From: Nick Piggin <npiggin@suse.de>
Date: Tue, 26 Sep 2006 06:31:32 +0000 (-0700)
Subject: [PATCH] oom: kthread infinite loop fix
X-Git-Tag: firefly_0821_release~33558
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5081dde33f7a61d28d9b185cc386f12cb837c7a4;p=firefly-linux-kernel-4.4.55.git

[PATCH] oom: kthread infinite loop fix

Skip kernel threads, rather than having them return 0 from badness.
Theoretically, badness might truncate all results to 0, thus a kernel thread
might be picked first, causing an infinite loop.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index f1aba7e7b760..12cd4735dc29 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -207,6 +207,9 @@ static struct task_struct *select_bad_process(unsigned long *ppoints)
 		unsigned long points;
 		int releasing;
 
+		/* skip kernel threads */
+		if (!p->mm)
+			continue;
 		/* skip the init task with pid == 1 */
 		if (p->pid == 1)
 			continue;