select_bad_process() thinks a kernel thread can't have ->mm != NULL,
this is not true due to use_mm().

Change the code to check PF_KTHREAD.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---

 mm/oom_kill.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- MM/mm/oom_kill.c~1_FLITER_OUT_KTHREADS	2010-03-31 17:47:14.000000000 +0200
+++ MM/mm/oom_kill.c	2010-04-02 18:51:05.000000000 +0200
@@ -290,8 +290,8 @@ static struct task_struct *select_bad_pr
 	for_each_process(p) {
 		unsigned int points;
 
-		/* skip the init task */
-		if (is_global_init(p))
+		/* skip the init task and kthreads */
+		if (is_global_init(p) || (p->flags & PF_KTHREAD))
 			continue;
 		if (mem && !task_in_mem_cgroup(p, mem))
 			continue;
@@ -331,8 +331,7 @@ static struct task_struct *select_bad_pr
 		}
 
 		/*
-		 * skip kernel threads and tasks which have already released
-		 * their mm.
+		 * skip the tasks which have already released their mm.
 		 */
 		if (!p->mm)
 			continue;

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