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testenv: qemu: get coredump and show backtrace

Related: OS#6600
Change-Id: Ia08ac58c43388b5ea4d3712c5ef83f54b538b10a
---
M _testenv/data/scripts/qemu/qemu_functions.sh
M _testenv/data/scripts/qemu/qemu_init.sh
2 files changed, 21 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/03/38503/1

diff --git a/_testenv/data/scripts/qemu/qemu_functions.sh b/_testenv/data/scripts/qemu/qemu_functions.sh
index c0dd8cc..e2014a1 100755
--- a/_testenv/data/scripts/qemu/qemu_functions.sh
+++ b/_testenv/data/scripts/qemu/qemu_functions.sh
@@ -1,5 +1,6 @@
 #!/bin/sh -ex
 INITRD_DIR="$PWD/_initrd"
+CORE_DIR="$PWD/_coredump"
 
 # Add one or more files to the initramfs, with parent directories.
 # usr-merge: resolve symlinks for /lib -> /usr/lib etc. so "cp --parents" does
@@ -171,6 +172,8 @@
 		machine_arg="-machine pc"
 	fi
 
+	mkdir -p "$CORE_DIR"
+
 	# sudo is required to set up networking in qemu_ifup.sh
 	# </dev/null to deatch stdin, so qemu doesn't capture ^C
 	sudo sh -c "
@@ -186,6 +189,13 @@
 			-serial stdio \
 			-netdev 'tap,id=nettest,script=$TESTENV_QEMU_SCRIPTS/qemu_ifup.sh' \
 			-device 'virtio-net-pci,netdev=nettest,mac=$(qemu_random_mac)' \
+			-virtfs 'local,path=$CORE_DIR,mount_tag=coredir,security_model=passthrough,fmode=666,writeout=immediate' \
 		</dev/null
 	"
+
+	# Show coredump backtrace
+	if [ -e "$CORE_DIR/coredump" ]; then
+		execfn="$(file "$CORE_DIR/coredump" | grep -o "execfn: '.*'" | cut -d "'" -f 2)"
+		gdb --batch "$execfn" "$CORE_DIR/coredump" -ex bt
+	fi
 }
diff --git a/_testenv/data/scripts/qemu/qemu_init.sh b/_testenv/data/scripts/qemu/qemu_init.sh
index 1c8b39b..1c100f8 100755
--- a/_testenv/data/scripts/qemu/qemu_init.sh
+++ b/_testenv/data/scripts/qemu/qemu_init.sh
@@ -1,6 +1,7 @@
 #!/bin/busybox sh
 echo "Running initrd-init.sh"
 set -ex
+COREDUMP=/tmp/coredump
 
 export HOME=/root
 export LD_LIBRARY_PATH=/usr/local/lib
@@ -27,10 +28,20 @@
 ip link set lo up
 ip link set eth0 up
 
+sysctl -w kernel.core_pattern="$COREDUMP"
+ulimit -c unlimited
+
 echo "KERNEL_TEST_VM_IS_READY"
 
 # Use '|| true' to avoid "attempting to kill init" kernel panic on failure
 /cmd.sh || true
 
+if [ -e "$COREDUMP" ]; then
+	mkdir -p /mnt/coredir
+	mount -t 9p -o trans=virtio coredir /mnt/coredir -oversion=9p2000.L
+	chmod 666 "$COREDUMP"
+	cp "$COREDUMP" /mnt/coredir
+fi
+
 # Avoid kernel panic when init exits
 poweroff -f

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