From 491a1c65ae498dea0e39b24a46e528a78a8532ed Mon Sep 17 00:00:00 2001 From: Tetsuo Handa Date: Fri, 24 Jun 2016 14:48:35 -0700 Subject: [PATCH] mm,oom_reaper: don't call mmput_async() without atomic_inc_not_zero() Commit e2fe14564d33 ("oom_reaper: close race with exiting task") reduced frequency of needlessly selecting next OOM victim, but was calling mmput_async() when atomic_inc_not_zero() failed. Link: http://lkml.kernel.org/r/1464423365-5555-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp Signed-off-by: Tetsuo Handa Acked-by: Michal Hocko Cc: Arnd Bergmann Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/oom_kill.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/oom_kill.c b/mm/oom_kill.c index acbc432d1a52..be67df3b6569 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -478,6 +478,7 @@ static bool __oom_reap_task(struct task_struct *tsk) mm = p->mm; if (!atomic_inc_not_zero(&mm->mm_users)) { task_unlock(p); + mm = NULL; goto unlock_oom; } -- 2.20.1