From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f199.google.com (mail-ob0-f199.google.com [209.85.214.199]) by kanga.kvack.org (Postfix) with ESMTP id 13F306B007E for ; Fri, 17 Jun 2016 19:58:17 -0400 (EDT) Received: by mail-ob0-f199.google.com with SMTP id ru5so374925obc.2 for ; Fri, 17 Jun 2016 16:58:17 -0700 (PDT) Received: from aserp1040.oracle.com (aserp1040.oracle.com. [141.146.126.69]) by mx.google.com with ESMTPS id b188si1194688ite.101.2016.06.17.16.58.16 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 17 Jun 2016 16:58:16 -0700 (PDT) Subject: Re: kernel, mm: NULL deref in copy_process while OOMing References: <57618763.5010201@oracle.com> <20160616093951.GD6836@dhcp22.suse.cz> From: Sasha Levin Message-ID: <57648E92.3070703@oracle.com> Date: Fri, 17 Jun 2016 19:58:10 -0400 MIME-Version: 1.0 In-Reply-To: <20160616093951.GD6836@dhcp22.suse.cz> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko Cc: "linux-mm@kvack.org" , LKML On 06/16/2016 05:39 AM, Michal Hocko wrote: > On Wed 15-06-16 12:50:43, Sasha Levin wrote: >> Hi all, >> >> I'm seeing the following NULL ptr deref in copy_process right after a bunch >> of OOM killing activity on -next kernels: >> >> Out of memory (oom_kill_allocating_task): Kill process 3477 (trinity-c159) score 0 or sacrifice child >> Killed process 3477 (trinity-c159) total-vm:3226820kB, anon-rss:36832kB, file-rss:1640kB, shmem-rss:444kB >> oom_reaper: reaped process 3477 (trinity-c159), now anon-rss:0kB, file-rss:0kB, shmem-rss:444kB >> Out of memory (oom_kill_allocating_task): Kill process 3450 (trinity-c156) score 0 or sacrifice child >> Killed process 3450 (trinity-c156) total-vm:3769768kB, anon-rss:36832kB, file-rss:1652kB, shmem-rss:508kB >> oom_reaper: reaped process 3450 (trinity-c156), now anon-rss:0kB, file-rss:0kB, shmem-rss:572kB >> BUG: unable to handle kernel NULL pointer dereference at 0000000000000150 >> IP: copy_process (./arch/x86/include/asm/atomic.h:103 kernel/fork.c:484 kernel/fork.c:964 kernel/fork.c:1018 kernel/fork.c:1484) >> PGD 1ff944067 PUD 1ff929067 PMD 0 >> Oops: 0002 [#1] PREEMPT SMP KASAN >> Modules linked in: >> CPU: 18 PID: 8761 Comm: trinity-main Not tainted 4.7.0-rc3-sasha-02101-g1e1b9fa #3108 > > Is this a common parent of the oom killed children? Yup, it's trying to spawn new ones while existing children are getting killed. Thanks, Sasha -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org