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    Subject[14/55] oom: skip zombies when iterating tasklist
    2.6.37-stable review patch.  If anyone has any objections, please let us know.

    ------------------

    From: Andrey Vagin <avagin@openvz.org>

    commit 30e2b41f20b6238f51e7cffb879c7a0f0073f5fe upstream.

    We shouldn't defer oom killing if a thread has already detached its ->mm
    and still has TIF_MEMDIE set. Memory needs to be freed, so find kill
    other threads that pin the same ->mm or find another task to kill.

    Signed-off-by: Andrey Vagin <avagin@openvz.org>
    Signed-off-by: David Rientjes <rientjes@google.com>
    Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    mm/oom_kill.c | 4 +++-
    1 file changed, 3 insertions(+), 1 deletion(-)

    --- a/mm/oom_kill.c
    +++ b/mm/oom_kill.c
    @@ -299,6 +299,8 @@ static struct task_struct *select_bad_pr
    do_each_thread(g, p) {
    unsigned int points;

    + if (!p->mm)
    + continue;
    if (oom_unkillable_task(p, mem, nodemask))
    continue;

    @@ -324,7 +326,7 @@ static struct task_struct *select_bad_pr
    * the process of exiting and releasing its resources.
    * Otherwise we could get an easy OOM deadlock.
    */
    - if ((p->flags & PF_EXITING) && p->mm) {
    + if (p->flags & PF_EXITING) {
    if (p != current)
    return ERR_PTR(-1UL);




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