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From: Michal Hocko <mhocko@suse.cz>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: David Rientjes <rientjes@google.com>,
	Konstantin Khlebnikov <khlebnikov@openvz.org>,
	Oleg Nesterov <oleg@redhat.com>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
	"Rafael J. Wysocki" <rjw@sisk.pl>,
	Rusty Russell <rusty@rustcorp.com.au>,
	Tejun Heo <htejun@gmail.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH 0/2] oom: fix livelock when frozen task is selected
Date: Tue, 27 Sep 2011 10:09:08 +0200	[thread overview]
Message-ID: <cover.1317110948.git.mhocko@suse.cz> (raw)

Hi Andrew,
this small patchset addresses a possible livelock when OOM killer tries
to kill a frozen task. The issue has been reported by Konstantin
Khlebnikov at https://lkml.org/lkml/2011/8/23/45.

The first patch addresses a possible issue in lguest which calls
try_to_freeze with user context and then continues with other work after
it returns from the fridge.

The second patch addresses the issue by thawing the frozen task in the
oom kill path.

Michal Hocko (2):
  lguest: move process freezing before pending signals check
  oom: do not live lock on frozen tasks

 drivers/lguest/core.c |   14 +++++++-------
 mm/oom_kill.c         |    6 ++++++
 2 files changed, 13 insertions(+), 7 deletions(-)

-- 
1.7.5.4

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             reply	other threads:[~2011-09-27 18:10 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-27  8:09 Michal Hocko [this message]
2011-09-27  6:56 ` [PATCH 1/2] lguest: move process freezing before pending signals check Michal Hocko
2011-10-12  6:55   ` Michal Hocko
2011-10-12  6:55     ` Michal Hocko
2011-10-12 23:57     ` Rusty Russell
2011-10-12 23:57       ` Rusty Russell
2011-10-13  5:48       ` Michal Hocko
2011-10-13  5:48         ` Michal Hocko
2011-09-27  8:01 ` [PATCH 2/2] oom: do not live lock on frozen tasks Michal Hocko
2011-09-27 18:35   ` [patch] oom: thaw threads if oom killed thread is frozen before deferring David Rientjes
2011-09-27 18:35     ` David Rientjes
2011-09-28 10:44     ` Michal Hocko
2011-09-28 10:44       ` Michal Hocko
2011-09-29 11:51       ` Michal Hocko
2011-09-29 11:51         ` Michal Hocko
2011-09-29 12:05         ` Oleg Nesterov
2011-09-29 12:05           ` Oleg Nesterov
2011-09-29 13:02           ` Michal Hocko
2011-09-29 13:02             ` Michal Hocko
2011-09-29 16:32             ` Michal Hocko
2011-09-29 16:32               ` Michal Hocko
2011-09-29 16:37             ` Oleg Nesterov
2011-09-29 16:37               ` Oleg Nesterov
2011-09-29 18:00               ` Michal Hocko
2011-09-29 18:00                 ` Michal Hocko
2011-09-30  1:51                 ` Tejun Heo
2011-09-30  1:51                   ` Tejun Heo
2011-09-30  7:41                   ` Michal Hocko
2011-09-30  7:41                     ` Michal Hocko
2011-09-30  7:46                     ` Tejun Heo
2011-09-30  7:46                       ` Tejun Heo
2011-09-30  8:04                       ` Michal Hocko
2011-09-30  8:04                         ` Michal Hocko
2011-09-30 15:30                 ` Oleg Nesterov
2011-09-30 15:30                   ` Oleg Nesterov
2011-10-28 22:23   ` [PATCH 2/2] oom: do not live lock on frozen tasks Andrew Morton
2011-10-28 22:23     ` Andrew Morton
2011-10-29  9:01     ` Michal Hocko
2011-10-29  9:01       ` Michal Hocko

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