test/iscsi_tgt: run vpp with gdb

Change-Id: Ibffdc0d198451d7ef891b4062205c5e0eaf79bee
Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/457471
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>

test/iscsi_tgt/common.sh

@@ -102,6 +102,24 @@ function iscsitestfini() {
 	fi
 }
 
+function gdb_attach() {
+	gdb -q --batch \
+		-ex 'handle SIGHUP nostop pass' \
+		-ex 'handle SIGQUIT nostop pass' \
+		-ex 'handle SIGPIPE nostop pass' \
+		-ex 'handle SIGALRM nostop pass' \
+		-ex 'handle SIGTERM nostop pass' \
+		-ex 'handle SIGUSR1 nostop pass' \
+		-ex 'handle SIGUSR2 nostop pass' \
+		-ex 'handle SIGCHLD nostop pass' \
+		-ex 'set print thread-events off' \
+		-ex 'cont' \
+		-ex 'thread apply all bt' \
+		-ex 'quit' \
+		--tty=/dev/stdout \
+		-p $1
+}
+
 function start_vpp() {
 	# We need to make sure that posix side doesn't send jumbo packets while
 	# for VPP side maximal size of MTU for TCP is 1460 and tests doesn't work
@@ -125,6 +143,8 @@ function start_vpp() {
 	vpp_pid=$!
 	echo "VPP Process pid: $vpp_pid"
 
+	gdb_attach $vpp_pid &
+
 	# Wait until VPP starts responding
 	xtrace_disable
 	counter=40