The patch titled
Subject: mm, oom: task_will_free_mem should skip oom_reaped tasks
has been removed from the -mm tree. Its filename was
mm-oom-task_will_free_mem-should-skip-oom_reaped-tasks.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Michal Hocko <mhocko@xxxxxxxx>
Subject: mm, oom: task_will_free_mem should skip oom_reaped tasks
0-day robot has encountered the following:
[ 82.694232] Out of memory: Kill process 3914 (trinity-c0) score 167 or sacrifice child
[ 82.695110] Killed process 3914 (trinity-c0) total-vm:55864kB, anon-rss:1512kB, file-rss:1088kB, shmem-rss:25616kB
[ 82.706724] oom_reaper: reaped process 3914 (trinity-c0), now anon-rss:0kB, file-rss:0kB, shmem-rss:26488kB
[ 82.715540] oom_reaper: reaped process 3914 (trinity-c0), now anon-rss:0kB, file-rss:0kB, shmem-rss:26900kB
[ 82.717662] oom_reaper: reaped process 3914 (trinity-c0), now anon-rss:0kB, file-rss:0kB, shmem-rss:26900kB
[ 82.725804] oom_reaper: reaped process 3914 (trinity-c0), now anon-rss:0kB, file-rss:0kB, shmem-rss:27296kB
[ 82.739091] oom_reaper: reaped process 3914 (trinity-c0), now anon-rss:0kB, file-rss:0kB, shmem-rss:28148kB
oom_reaper is trying to reap the same task again and again. This is
possible only when the oom killer is bypassed because of
task_will_free_mem because we skip over tasks with MMF_OOM_REAPED already
set during select_bad_process. Teach task_will_free_mem to skip over
MMF_OOM_REAPED tasks as well because they will be unlikely to free
anything more.
Analyzed by Tetsuo Handa.
Link: http://lkml.kernel.org/r/1466426628-15074-9-git-send-email-mhocko@xxxxxxxxxx
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/oom_kill.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff -puN mm/oom_kill.c~mm-oom-task_will_free_mem-should-skip-oom_reaped-tasks mm/oom_kill.c
--- a/mm/oom_kill.c~mm-oom-task_will_free_mem-should-skip-oom_reaped-tasks
+++ a/mm/oom_kill.c
@@ -747,6 +747,16 @@ bool task_will_free_mem(struct task_stru
return false;
mm = p->mm;
+
+ /*
+ * 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_REAPED, &mm->flags)) {
+ task_unlock(p);
+ return false;
+ }
+
if (atomic_read(&mm->mm_users) <= 1) {
task_unlock(p);
return true;
_
Patches currently in -mm which might be from mhocko@xxxxxxxx are
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