netdev - [PATCH bpf] selftests: bpf: fix test_tc

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Message-Id: <60919291657a9ee89c708d8aababc28ebe1420be.1573821780.git.jbenc@redhat.com>
Date:   Fri, 15 Nov 2019 13:43:23 +0100
From:   Jiri Benc <jbenc@...hat.com>
To:     bpf@...r.kernel.org, netdev@...r.kernel.org
Cc:     Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH bpf] selftests: bpf: fix test_tc_tunnel hanging

When run_kselftests.sh is run, it hangs after test_tc_tunnel.sh. The reason
is test_tc_tunnel.sh ensures the server ('nc -l') is run all the time,
starting it again every time it is expected to terminate. The exception is
the final client_connect: the server is not started anymore, which ensures
no process is kept running after the test is finished.

For a sit test, though, the script is terminated prematurely without the
final client_connect and the 'nc' process keeps running. This in turn causes
the run_one function in kselftest/runner.sh to hang forever, waiting for the
runaway process to finish.

Ensure a remaining server is terminated on cleanup.

Fixes: f6ad6accaa9d ("selftests/bpf: expand test_tc_tunnel with SIT encap")
Cc: Willem de Bruijn <willemb@...gle.com>
Signed-off-by: Jiri Benc <jbenc@...hat.com>
---
 tools/testing/selftests/bpf/test_tc_tunnel.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/bpf/test_tc_tunnel.sh b/tools/testing/selftests/bpf/test_tc_tunnel.sh
index ff0d31d38061..7c76b841b17b 100755
--- a/tools/testing/selftests/bpf/test_tc_tunnel.sh
+++ b/tools/testing/selftests/bpf/test_tc_tunnel.sh
@@ -62,6 +62,10 @@ cleanup() {
 	if [[ -f "${infile}" ]]; then
 		rm "${infile}"
 	fi
+
+	if [[ -n $server_pid ]]; then
+		kill $server_pid 2> /dev/null
+	fi
 }

 server_listen() {
@@ -77,6 +81,7 @@ client_connect() {

 verify_data() {
 	wait "${server_pid}"
+	server_pid=
 	# sha1sum returns two fields [sha1] [filepath]
 	# convert to bash array and access first elem
 	insum=($(sha1sum ${infile}))
-- 
2.18.1