if self._parent:
+            return self._parent.highest_ancestor()
+        return self
 
-    def name(self):
-        l = get_line_for_src(self.src_file)
-        if l is not None:
-            return '%s:%s' % (self._name, l)
-        return super().name()
+    def log(self, *messages, _src=3, **named_items):
+        '''same as log.log() but passes this object to skip looking up an origin'''
+        log(*messages, _origin=self, _src=_src, **named_items)
+
+    def dbg(self, *messages, _src=3, **named_items):
+        '''same as log.dbg() but passes this object to skip looking up an origin'''
+        dbg(*messages, _origin=self, _src=_src, **named_items)
+
+    def err(self, *messages, _src=3, **named_items):
+        '''same as log.err() but passes this object to skip looking up an origin'''
+        err(*messages, _origin=self, _src=_src, **named_items)
 
 class SafeRedirectStdout:
     '''
@@ -407,7 +483,7 @@
     _log_line_buf = None
 
     def __init__(self, origin):
-        self._origin = origin
+        self.origin = origin
 
     def write(self, message):
         lines = message.splitlines()
@@ -419,93 +495,34 @@
         if not message.endswith('\n'):
             self._log_line_buf = lines[-1]
             lines = lines[:-1]
-        origins = self._origin.gather_origins()
         for line in lines:
-            self._origin._log(L_LOG, (line,), origins=origins)
+            _log(messages=(line,),
+                 origin=self.origin, level=L_LOG, src=2)
 
     def __getattr__(self, name):
         return sys.__stdout__.__getattribute__(name)
 
-
-def dbg(origin, category, *messages, **named_items):
-    _log_all_targets(origin, category, L_DBG, 2, messages, named_items)
-
-def log(origin, category, *messages, **named_items):
-    _log_all_targets(origin, category, L_LOG, 2, messages, named_items)
-
-def err(origin, category, *messages, **named_items):
-    _log_all_targets(origin, category, L_ERR, 2, messages, named_items)
-
-def trace(origin, category, exc_info):
-    _log_all_targets(origin, category, L_TRACEBACK, None,
-                     traceback.format_exception(*exc_info))
-
-def resolve_category(origin, category):
-    if category is not None:
-        return category
-    if not hasattr(origin, '_log_category'):
-        return None
-    return origin._log_category
-
-def exn_add_info(exc_info, origin, category=None):
-    etype, exception, tb = exc_info
-    if not hasattr(exception, 'origins'):
-        exception.origins = Origins()
-    if not hasattr(exception, 'category'):
-        # only remember the deepest category
-        exception.category = resolve_category(origin, category)
-    if not hasattr(exception, 'src'):
-        exception.src = get_src_from_tb(tb)
-    exception.origins.add(origin)
-    return False
-
-def log_exn(origin=None, category=None, exc_info=None):
-    if not (exc_info is not None and len(exc_info) == 3):
+def trace(exc_info=None, origin=None):
+    if exc_info is None:
         exc_info = sys.exc_info()
-        if not (exc_info is not None and len(exc_info) == 3):
-            raise RuntimeError('invalid call to log_exn() -- no valid exception info')
+    if origin is None:
+        origin = Origin.find_in_exc_info(exc_info)
+    _log(messages=traceback.format_exception(*exc_info),
+         origin=origin, level=L_TRACEBACK)
+
+def log_exn():
+    exc_info = sys.exc_info()
+    origin = Origin.find_in_exc_info(exc_info)
 
     etype, exception, tb = exc_info
-
-    # if there are origins recorded with the Exception, prefer that
-    if hasattr(exception, 'origins'):
-        origin = exception.origins
-
-    # if there is a category recorded with the Exception, prefer that
-    if hasattr(exception, 'category'):
-        category = exception.category
-
     if hasattr(exception, 'msg'):
         msg = exception.msg
     else:
         msg = str(exception)
 
-    if hasattr(exception, 'src'):
-        src = exception.src
-    else:
-        src = 2
-
-    trace(origin, category, exc_info)
-    _log_all_targets(origin, category, L_ERR, src,
-                     ('%s:' % str(etype.__name__), msg))
-
-
-class Origins(list):
-    def __init__(self, origin=None):
-        if origin is not None:
-            self.add(origin)
-
-    def add(self, origin):
-        if hasattr(origin, 'name'):
-            origin_str = origin.name()
-        else:
-            origin_str = repr(origin)
-        if origin_str is None:
-            raise RuntimeError('origin_str is None for %r' % origin)
-        self.insert(0, origin_str)
-
-    def __str__(self):
-        return '↪'.join(self)
+    trace(exc_info, origin=origin)
+    _log(messages=('%s:' % str(etype.__name__), msg),
+         origin=origin, level=L_ERR, src=get_src_from_exc_info(exc_info))
 
 
 def set_all_levels(level):
diff --git a/src/osmo_gsm_tester/ofono_client.py b/src/osmo_gsm_tester/ofono_client.py
index fc9bba4..67659e1 100644
--- a/src/osmo_gsm_tester/ofono_client.py
+++ b/src/osmo_gsm_tester/ofono_client.py
@@ -139,12 +139,14 @@
     Related: https://github.com/LEW21/pydbus/issues/56
     '''
 
+    modem_path = None
+    watch_props_subscription = None
+    _dbus_obj = None
+    interfaces = None
+
     def __init__(self, modem_path):
         self.modem_path = modem_path
-        self.set_name(self.modem_path)
-        self.set_log_category(log.C_BUS)
-        self.watch_props_subscription = None
-        self._dbus_obj = None
+        super().__init__(log.C_BUS, self.modem_path)
         self.interfaces = set()
 
         # A dict listing signal handlers to connect, e.g.
@@ -175,7 +177,7 @@
         try:
             return self.dbus_obj()[interface_name]
         except KeyError:
-            self.raise_exn('Modem interface is not available:', interface_name)
+            raise log.Error('Modem interface is not available:', interface_name)
 
     def signal(self, interface_name, signal):
         return getattr(self.interface(interface_name), signal)
@@ -310,8 +312,7 @@
     def __init__(self, conf):
         self.conf = conf
         self.path = conf.get('path')
-        self.set_name(self.path)
-        self.set_log_category(log.C_TST)
+        super().__init__(log.C_TST, self.path)
         self.sms_received_list = []
         self.dbus = ModemDbusInteraction(self.path)
         self.register_attempts = 0
@@ -371,8 +372,7 @@
     def imsi(self):
         imsi = self.conf.get('imsi')
         if not imsi:
-            with self:
-                raise RuntimeError('No IMSI')
+            raise log.Error('No IMSI')
         return imsi
 
     def ki(self):
diff --git a/src/osmo_gsm_tester/osmo_bsc.py b/src/osmo_gsm_tester/osmo_bsc.py
index 7753395..5447118 100644
--- a/src/osmo_gsm_tester/osmo_bsc.py
+++ b/src/osmo_gsm_tester/osmo_bsc.py
@@ -31,10 +31,9 @@
     bts = None
 
     def __init__(self, suite_run, msc, ip_address):
+        super().__init__(log.C_RUN, 'osmo-bsc_%s' % ip_address.get('addr'))
         self.suite_run = suite_run
         self.ip_address = ip_address
-        self.set_log_category(log.C_RUN)
-        self.set_name('osmo-bsc_%s' % ip_address.get('addr'))
         self.bts = []
         self.msc = msc
 
diff --git a/src/osmo_gsm_tester/osmo_ctrl.py b/src/osmo_gsm_tester/osmo_ctrl.py
index 0b717fa..b5a947f 100644
--- a/src/osmo_gsm_tester/osmo_ctrl.py
+++ b/src/osmo_gsm_tester/osmo_ctrl.py
@@ -29,8 +29,7 @@
 class OsmoCtrl(log.Origin):
 
     def __init__(self, host, port):
-        self.set_name('Ctrl', host=host, port=port)
-        self.set_log_category(log.C_BUS)
+        super().__init__(log.C_BUS, 'Ctrl', host=host, port=port)
         self.host = host
         self.port = port
         self.sck = None
@@ -79,12 +78,10 @@
         self._send(getmsg)
 
     def __enter__(self):
-        super().__enter__()
         self.connect()
         return self
 
     def __exit__(self, *exc_info):
         self.disconnect()
-        super().__exit__(*exc_info)
 
 # vim: expandtab tabstop=4 shiftwidth=4
diff --git a/src/osmo_gsm_tester/osmo_hlr.py b/src/osmo_gsm_tester/osmo_hlr.py
index 3492f06..110faa5 100644
--- a/src/osmo_gsm_tester/osmo_hlr.py
+++ b/src/osmo_gsm_tester/osmo_hlr.py
@@ -32,10 +32,9 @@
     next_subscriber_id = 1
 
     def __init__(self, suite_run, ip_address):
+        super().__init__(log.C_RUN, 'osmo-hlr_%s' % ip_address.get('addr'))
         self.suite_run = suite_run
         self.ip_address = ip_address
-        self.set_log_category(log.C_RUN)
-        self.set_name('osmo-hlr_%s' % ip_address.get('addr'))
         self.bts = []
 
     def start(self):
@@ -47,16 +46,16 @@
 
         binary = inst.child('bin', 'osmo-hlr')
         if not os.path.isfile(binary):
-            self.raise_exn('Binary missing:', binary)
+            raise log.Error('Binary missing:', binary)
         lib = inst.child('lib')
         if not os.path.isdir(lib):
-            self.raise_exn('No lib/ in', inst)
+            raise log.Error('No lib/ in', inst)
 
         # bootstrap an empty hlr.db
         self.db_file = self.run_dir.new_file('hlr.db')
         sql_input = inst.child('share/doc/osmo-hlr/hlr.sql')
         if not os.path.isfile(sql_input):
-            self.raise_exn('hlr.sql missing:', sql_input)
+            raise log.Error('hlr.sql missing:', sql_input)
         self.run_local('create_hlr_db', ('/bin/sh', '-c', 'sqlite3 %r < %r' % (self.db_file, sql_input)))
 
         iface = util.ip_to_iface(self.addr())
@@ -96,13 +95,13 @@
         return not self.process.terminated()
 
     def run_local(self, name, popen_args):
-        with self:
-            run_dir = self.run_dir.new_dir(name)
-            proc = process.Process(name, run_dir, popen_args)
-            proc.launch()
-            proc.wait()
-            if proc.result != 0:
-                proc.raise_exn('Exited in error')
+        run_dir = self.run_dir.new_dir(name)
+        proc = process.Process(name, run_dir, popen_args)
+        proc.launch()
+        proc.wait()
+        if proc.result != 0:
+            log.ctx(proc)
+            raise log.Error('Exited in error')
 
     def run_sql_file(self, name, sql_file):
         self.run_local(name, ('/bin/sh', '-c', 'sqlite3 %r < %r' % (self.db_file, sql_file)))
diff --git a/src/osmo_gsm_tester/osmo_mgcpgw.py b/src/osmo_gsm_tester/osmo_mgcpgw.py
index 3e722fb..b385274 100644
--- a/src/osmo_gsm_tester/osmo_mgcpgw.py
+++ b/src/osmo_gsm_tester/osmo_mgcpgw.py
@@ -30,10 +30,9 @@
     process = None
 
     def __init__(self, suite_run, ip_address, bts_ip):
+        super().__init__(log.C_RUN, 'osmo-mgcpgw_%s' % ip_address.get('addr'))
         self.suite_run = suite_run
         self.ip_address = ip_address
-        self.set_log_category(log.C_RUN)
-        self.set_name('osmo-mgcpgw_%s' % ip_address.get('addr'))
         # hack: so far mgcpgw needs one specific BTS IP.
         self.bts_ip = bts_ip
 
diff --git a/src/osmo_gsm_tester/osmo_msc.py b/src/osmo_gsm_tester/osmo_msc.py
index 3a822f1..443b254 100644
--- a/src/osmo_gsm_tester/osmo_msc.py
+++ b/src/osmo_gsm_tester/osmo_msc.py
@@ -32,10 +32,9 @@
     config = None
 
     def __init__(self, suite_run, hlr, mgcpgw, ip_address):
+        super().__init__(log.C_RUN, 'osmo-msc_%s' % ip_address.get('addr'))
         self.suite_run = suite_run
         self.ip_address = ip_address
-        self.set_log_category(log.C_RUN)
-        self.set_name('osmo-msc_%s' % ip_address.get('addr'))
         self.hlr = hlr
         self.mgcpgw = mgcpgw
 
@@ -100,12 +99,11 @@
 
     def imsi_attached(self, *imsis):
         attached = self.imsi_list_attached()
-        self.dbg('attached:', attached)
+        log.dbg('attached:', attached)
         return all([(imsi in attached) for imsi in imsis])
 
     def imsi_list_attached(self):
-        with self:
-            return OsmoMscCtrl(self).subscriber_list_active()
+        return OsmoMscCtrl(self).subscriber_list_active()
 
     def running(self):
         return not self.process.terminated()
@@ -117,8 +115,7 @@
 
     def __init__(self, msc):
         self.msc = msc
-        self.set_name('CTRL(%s:%d)' % (self.msc.addr(), self.PORT))
-        self.set_child_of(msc)
+        super().__init__(log.C_BUS, 'CTRL(%s:%d)' % (self.msc.addr(), self.PORT))
 
     def ctrl(self):
         return osmo_ctrl.OsmoCtrl(self.msc.addr(), self.PORT)
diff --git a/src/osmo_gsm_tester/osmo_nitb.py b/src/osmo_gsm_tester/osmo_nitb.py
index b4bf247..3104842 100644
--- a/src/osmo_gsm_tester/osmo_nitb.py
+++ b/src/osmo_gsm_tester/osmo_nitb.py
@@ -32,10 +32,9 @@
     bts = None
 
     def __init__(self, suite_run, ip_address):
+        super().__init__(log.C_RUN, 'osmo-nitb_%s' % ip_address.get('addr'))
         self.suite_run = suite_run
         self.ip_address = ip_address
-        self.set_log_category(log.C_RUN)
-        self.set_name('osmo-nitb_%s' % ip_address.get('addr'))
         self.bts = []
 
     def start(self):
@@ -106,8 +105,7 @@
             msisdn = self.suite_run.resources_pool.next_msisdn(modem)
         modem.set_msisdn(msisdn)
         self.log('Add subscriber', msisdn=msisdn, imsi=modem.imsi())
-        with self:
-            OsmoNitbCtrl(self).subscriber_add(modem.imsi(), msisdn, modem.ki())
+        OsmoNitbCtrl(self).subscriber_add(modem.imsi(), msisdn, modem.ki())
 
     def subscriber_attached(self, *modems):
         return self.imsi_attached(*[m.imsi() for m in modems])
@@ -118,8 +116,7 @@
         return all([(imsi in attached) for imsi in imsis])
 
     def imsi_list_attached(self):
-        with self:
-            return OsmoNitbCtrl(self).subscriber_list_active()
+        return OsmoNitbCtrl(self).subscriber_list_active()
 
     def running(self):
         return not self.process.terminated()
@@ -133,8 +130,7 @@
 
     def __init__(self, nitb):
         self.nitb = nitb
-        self.set_name('CTRL(%s:%d)' % (self.nitb.addr(), OsmoNitbCtrl.PORT))
-        self.set_child_of(nitb)
+        super().__init__(log.C_BUS, 'CTRL(%s:%d)' % (self.nitb.addr(), OsmoNitbCtrl.PORT))
 
     def ctrl(self):
         return osmo_ctrl.OsmoCtrl(self.nitb.addr(), OsmoNitbCtrl.PORT)
diff --git a/src/osmo_gsm_tester/pcap_recorder.py b/src/osmo_gsm_tester/pcap_recorder.py
index f3b1e6a..398ec6c 100644
--- a/src/osmo_gsm_tester/pcap_recorder.py
+++ b/src/osmo_gsm_tester/pcap_recorder.py
@@ -27,14 +27,13 @@
 class PcapRecorder(log.Origin):
 
     def __init__(self, suite_run, run_dir, iface=None, filters=''):
-        self.suite_run = suite_run
-        self.run_dir = run_dir
         self.iface = iface
         if not self.iface:
             self.iface = "any"
         self.filters = filters
-        self.set_log_category(log.C_RUN)
-        self.set_name('pcap-recorder_%s' % self.iface)
+        super().__init__(log.C_RUN, 'pcap-recorder_%s' % self.iface, filters=self.filters)
+        self.suite_run = suite_run
+        self.run_dir = run_dir
         self.start()
 
     def start(self):
diff --git a/src/osmo_gsm_tester/process.py b/src/osmo_gsm_tester/process.py
index e5d38f3..d24bf3d 100644
--- a/src/osmo_gsm_tester/process.py
+++ b/src/osmo_gsm_tester/process.py
@@ -33,9 +33,8 @@
     killed = None
 
     def __init__(self, name, run_dir, popen_args, **popen_kwargs):
+        super().__init__(log.C_RUN, name)
         self.name_str = name
-        self.set_name(name)
-        self.set_log_category(log.C_RUN)
         self.run_dir = run_dir
         self.popen_args = popen_args
         self.popen_kwargs = popen_kwargs
@@ -62,23 +61,21 @@
         return f
 
     def launch(self):
-        with self:
+        log.dbg('cd %r; %s %s' % (
+                os.path.abspath(str(self.run_dir)),
+                ' '.join(['%s=%r'%(k,v) for k,v in self.popen_kwargs.get('env', {}).items()]),
+                ' '.join(self.popen_args)))
 
-            self.dbg('cd %r; %s %s' % (
-                    os.path.abspath(str(self.run_dir)),
-                    ' '.join(['%s=%r'%(k,v) for k,v in self.popen_kwargs.get('env', {}).items()]),
-                    ' '.join(self.popen_args)))
-
-            self.process_obj = subprocess.Popen(
-                self.popen_args,
-                stdout=self.make_output_log('stdout'),
-                stderr=self.make_output_log('stderr'),
-                stdin=subprocess.PIPE,
-                shell=False,
-                cwd=self.run_dir.path,
-                **self.popen_kwargs)
-            self.set_name(self.name_str, pid=self.process_obj.pid)
-            self.log('Launched')
+        self.process_obj = subprocess.Popen(
+            self.popen_args,
+            stdout=self.make_output_log('stdout'),
+            stderr=self.make_output_log('stderr'),
+            stdin=subprocess.PIPE,
+            shell=False,
+            cwd=self.run_dir.path,
+            **self.popen_kwargs)
+        self.set_name(self.name_str, pid=self.process_obj.pid)
+        self.log('Launched')
 
     def _poll_termination(self, time_to_wait_for_term=5):
         wait_step = 0.001
diff --git a/src/osmo_gsm_tester/resource.py b/src/osmo_gsm_tester/resource.py
index 7cc32bb..dbfc4e0 100644
--- a/src/osmo_gsm_tester/resource.py
+++ b/src/osmo_gsm_tester/resource.py
@@ -83,7 +83,7 @@
     def __init__(self):
         self.config_path = config.get_config_file(RESOURCES_CONF)
         self.state_dir = config.get_state_dir()
-        self.set_name(conf=self.config_path, state=self.state_dir.path)
+        super().__init__(log.C_CNF, conf=self.config_path, state=self.state_dir.path)
         self.read_conf()
 
     def read_conf(self):
@@ -158,6 +158,7 @@
             return ReservedResources(self, origin, to_be_reserved)
 
     def free(self, origin, to_be_freed):
+        log.ctx(origin)
         with self.state_dir.lock(origin.origin_id()):
             rrfile_path = self.state_dir.mk_parentdir(RESERVED_RESOURCES_FILE)
             reserved = Resources(config.read(rrfile_path, if_missing_return={}))
@@ -202,19 +203,19 @@
 
         with self.state_dir.lock(origin_id):
             msisdn_path = self.state_dir.child(LAST_USED_MSISDN_FILE)
-            with log.Origin(msisdn_path):
-                last_msisdn = '1000'
-                if os.path.exists(msisdn_path):
-                    if not os.path.isfile(msisdn_path):
-                        raise RuntimeError('path should be a file but is not: %r' % msisdn_path)
-                    with open(msisdn_path, 'r') as f:
-                        last_msisdn = f.read().strip()
-                    schema.msisdn(last_msisdn)
+            log.ctx(msisdn_path)
+            last_msisdn = '1000'
+            if os.path.exists(msisdn_path):
+                if not os.path.isfile(msisdn_path):
+                    raise RuntimeError('path should be a file but is not: %r' % msisdn_path)
+                with open(msisdn_path, 'r') as f:
+                    last_msisdn = f.read().strip()
+                schema.msisdn(last_msisdn)
 
-                next_msisdn = util.msisdn_inc(last_msisdn)
-                with open(msisdn_path, 'w') as f:
-                    f.write(next_msisdn)
-                return next_msisdn
+            next_msisdn = util.msisdn_inc(last_msisdn)
+            with open(msisdn_path, 'w') as f:
+                f.write(next_msisdn)
+            return next_msisdn
 
 
 class NoResourceExn(Exception):
diff --git a/src/osmo_gsm_tester/schema.py b/src/osmo_gsm_tester/schema.py
index fb27f32..d652aa7 100644
--- a/src/osmo_gsm_tester/schema.py
+++ b/src/osmo_gsm_tester/schema.py
@@ -124,9 +124,9 @@
                 validate_item(path, list_v, schema)
             return
 
-        with log.Origin(item=path):
-            type_validator = SCHEMA_TYPES.get(want_type)
-            type_validator(value)
+        log.ctx(path)
+        type_validator = SCHEMA_TYPES.get(want_type)
+        type_validator(value)
 
     def nest(parent_path, config, schema):
         if parent_path:
diff --git a/src/osmo_gsm_tester/suite.py b/src/osmo_gsm_tester/suite.py
index 55f81b1..eeaf7df 100644
--- a/src/osmo_gsm_tester/suite.py
+++ b/src/osmo_gsm_tester/suite.py
@@ -49,9 +49,8 @@
 
 
     def __init__(self, suite_dir):
-        self.set_log_category(log.C_CNF)
         self.suite_dir = suite_dir
-        self.set_name(os.path.basename(self.suite_dir))
+        super().__init__(log.C_CNF, os.path.basename(self.suite_dir))
         self.read_conf()
 
     def read_conf(self):
@@ -78,12 +77,10 @@
     FAIL = 'FAIL'
 
     def __init__(self, suite_run, test_basename):
-        self.suite_run = suite_run
         self.basename = test_basename
+        super().__init__(log.C_TST, self.basename)
+        self.suite_run = suite_run
         self.path = os.path.join(self.suite_run.definition.suite_dir, self.basename)
-        super().__init__(self.path)
-        self.set_name(self.basename)
-        self.set_log_category(log.C_TST)
         self.status = Test.UNKNOWN
         self.start_timestamp = 0
         self.duration = 0
@@ -92,16 +89,15 @@
 
     def run(self):
         try:
-            with self:
-                log.large_separator(self.suite_run.trial.name(), self.suite_run.name(), self.name(), sublevel=3)
-                self.status = Test.UNKNOWN
-                self.start_timestamp = time.time()
-                test.setup(self.suite_run, self, ofono_client, sys.modules[__name__], event_loop)
-                with self.redirect_stdout():
-                    util.run_python_file('%s.%s' % (self.suite_run.definition.name(), self.basename),
-                                         self.path)
-                if self.status == Test.UNKNOWN:
-                     self.set_pass()
+            log.large_separator(self.suite_run.trial.name(), self.suite_run.name(), self.name(), sublevel=3)
+            self.status = Test.UNKNOWN
+            self.start_timestamp = time.time()
+            test.setup(self.suite_run, self, ofono_client, sys.modules[__name__], event_loop)
+            with self.redirect_stdout():
+                util.run_python_file('%s.%s' % (self.suite_run.definition.name(), self.basename),
+                                     self.path)
+            if self.status == Test.UNKNOWN:
+                 self.set_pass()
         except Exception as e:
             if hasattr(e, 'msg'):
                 msg = e.msg
@@ -110,14 +106,14 @@
             if isinstance(e, AssertionError):
                 # AssertionError lacks further information on what was
                 # asserted. Find the line where the code asserted:
-                msg += log.get_src_from_tb(sys.exc_info()[2])
+                msg += log.get_src_from_exc_info(sys.exc_info())
             # add source file information to failure report
             if hasattr(e, 'origins'):
                 msg += ' [%s]' % e.origins
             tb_str = traceback.format_exc()
             if isinstance(e, resource.NoResourceExn):
                 tb_str += self.suite_run.resource_status_str()
-            self.set_fail(type(e).__name__, msg, tb_str)
+            self.set_fail(type(e).__name__, msg, tb_str, log.get_src_from_exc_info())
         except BaseException as e:
             # when the program is aborted by a signal (like Ctrl-C), escalate to abort all.
             self.err('TEST RUN ABORTED: %s' % type(e).__name__)
@@ -129,7 +125,7 @@
             return '%s:%s' % (self._name, l)
         return super().name()
 
-    def set_fail(self, fail_type, fail_message, tb_str=None):
+    def set_fail(self, fail_type, fail_message, tb_str=None, src=4):
         self.status = Test.FAIL
         self.duration = time.time() - self.start_timestamp
         self.fail_type = fail_type
@@ -140,9 +136,9 @@
             tb_str = ''.join(traceback.format_stack()[:-1])
 
         self.fail_tb = tb_str
-        self.err('%s: %s' % (self.fail_type, self.fail_message))
+        self.err('%s: %s' % (self.fail_type, self.fail_message), _src=src)
         if self.fail_tb:
-            self.trace(self.fail_tb)
+            self.log(self.fail_tb, _level=log.L_TRACEBACK)
         self.log('Test FAILED (%.1f sec)' % self.duration)
 
     def set_pass(self):
@@ -171,11 +167,10 @@
     _processes = None
 
     def __init__(self, trial, suite_scenario_str, suite_definition, scenarios=[]):
+        super().__init__(log.C_TST, suite_scenario_str)
         self.trial = trial
         self.definition = suite_definition
         self.scenarios = scenarios
-        self.set_name(suite_scenario_str)
-        self.set_log_category(log.C_TST)
         self.resources_pool = resource.ResourcesPool()
         self.status = SuiteRun.UNKNOWN
         self.load_tests()
@@ -201,18 +196,18 @@
         self.status = SuiteRun.UNKNOWN
 
     def combined(self, conf_name):
-        self.dbg(combining=conf_name)
-        with log.Origin(combining_scenarios=conf_name):
-            combination = copy.deepcopy(self.definition.conf.get(conf_name) or {})
-            self.dbg(definition_conf=combination)
-            for scenario in self.scenarios:
-                with scenario:
-                    c = scenario.get(conf_name)
-                    self.dbg(scenario=scenario.name(), conf=c)
-                    if c is None:
-                        continue
-                    config.combine(combination, c)
-            return combination
+        log.dbg(combining=conf_name)
+        log.ctx(combining_scenarios=conf_name)
+        combination = copy.deepcopy(self.definition.conf.get(conf_name) or {})
+        log.dbg(definition_conf=combination)
+        for scenario in self.scenarios:
+            log.ctx(combining_scenarios=conf_name, scenario=scenario.name())
+            c = scenario.get(conf_name)
+            log.dbg(scenario=scenario.name(), conf=c)
+            if c is None:
+                continue
+            config.combine(combination, c)
+        return combination
 
     def resource_requirements(self):
         if self._resource_requirements is None:
@@ -232,19 +227,18 @@
 
     def run_tests(self, names=None):
         try:
-            with self:
-                log.large_separator(self.trial.name(), self.name(), sublevel=2)
-                self.mark_start()
-                event_loop.register_poll_func(self.poll)
-                if not self.reserved_resources:
-                    self.reserve_resources()
-                for test in self.tests:
-                    if names and not test.name() in names:
-                        test.set_skip()
-                        continue
-                    test.run()
+            log.large_separator(self.trial.name(), self.name(), sublevel=2)
+            self.mark_start()
+            event_loop.register_poll_func(self.poll)
+            if not self.reserved_resources:
+                self.reserve_resources()
+            for test in self.tests:
+                if names and not test.name() in names:
+                    test.set_skip()
+                    continue
+                test.run()
         except Exception:
-            self.log_exn()
+            log.log_exn()
         except BaseException as e:
             # when the program is aborted by a signal (like Ctrl-C), escalate to abort all.
             self.err('SUITE RUN ABORTED: %s' % type(e).__name__)
@@ -355,7 +349,8 @@
                 if process.terminated():
                     process.log_stdout_tail()
                     process.log_stderr_tail()
-                    process.raise_exn('Process ended prematurely')
+                    log.ctx(process)
+                    raise log.Error('Process ended prematurely')
 
     def prompt(self, *msgs, **msg_details):
         'ask for user interaction. Do not use in tests that should run automatically!'
diff --git a/src/osmo_gsm_tester/template.py b/src/osmo_gsm_tester/template.py
index 33ce2f6..0ddfc84 100644
--- a/src/osmo_gsm_tester/template.py
+++ b/src/osmo_gsm_tester/template.py
@@ -26,7 +26,7 @@
 from .util import dict2obj
 
 _lookup = None
-_logger = log.Origin('no templates dir set')
+_logger = log.Origin(log.C_CNF, 'no templates dir set')
 
 def set_templates_dir(*templates_dirs):
     global _lookup
@@ -39,7 +39,7 @@
             raise RuntimeError('templates dir is not a dir: %r'
                                % os.path.abspath(d))
     _lookup = TemplateLookup(directories=templates_dirs)
-    _logger = log.Origin('Templates', category=log.C_CNF)
+    _logger = log.Origin(log.C_CNF, 'Templates')
 
 def render(name, values):
     '''feed values dict into template and return rendered result.
@@ -48,11 +48,11 @@
     if _lookup is None:
         set_templates_dir()
     tmpl_name = name + '.tmpl'
-    with log.Origin(tmpl_name):
-        template = _lookup.get_template(tmpl_name)
-        _logger.dbg('rendering', tmpl_name)
+    log.ctx(tmpl_name)
+    template = _lookup.get_template(tmpl_name)
+    _logger.dbg('rendering', tmpl_name)
 
-        line_info_name = tmpl_name.replace('-', '_').replace('.', '_')
-        return template.render(**dict2obj(values))
+    line_info_name = tmpl_name.replace('-', '_').replace('.', '_')
+    return template.render(**dict2obj(values))
 
 # vim: expandtab tabstop=4 shiftwidth=4
diff --git a/src/osmo_gsm_tester/trial.py b/src/osmo_gsm_tester/trial.py
index 741f3a7..d54e96c 100644
--- a/src/osmo_gsm_tester/trial.py
+++ b/src/osmo_gsm_tester/trial.py
@@ -57,8 +57,7 @@
 
     def __init__(self, trial_dir):
         self.path = os.path.abspath(trial_dir)
-        self.set_name(os.path.basename(self.path))
-        self.set_log_category(log.C_TST)
+        super().__init__(log.C_TST, os.path.basename(self.path))
         self.dir = util.Dir(self.path)
         self.inst_dir = util.Dir(self.dir.child('inst'))
         self.bin_tars = []
@@ -69,7 +68,8 @@
         return self.name()
 
     def __enter__(self):
-        # add a log target to log to the run dir
+        '''add a log target to log to the run dir, write taken marker, log a
+        starting separator.'''
         run_dir = self.get_run_dir()
         detailed_log = run_dir.new_child(FILE_LOG)
         self.log_targets = [
@@ -82,11 +82,10 @@
         log.large_separator(self.name(), sublevel=1)
         self.log('Detailed log at', detailed_log)
         self.take()
-        super().__enter__()
         return self
 
     def __exit__(self, *exc_info):
-        super().__exit__(*exc_info)
+        '''log a report, then remove log file targets for this trial'''
         self.log_report()
         for lt in self.log_targets:
             lt.remove()
@@ -195,6 +194,8 @@
                 except BaseException as e:
                     # when the program is aborted by a signal (like Ctrl-C), escalate to abort all.
                     self.err('TRIAL RUN ABORTED: %s' % type(e).__name__)
+                    # log the traceback before the trial's logging is ended
+                    log.log_exn()
                     raise
                 finally:
                     if suite_run.status != suite.SuiteRun.PASS:

-- 
To view, visit https://gerrit.osmocom.org/2886
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Gerrit-MessageType: merged
Gerrit-Change-Id: I5f9b53150f2bb6fa9d63ce27f0806f0ca6a45e90
Gerrit-PatchSet: 4
Gerrit-Project: osmo-gsm-tester
Gerrit-Branch: master
Gerrit-Owner: Neels Hofmeyr <nhofmeyr at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Neels Hofmeyr <nhofmeyr at sysmocom.de>
Gerrit-Reviewer: Pau Espin Pedrol <pespin at sysmocom.de>



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