linux-kernel - [24/67] cgroups: fix a css_set not found bug in cgroup_attach

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Message-Id: <20120103223033.360752073@clark.kroah.org>
Date:	Tue, 03 Jan 2012 14:29:42 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Mandeep Singh Baines <msb@...omium.org>,
	Tejun Heo <tj@...nel.org>,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul Menage <paul@...lmenage.org>,
	Olof Johansson <olofj@...omium.org>
Subject: [24/67] cgroups: fix a css_set not found bug in cgroup_attach_proc

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mandeep Singh Baines <msb@...omium.org>

commit e0197aae59e55c06db172bfbe1a1cdb8c0e1cab3 upstream.

There is a BUG when migrating a PF_EXITING proc. Since css_set_prefetch()
is not called for the PF_EXITING case, find_existing_css_set() will return
NULL inside cgroup_task_migrate() causing a BUG.

This bug is easy to reproduce. Create a zombie and echo its pid to
cgroup.procs.

$ cat zombie.c
\#include <unistd.h>

int main()
{
  if (fork())
      pause();
  return 0;
}
$

We are hitting this bug pretty regularly on ChromeOS.

This bug is already fixed by Tejun Heo's cgroup patchset which is
targetted for the next merge window:

https://lkml.org/lkml/2011/11/1/356

I've create a smaller patch here which just fixes this bug so that a
fix can be merged into the current release and stable.

Signed-off-by: Mandeep Singh Baines <msb@...omium.org>
Downstream-Bug-Report: http://crosbug.com/23953
Reviewed-by: Li Zefan <lizf@...fujitsu.com>
Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: containers@...ts.linux-foundation.org
Cc: cgroups@...r.kernel.org
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Paul Menage <paul@...lmenage.org>
Cc: Olof Johansson <olofj@...omium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 kernel/cgroup.c |    5 -----
 1 file changed, 5 deletions(-)

--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2095,11 +2095,6 @@ int cgroup_attach_proc(struct cgroup *cg
 			continue;
 		/* get old css_set pointer */
 		task_lock(tsk);
-		if (tsk->flags & PF_EXITING) {
-			/* ignore this task if it's going away */
-			task_unlock(tsk);
-			continue;
-		}
 		oldcg = tsk->cgroups;
 		get_css_set(oldcg);
 		task_unlock(tsk);


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