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memcg: fix endless loop in __mem_cgroup_iter_next()

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Commit 0eef615665 ("memcg: fix css reference leak and endless loop in
mem_cgroup_iter") got the interaction with the commit a few before it
d8ad305597 ("mm/memcg: iteration skip memcgs not yet fully
initialized") slightly wrong, and we didn't notice at the time.

It's elusive, and harder to get than the original, but for a couple of
days before rc1, I several times saw a endless loop similar to that
supposedly being fixed.

This time it was a tighter loop in __mem_cgroup_iter_next(): because we
can get here when our root has already been offlined, and the ordering
of conditions was such that we then just cycled around forever.

Fixes: 0eef615665 ("memcg: fix css reference leak and endless loop in mem_cgroup_iter").
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Greg Thelen <gthelen@google.com>
Cc: <stable@vger.kernel.org>	[3.12+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2014-03-03 15:38:24 -08:00 committed by Linus Torvalds
parent 5f30fc94ca
commit ce48225fe3
1 changed files with 2 additions and 2 deletions
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4
mm/memcontrol.c
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@ -1127,8 +1127,8 @@ skip_node:
* skipping css reference should be safe.
*/
if (next_css) {
if ((next_css->flags & CSS_ONLINE) &&
(next_css == &root->css || css_tryget(next_css)))
if ((next_css == &root->css) ||
((next_css->flags & CSS_ONLINE) && css_tryget(next_css)))
return mem_cgroup_from_css(next_css);
prev_css = next_css;