Change in osmo-sgsn[master]: sgsn: generate coredump and exit upon SIGABRT received

[laforge]

laforge has submitted this change. ( https://gerrit.osmocom.org/c/osmo-sgsn/+/21345 )

Change subject: sgsn: generate coredump and exit upon SIGABRT received
......................................................................

sgsn: generate coredump and exit upon SIGABRT received

Previous code relied on abort() switching sigaction to SIG_FDL +
retriggering SIGABRT in case the signal handler returns, which would
then generate the coredump + terminate the process.
However, if a SIGABRT is received from somewhere else (kill -SIGABRT),
then the process would print the talloc report and continue running,
which is not desired.

Change-Id: I65f70a53b6982bff9ea4bd6ff786d8a2f8181eac
Fixes: OS#4865
---
M src/sgsn/sgsn_main.c
1 file changed, 14 insertions(+), 5 deletions(-)

Approvals:
  Jenkins Builder: Verified
  laforge: Looks good to me, approved



diff --git a/src/sgsn/sgsn_main.c b/src/sgsn/sgsn_main.c
index 1eccad8..e51336b 100644
--- a/src/sgsn/sgsn_main.c
+++ b/src/sgsn/sgsn_main.c
@@ -143,11 +143,11 @@
 	return 0;
 }
 
-static void signal_handler(int signal)
+static void signal_handler(int signum)
 {
-	fprintf(stdout, "signal %u received\n", signal);
+	fprintf(stdout, "signal %u received\n", signum);
 
-	switch (signal) {
+	switch (signum) {
 	case SIGINT:
 	case SIGTERM:
 		osmo_signal_dispatch(SS_L_GLOBAL, S_L_GLOBAL_SHUTDOWN, NULL);
@@ -155,8 +155,17 @@
 		exit(0);
 		break;
 	case SIGABRT:
-		/* in case of abort, we want to obtain a talloc report
-		 * and then return to the caller, who will abort the process */
+		/* in case of abort, we want to obtain a talloc report and
+		 * then run default SIGABRT handler, who will generate coredump
+		 * and abort the process. abort() should do this for us after we
+		 * return, but program wouldn't exit if an external SIGABRT is
+		 * received.
+		 */
+		talloc_report(tall_vty_ctx, stderr);
+		talloc_report_full(tall_sgsn_ctx, stderr);
+		signal(SIGABRT, SIG_DFL);
+		raise(SIGABRT);
+		break;
 	case SIGUSR1:
 		talloc_report(tall_vty_ctx, stderr);
 		talloc_report_full(tall_sgsn_ctx, stderr);

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Gerrit-Project: osmo-sgsn
Gerrit-Branch: master
Gerrit-Change-Id: I65f70a53b6982bff9ea4bd6ff786d8a2f8181eac
Gerrit-Change-Number: 21345
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <pespin at sysmocom.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-MessageType: merged
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