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authorKonstantin Khlebnikov <khlebnikov@openvz.org>2012-06-20 15:53:01 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-06-20 17:39:36 -0400
commit4fe7efdbdfb1c7e7a7f31decfd831c0f31d37091 (patch)
tree5d8fdf353ba3791ef10031ade2d93aa87aa179d3 /kernel/exit.c
parente0897d75f0b22e8c3a7287a48548c5686ef73447 (diff)
mm: correctly synchronize rss-counters at exit/exec
do_exit() and exec_mmap() call sync_mm_rss() before mm_release() does put_user(clear_child_tid) which can update task->rss_stat and thus make mm->rss_stat inconsistent. This triggers the "BUG:" printk in check_mm(). Let's fix this bug in the safest way, and optimize/cleanup this later. Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de> Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hugh Dickins <hughd@google.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/exit.c')
-rw-r--r--kernel/exit.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 34867cc5b42a..c0277d3f1aaa 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -643,6 +643,7 @@ static void exit_mm(struct task_struct * tsk)
643 mm_release(tsk, mm); 643 mm_release(tsk, mm);
644 if (!mm) 644 if (!mm)
645 return; 645 return;
646 sync_mm_rss(mm);
646 /* 647 /*
647 * Serialize with any possible pending coredump. 648 * Serialize with any possible pending coredump.
648 * We must hold mmap_sem around checking core_state 649 * We must hold mmap_sem around checking core_state