From b52279406e77be711c068f9a8e970ea6471e089c Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Mon, 9 Aug 2010 17:18:44 -0700 Subject: [PATCH] oom: PF_EXITING check should take mm into account select_bad_process() checks PF_EXITING to detect the task which is going to release its memory, but the logic is very wrong. - a single process P with the dead group leader disables select_bad_process() completely, it will always return ERR_PTR() while P can live forever - if the PF_EXITING task has already released its ->mm it doesn't make sense to expect it is goiing to free more memory (except task_struct/etc) Change the code to ignore the PF_EXITING tasks without ->mm. Signed-off-by: Oleg Nesterov Signed-off-by: David Rientjes Cc: Balbir Singh Acked-by: KOSAKI Motohiro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/oom_kill.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 7c0dc41..0a6e466 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -287,7 +287,7 @@ static struct task_struct *select_bad_process(unsigned long *ppoints, * the process of exiting and releasing its resources. * Otherwise we could get an easy OOM deadlock. */ - if (p->flags & PF_EXITING) { + if ((p->flags & PF_EXITING) && p->mm) { if (p != current) return ERR_PTR(-1UL); -- 2.7.4