The patch titled Subject: mm: don't emit warning from pagefault_out_of_memory() has been added to the -mm tree. Its filename is mm-dont-emit-warning-from-pagefault_out_of_memory.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-dont-emit-warning-from-pagefault_out_of_memory.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-dont-emit-warning-from-pagefault_out_of_memory.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> Subject: mm: don't emit warning from pagefault_out_of_memory() Commit c32b3cbe0d067a9c ("oom, PM: make OOM detection in the freezer path raceless") inserted a WARN_ON() into pagefault_out_of_memory() in order to warn when we raced with disabling the OOM killer. But emitting same backtrace forever after the OOM killer/reaper are disabled is pointless because the system is already OOM livelocked. Now, patch "oom, suspend: fix oom_killer_disable vs. pm suspend properly" introduced a timeout for oom_killer_disable(). Even if we raced with disabling the OOM killer and the system is OOM livelocked, the OOM killer will be enabled eventually (in 20 seconds by default) and the OOM livelock will be solved. Therefore, we no longer need to warn when we raced with disabling the OOM killer. Link: http://lkml.kernel.org/r/1473442120-7246-1-git-send-email-penguin-kernel@xxxxxxxxxxxxxxxxxxx Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/oom_kill.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-) diff -puN mm/oom_kill.c~mm-dont-emit-warning-from-pagefault_out_of_memory mm/oom_kill.c --- a/mm/oom_kill.c~mm-dont-emit-warning-from-pagefault_out_of_memory +++ a/mm/oom_kill.c @@ -1069,16 +1069,6 @@ void pagefault_out_of_memory(void) if (!mutex_trylock(&oom_lock)) return; - - if (!out_of_memory(&oc)) { - /* - * There shouldn't be any user tasks runnable while the - * OOM killer is disabled, so the current task has to - * be a racing OOM victim for which oom_killer_disable() - * is waiting for. - */ - WARN_ON(test_thread_flag(TIF_MEMDIE)); - } - + out_of_memory(&oc); mutex_unlock(&oom_lock); } _ Patches currently in -mm which might be from penguin-kernel@xxxxxxxxxxxxxxxxxxx are mmoom_reaper-reduce-find_lock_task_mm-usage.patch mmoom_reaper-do-not-attempt-to-reap-a-task-twice.patch mm-oom-enforce-exit_oom_victim-on-current-task.patch mm-dont-emit-warning-from-pagefault_out_of_memory.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html