oom_kill_process() simply sets TIF_MEMDIE and returns if PF_EXITING.
This is very wrong by many reasons. In particular, this thread can
be the dead group leader. Check p->mm != NULL.
Note: this is _not_ enough. Just a minimal fix.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
---
mm/oom_kill.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- 38/mm/oom_kill.c~1_kill_fix_pf_exiting 2011-03-14 17:53:05.000000000 +0100
+++ 38/mm/oom_kill.c 2011-03-14 18:51:49.000000000 +0100
@@ -470,7 +470,7 @@ static int oom_kill_process(struct task_
* If the task is already exiting, don't alarm the sysadmin or kill
* its children or threads, just set TIF_MEMDIE so it can die quickly
*/
- if (p->flags & PF_EXITING) {
+ if (p->flags & PF_EXITING && p->mm) {
set_tsk_thread_flag(p, TIF_MEMDIE);
boost_dying_task_prio(p, mem);
return 0;
--
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