linux-kernel - [PATCH 5.16 037/227] kselftest: signal all child processes

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Message-Id: <20220221084936.096976076@linuxfoundation.org>
Date:   Mon, 21 Feb 2022 09:47:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, yang xu <xuyang2018.jy@...fujitsu.com>,
        Li Zhijian <lizhijian@...fujitsu.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.16 037/227] kselftest: signal all child processes

From: Li Zhijian <lizhijian@...fujitsu.com>

[ Upstream commit 92d25637a3a45904292c93f1863c6bbda4e3e38f ]

We have some many cases that will create child process as well, such as
pidfd_wait. Previously, we will signal/kill the parent process when it
is time out, but this signal will not be sent to its child process. In
such case, if child process doesn't terminate itself, ksefltest framework
will hang forever.

Here we group all its child processes so that kill() can signal all of
them in timeout.

Fixed change log: Shuah Khan <skhan@...uxfoundation.org>

Suggested-by: yang xu <xuyang2018.jy@...fujitsu.com>
Signed-off-by: Li Zhijian <lizhijian@...fujitsu.com>
Acked-by: Christian Brauner <christian.brauner@...ntu.com>
Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/kselftest_harness.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
index 79a182cfa43ad..78e59620d28de 100644
--- a/tools/testing/selftests/kselftest_harness.h
+++ b/tools/testing/selftests/kselftest_harness.h
@@ -875,7 +875,8 @@ static void __timeout_handler(int sig, siginfo_t *info, void *ucontext)
 	}
 
 	t->timed_out = true;
-	kill(t->pid, SIGKILL);
+	// signal process group
+	kill(-(t->pid), SIGKILL);
 }
 
 void __wait_for_test(struct __test_metadata *t)
@@ -985,6 +986,7 @@ void __run_test(struct __fixture_metadata *f,
 		ksft_print_msg("ERROR SPAWNING TEST CHILD\n");
 		t->passed = 0;
 	} else if (t->pid == 0) {
+		setpgrp();
 		t->fn(t, variant);
 		if (t->skip)
 			_exit(255);
-- 
2.34.1