tetragon: another exit fix #1802
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[upstream commit 0c60ef2] Djalal and Anastasios found another way we could race in exit event hook, so we could receive multiple exit events with same pid value. Anastasios suggested to hook acct_process instead, which is called only for the last task in the thread group. The acct_process depends on CONFIG_BSD_PROCESS_ACCT config option but it seems to be present on all supported kernels. Signed-off-by: Jiri Olsa <jolsa@kernel.org>
[upstream commit 9a8f892] The previous commit fixes the exit event race that might cause tetragon to receive multiple exit events with same pid values. The contrib/tester-progs/threads-exit program tries to exploit this by creating multi threads and synchronize all their exit calls so it's likely to hit the race window. The TestEventExitThreads test itself spawn several executions of threads-exit program (to push the luck a bit and hit the race window at least once) and records their pid values and then check we receive single exit event for any given pid value. Signed-off-by: Jiri Olsa <jolsa@kernel.org>
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backport of #1509