On Thu, 1 Nov 2012, Minchan Kim wrote:
> If mutiple threads are page faulting and try to allocate memory, then they
> should go to oom path and they will reach following code.
>
> if (task->flags & PF_EXITING) {
> if (task == current)
> return OOM_SCAN_SELECT;
>
No, OOM_SCAN_SELECT does not return immediately and kill that process; it
only prefers to kill that process first iff the oom killer isn't deferred
because it finds TIF_MEMDIE threads or other PF_EXITING threads other than
current. So if multiple processes are in the exit path with PF_EXITING
and require additional memory then the oom killed may defer without
killing anything. That's what I suspect is happening in this case.
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