oom: avoid sending exiting tasks a SIGKILL

It's unnecessary to SIGKILL a task that is already PF_EXITING and can
actually cause a NULL pointer dereference of the sighand if it has already
been detached.  Instead, simply set TIF_MEMDIE so it has access to memory
reserves and can quickly exit as the comment implies.

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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>

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 64cdaca..0c7c18f 100644 (file)
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -453,7 +453,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
         * its children or threads, just set TIF_MEMDIE so it can die quickly
         */
        if (p->flags & PF_EXITING) {
-               __oom_kill_task(p, 0);
+               set_tsk_thread_flag(p, TIF_MEMDIE);
                return 0;
        }