diff options
| author | Hugh Dickins <hughd@google.com> | 2014-03-03 15:38:24 -0800 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-03-22 22:01:48 +0100 |
| commit | 9d865d440a5e684ce5ec54ae7866c7e58bd46a14 (patch) | |
| tree | c42c7dbc45ce90b81089639ff97e6d19fe3d06ae /mm | |
| parent | 313bb2423954fc861816e6c06a513df6334b66d8 (diff) | |
memcg: fix endless loop in __mem_cgroup_iter_next()
commit ce48225fe3b1b0d1fc9fceb96ac3d8a879e45114 upstream.
Commit 0eef615665ed ("memcg: fix css reference leak and endless loop in
mem_cgroup_iter") got the interaction with the commit a few before it
d8ad30559715 ("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: 0eef615665ed ("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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memcontrol.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index a3be835d999f..15429b92ff98 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1089,8 +1089,8 @@ 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; |