[LTP] [PATCH] open_posix/pthread_sigmask/18-1: Fix race condition in signal thread join

[LTP] [PATCH] open_posix/pthread_sigmask/18-1: Fix race condition in signal thread join

[Wenbo Ma]

When WITH_SYNCHRO is defined, the signal sender threads (th_sig1 and
th_sig2) may block on sem_wait() after the main loop exits. This causes
pthread_join() to hang indefinitely since those threads never wake up.

Post to both semaphores before joining to ensure the signal threads
can proceed and exit cleanly.

Signed-off-by: Wenbo Ma <wenbo1.ma@intel.com>
---
 .../conformance/interfaces/pthread_sigmask/18-1.c            | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/testcases/open_posix_testsuite/conformance/interfaces/pthread_sigmask/18-1.c b/testcases/open_posix_testsuite/conformance/interfaces/pthread_sigmask/18-1.c
index f303e9854..e4606813e 100644
--- a/testcases/open_posix_testsuite/conformance/interfaces/pthread_sigmask/18-1.c
+++ b/testcases/open_posix_testsuite/conformance/interfaces/pthread_sigmask/18-1.c
@@ -293,6 +293,11 @@ int main(void)
 	}
 	while (do_it);
 
+#ifdef WITH_SYNCHRO
+	sem_post(&semsig1);
+	sem_post(&semsig2);
+#endif
+
 	if ((ret = pthread_join(th_sig1, NULL))) {
 		UNRESOLVED(ret, "Signal 1 sender thread join failed");
 	}
-- 
2.34.1


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Re: [LTP] open_posix/pthread_sigmask/18-1: Fix race condition in signal thread join

[linuxtestproject.agent]

Hi Wenbo,

On Mon, Jun 15, 2026 at 09:29:11AM +0800, Wenbo Ma wrote:
> open_posix/pthread_sigmask/18-1: Fix race condition in signal thread join

Verdict - Reviewed

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Note:

The agent can sometimes produce false positives although often its
findings are genuine. If you find issues with the review, please
comment this email or ignore the suggestions.

Regards,
LTP AI Reviewer

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Re: [LTP] [PATCH] open_posix/pthread_sigmask/18-1: Fix race condition in signal thread join

[Andrea Cervesato via ltp]

Reviewed-by: Andrea Cervesato <andrea.cervesato@suse.com>

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Andrea Cervesato
SUSE QE Automation Engineer Linux
andrea.cervesato@suse.com

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