The patch titled
oom: avoid sending exiting tasks a SIGKILL
has been added to the -mm tree. Its filename is
oom-avoid-sending-exiting-tasks-a-sigkill.patch
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------------------------------------------------------
Subject: oom: avoid sending exiting tasks a SIGKILL
From: David Rientjes <rientjes@xxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/oom_kill.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/oom_kill.c~oom-avoid-sending-exiting-tasks-a-sigkill mm/oom_kill.c
--- a/mm/oom_kill.c~oom-avoid-sending-exiting-tasks-a-sigkill
+++ a/mm/oom_kill.c
@@ -458,7 +458,7 @@ static int oom_kill_process(struct task_
* 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;
}
_
Patches currently in -mm which might be from rientjes@xxxxxxxxxx are
avr32-invoke-oom-killer-from-page-fault.patch
oom-check-pf_kthread-instead-of-mm-to-skip-kthreads.patch
oom-introduce-find_lock_task_mm-to-fix-mm-false-positives.patch
oom-dump_tasks-use-find_lock_task_mm-too.patch
oom-pf_exiting-check-should-take-mm-into-account.patch
oom-give-current-access-to-memory-reserves-if-it-has-been-killed.patch
oom-avoid-sending-exiting-tasks-a-sigkill.patch
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