linux-kernel - [PATCH] mm: skip zombie in OOM-killer

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Date:	Sat,  5 Mar 2011 03:51:47 +0300
From:	Andrey Vagin <avagin@...nvz.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	avagin@...nvz.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm: skip zombie in OOM-killer

When we check that task has flag TIF_MEMDIE, we forgot check that
it has mm. A task may be zombie and a parent may wait a memor.

v2: Check that task doesn't have mm one time and skip it immediately

Signed-off-by: Andrey Vagin <avagin@...nvz.org>
---
 mm/oom_kill.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 7dcca55..b1ce3ba 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -299,6 +299,9 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
 	for_each_process(p) {
 		unsigned int points;
 
+		if (!p->mm)
+			continue;
+
 		if (oom_unkillable_task(p, mem, nodemask))
 			continue;
 
@@ -324,7 +327,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
 		 * the process of exiting and releasing its resources.
 		 * Otherwise we could get an easy OOM deadlock.
 		 */
-		if (thread_group_empty(p) && (p->flags & PF_EXITING) && p->mm) {
+		if (thread_group_empty(p) && (p->flags & PF_EXITING)) {
 			if (p != current)
 				return ERR_PTR(-1UL);
 
-- 
1.7.1

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