mm: oom: do not reap task if there are live threads in threadgroup

If the current process is exiting, we don't invoke oom killer, instead
we give it access to memory reserves and try to reap its mm in case
nobody is going to use it.  There's a mistake in the code performing
this check - we just ignore any process of the same thread group no
matter if it is exiting or not - see try_oom_reaper.  Fix it.

Link: http://lkml.kernel.org/r/1464087628-7318-1-git-send-email-vdavydov@virtuozzo.com
Fixes: 3ef22dfff239 ("oom, oom_reaper: try to reap tasks which skip regular OOM killer path")Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 5bb2f7698ad7c077eb17998723df38c414336182..326dd14938f08d8278d6b536fee28e9c7bf05356 100644 (file)
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -611,8 +611,6 @@ void try_oom_reaper(struct task_struct *tsk)
 
                        if (!process_shares_mm(p, mm))
                                continue;
-                       if (same_thread_group(p, tsk))
-                               continue;
                        if (fatal_signal_pending(p))
                                continue;