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Revert "selftests/mm: fix deadlock for fork after pthread_create on ARM"

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Patch series "selftests/mm: revert pthread_barrier change"

On Android arm, pthread_create followed by a fork caused a deadlock in
the case where the fork required work to be completed by the created
thread.

The previous patches incorrectly assumed that the parent would
always initialize the pthread_barrier for the child thread.  This
reverts the change and replaces the fix for wp-fork-with-event with the
original use of atomic_bool.


This patch (of 3):

This reverts commit e142cc87ac.

fork_event_consumer may be called by other tests that do not initialize
the pthread_barrier, so this approach is not correct.  The subsequent
patch will revert to using atomic_bool instead.

Link: https://lkml.kernel.org/r/20241018171734.2315053-1-edliaw@google.com
Link: https://lkml.kernel.org/r/20241018171734.2315053-2-edliaw@google.com
Fixes: e142cc87ac ("fix deadlock for fork after pthread_create on ARM")
Signed-off-by: Edward Liaw <edliaw@google.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Edward Liaw 2024-10-18 17:17:22 +00:00 committed by Andrew Morton
parent e8133a7799
commit 5bb1f4c934
1 changed files with 0 additions and 7 deletions
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7
tools/testing/selftests/mm/uffd-unit-tests.c
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@ -241,9 +241,6 @@ 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));
@ -311,12 +308,8 @@ 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();