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| author | Stanislav Fomichev <sdf@google.com> | 2020-07-16 00:41:07 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2020-07-16 20:57:09 +0200 |
| commit | e81e7a533742c30615f8b15390df6525cef96778 (patch) | |
| tree | ecf1d3c7989e38766aab4b931daefdd8062d833c /tools/include | |
| parent | bpf: revert "test_bpf: Flag tests that cannot be jited on s390" (diff) | |
| download | linux-e81e7a533742c30615f8b15390df6525cef96778.tar.xz linux-e81e7a533742c30615f8b15390df6525cef96778.zip | |
selftests/bpf: Fix possible hang in sockopt_inherit
Andrii reported that sockopt_inherit occasionally hangs up on 5.5 kernel [0].
This can happen if server_thread runs faster than the main thread.
In that case, pthread_cond_wait will wait forever because
pthread_cond_signal was executed before the main thread was blocking.
Let's move pthread_mutex_lock up a bit to make sure server_thread
runs strictly after the main thread goes to sleep.
(Not sure why this is 5.5 specific, maybe scheduling is less
deterministic? But I was able to confirm that it does indeed
happen in a VM.)
[0] https://lore.kernel.org/bpf/CAEf4BzY0-bVNHmCkMFPgObs=isUAyg-dFzGDY7QWYkmm7rmTSg@mail.gmail.com/
Reported-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200715224107.3591967-1-sdf@google.com
Diffstat (limited to 'tools/include')
0 files changed, 0 insertions, 0 deletions