selftests/mm: fix ARM related issue with fork after pthread_create

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commit 8c864371b2 upstream.

Following issue was observed while running the uffd-unit-tests selftest
on ARM devices. On x86_64 no issues were detected:

pthread_create followed by fork caused deadlock in certain cases wherein
fork required some work to be completed by the created thread.  Used
synchronization to ensure that created thread's start function has started
before invoking fork.

[edliaw@google.com: refactored to use atomic_bool]
Link: https://lkml.kernel.org/r/20240325194100.775052-1-edliaw@google.com
Fixes: 760aee0b71 ("selftests/mm: add tests for RO pinning vs fork()")
Signed-off-by: Lokesh Gidra <lokeshgidra@google.com>
Signed-off-by: Edward Liaw <edliaw@google.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Edward Liaw 2024-03-25 19:40:52 +00:00 • committed by Greg Kroah-Hartman

parent fe295de2d5

commit 07cf57eba5

3 changed files with 15 additions and 0 deletions

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tools/testing/selftests/mm/uffd-common.c

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2

tools/testing/selftests/mm/uffd-common.h

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10

tools/testing/selftests/mm/uffd-unit-tests.c

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