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Date:	Mon, 31 Mar 2014 00:23:35 +0100
From:	Ben Hutchings <>
CC:, "Li Zefan" <>,
	"Tejun Heo" <>
Subject: [PATCH 3.2 129/200] cgroup: update cgroup_enable_task_cg_lists()
 to grab siglock

3.2.56-rc1 review patch.  If anyone has any objections, please let me know.


From: Tejun Heo <>

commit 532de3fc72adc2a6525c4d53c07bf81e1732083d upstream.

Currently, there's nothing preventing cgroup_enable_task_cg_lists()
from missing set PF_EXITING and race against cgroup_exit().  Depending
on the timing, cgroup_exit() may finish with the task still linked on
css_set leading to list corruption.  Fix it by grabbing siglock in
cgroup_enable_task_cg_lists() so that PF_EXITING is guaranteed to be

This whole on-demand cg_list optimization is extremely fragile and has
ample possibility to lead to bugs which can cause things like
once-a-year oops during boot.  I'm wondering whether the better
approach would be just adding "cgroup_disable=all" handling which
disables the whole cgroup rather than tempting fate with this
on-demand craziness.

Signed-off-by: Tejun Heo <>
Acked-by: Li Zefan <>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <>
 kernel/cgroup.c | 5 +++++
 1 file changed, 5 insertions(+)

--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2785,9 +2785,14 @@ static void cgroup_enable_task_cg_lists(
 		 * We should check if the process is exiting, otherwise
 		 * it will race with cgroup_exit() in that the list
 		 * entry won't be deleted though the process has exited.
+		 * Do it while holding siglock so that we don't end up
+		 * racing against cgroup_exit().
+		spin_lock_irq(&p->sighand->siglock);
 		if (!(p->flags & PF_EXITING) && list_empty(&p->cg_list))
 			list_add(&p->cg_list, &p->cgroups->tasks);
+		spin_unlock_irq(&p->sighand->siglock);
 	} while_each_thread(g, p);

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