kselftest/runner.sh: Propagate SIGTERM to runner child

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/[email protected]/
Fixes: 651e0d881461 ("kselftest/runner: allow to properly deliver signals to tests")
Signed-off-by: Björn Töpel <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

diff --git a/tools/testing/selftests/kselftest/runner.sh b/tools/testing/selftests/kselftest/runner.sh
index 1c952d1401d46bd8f69534330c8edd6915646b3d..70e0a465e30da89834ffa573936949059eec65f2 100644 (file)
--- 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