linux-kernel - [PATCH 2/2] selftests/mm: fix deadlock for fork after pthread

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Message-ID: <20241003211716.371786-3-edliaw@google.com>
Date: Thu,  3 Oct 2024 21:17:11 +0000
From: Edward Liaw <edliaw@...gle.com>
To: linux-kselftest@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, 
	Shuah Khan <shuah@...nel.org>, Lokesh Gidra <lokeshgidra@...gle.com>, 
	Edward Liaw <edliaw@...gle.com>, Peter Xu <peterx@...hat.com>
Cc: linux-kernel@...r.kernel.org, kernel-team@...roid.com, linux-mm@...ck.org
Subject: [PATCH 2/2] selftests/mm: fix deadlock for fork after pthread_create
 on ARM

On Android with arm, there is some synchronization needed to avoid a
deadlock when forking after pthread_create.

Fixes: cff294582798 ("selftests/mm: extend and rename uffd pagemap test")
Signed-off-by: Edward Liaw <edliaw@...gle.com>
---
 tools/testing/selftests/mm/uffd-unit-tests.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c
index 3db2296ac631..c8a3b1c7edff 100644
--- a/tools/testing/selftests/mm/uffd-unit-tests.c
+++ b/tools/testing/selftests/mm/uffd-unit-tests.c
@@ -241,6 +241,9 @@ static void *fork_event_consumer(void *data)
 	fork_event_args *args = data;
 	struct uffd_msg msg = { 0 };
 
+	/* Ready for parent thread to fork */
+	pthread_barrier_wait(&ready_for_fork);
+
 	/* Read until a full msg received */
 	while (uffd_read_msg(args->parent_uffd, &msg));
 
@@ -308,8 +311,12 @@ static int pagemap_test_fork(int uffd, bool with_event, bool test_pin)
 
 	/* Prepare a thread to resolve EVENT_FORK */
 	if (with_event) {
+		pthread_barrier_init(&ready_for_fork, NULL, 2);
 		if (pthread_create(&thread, NULL, fork_event_consumer, &args))
 			err("pthread_create()");
+		/* Wait for child thread to start before forking */
+		pthread_barrier_wait(&ready_for_fork);
+		pthread_barrier_destroy(&ready_for_fork);
 	}
 
 	child = fork();
-- 
2.46.1.824.gd892dcdcdd-goog