On Tue 26-09-17 20:27:40, Tetsuo Handa wrote:
[...]
> @@ -794,8 +794,10 @@ static bool task_will_free_mem(struct task_struct *task)
> * This task has already been drained by the oom reaper so there are
> * only small chances it will free some more
> */
> - if (test_bit(MMF_OOM_SKIP, &mm->flags))
> + if (test_bit(MMF_OOM_SKIP, &mm->flags)) {
> + WARN(1, "Racing OOM victim selection. Please report to linux-mm@xxxxxxxxx if you saw this warning from non-artificial workloads.\n");
> return false;
> + }
This can easily happen even without a race. Just consider that OOM
memory reserves got depleted. I think that the existing oom report will
tell us that the race happened by checking the mm counters.
--
Michal Hocko
SUSE Labs
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