Thread (8 messages) 8 messages, 3 authors, 2016-06-03

Re: [PATCH] mm,oom_reaper: don't call mmput_async() without atomic_inc_not_zero()

From: Michal Hocko <hidden>
Date: 2016-05-30 06:52:16

On Sat 28-05-16 17:16:05, Tetsuo Handa wrote:
Commit e2fe14564d3316d1 ("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.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Michal Hocko <mhocko@suse.com>

Thanks!
quoted hunk ↗ jump to hunk
---
 mm/oom_kill.c | 1 +
 1 file changed, 1 insertion(+)
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index dfb1ab6..0d781b8 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;
 	}
 
-- 
1.8.3.1
-- 
Michal Hocko
SUSE Labs

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