linux-kernel - [PATCH net] selftests: net: lib: kill PIDs before del netns

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Message-Id: <20240813-upstream-net-20240813-selftests-net-lib-kill-v1-1-27b689b248b8@kernel.org>
Date: Tue, 13 Aug 2024 15:39:34 +0200
From: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
To: mptcp@...ts.linux.dev, "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>, 
 Hangbin Liu <liuhangbin@...il.com>, Petr Machata <petrm@...dia.com>
Cc: netdev@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Mat Martineau <martineau@...nel.org>, 
 "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
Subject: [PATCH net] selftests: net: lib: kill PIDs before del netns

When deleting netns, it is possible to still have some tasks running,
e.g. background tasks like tcpdump running in the background, not
stopped because the test has been interrupted.

Before deleting the netns, it is then safer to kill all attached PIDs,
if any. That should reduce some noises after the end of some tests, and
help with the debugging of some issues. That's why this modification is
seen as a "fix".

Fixes: 25ae948b4478 ("selftests/net: add lib.sh")
Acked-by: Mat Martineau <martineau@...nel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
---
 tools/testing/selftests/net/lib.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/net/lib.sh b/tools/testing/selftests/net/lib.sh
index d0219032f773..8ee4489238ca 100644
--- a/tools/testing/selftests/net/lib.sh
+++ b/tools/testing/selftests/net/lib.sh
@@ -146,6 +146,7 @@ cleanup_ns()

 	for ns in "$@"; do
 		[ -z "${ns}" ] && continue
+		ip netns pids "${ns}" 2> /dev/null | xargs -r kill || true
 		ip netns delete "${ns}" &> /dev/null || true
 		if ! busywait $BUSYWAIT_TIMEOUT ip netns list \| grep -vq "^$ns$" &> /dev/null; then
 			echo "Warn: Failed to remove namespace $ns"

---
base-commit: 58a63729c957621f1990c3494c702711188ca347
change-id: 20240813-upstream-net-20240813-selftests-net-lib-kill-f7964a3a58fe

Best regards,
-- 
Matthieu Baerts (NGI0) <matttbe@...nel.org>