linux-kernel - [PATCH] kselftest/runner.sh: Propagate SIGTERM to runner child

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Message-Id: <20230705115317.753182-1-bjorn@kernel.org>
Date:   Wed,  5 Jul 2023 13:53:17 +0200
From:   Björn Töpel <bjorn@...nel.org>
To:     Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Björn Töpel <bjorn@...osinc.com>,
        Andrea Righi <andrea.righi@...onical.com>,
        Kees Cook <keescook@...omium.org>,
        Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>,
        netdev@...r.kernel.org
Subject: [PATCH] kselftest/runner.sh: Propagate SIGTERM to runner child

From: Björn Töpel <bjorn@...osinc.com>

Timeouts in kselftest are done using the "timeout" command with the
"--foreground" option. Without the "foreground" option, it is not
possible for a user to cancel the runner using SIGINT, because the
signal is not propagated to timeout which is running in a different
process group. The "forground" options places the timeout in the same
process group as its parent, but only sends the SIGTERM (on timeout)
signal to the forked process. Unfortunately, this does not play nice
with all kselftests, e.g. "net:fcnal-test.sh", where the child
processes will linger because timeout does not send SIGTERM to the
group.

Some users have noted these hangs [1].

Fix this by nesting the timeout with an additional timeout without the
foreground option.

Link: https://lore.kernel.org/all/7650b2eb-0aee-a2b0-2e64-c9bc63210f67@alu.unizg.hr/ # [1]
Fixes: 651e0d881461 ("kselftest/runner: allow to properly deliver signals to tests")
Signed-off-by: Björn Töpel <bjorn@...osinc.com>
---
 tools/testing/selftests/kselftest/runner.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kselftest/runner.sh b/tools/testing/selftests/kselftest/runner.sh
index 1c952d1401d4..70e0a465e30d 100644
--- a/tools/testing/selftests/kselftest/runner.sh
+++ b/tools/testing/selftests/kselftest/runner.sh
@@ -36,7 +36,8 @@ tap_timeout()
 {
 	# Make sure tests will time out if utility is available.
 	if [ -x /usr/bin/timeout ] ; then
-		/usr/bin/timeout --foreground "$kselftest_timeout" $1
+		/usr/bin/timeout --foreground "$kselftest_timeout" \
+			/usr/bin/timeout "$kselftest_timeout" $1
 	else
 		$1
 	fi

base-commit: d528014517f2b0531862c02865b9d4c908019dc4
-- 
2.39.2