oom: oom_kill_process() doesn't select kthread child
Presently select_bad_process() has a PF_KTHREAD check, but
oom_kill_process doesn't. It mean oom_kill_process() may choose wrong
task, especially, when the child are using use_mm().
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.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 6e9f16a..b9816ea 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -467,6 +467,8 @@
if (child->mm == p->mm)
continue;
+ if (child->flags & PF_KTHREAD)
+ continue;
if (mem && !task_in_mem_cgroup(child, mem))
continue;
if (!has_intersects_mems_allowed(child, nodemask))