From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail144.messagelabs.com (mail144.messagelabs.com [216.82.254.51]) by kanga.kvack.org (Postfix) with SMTP id 23BC58D0039 for ; Thu, 17 Feb 2011 22:16:27 -0500 (EST) From: ebiederm@xmission.com (Eric W. Biederman) References: <20110216185234.GA11636@tiehlicka.suse.cz> <20110216193700.GA6377@elte.hu> <20110217090910.GA3781@tiehlicka.suse.cz> <20110217163531.GF14168@elte.hu> Date: Thu, 17 Feb 2011 19:16:17 -0800 In-Reply-To: (Linus Torvalds's message of "Thu, 17 Feb 2011 11:11:51 -0800") Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: Re: BUG: Bad page map in process udevd (anon_vma: (null)) in 2.6.38-rc4 Sender: owner-linux-mm@kvack.org List-ID: To: Linus Torvalds Cc: Ingo Molnar , Michal Hocko , linux-mm@kvack.org, LKML Linus Torvalds writes: > On Thu, Feb 17, 2011 at 10:57 AM, Eric W. Biederman > wrote: >> >> fedora 14 >> ext4 on all filesystems > > Your dmesg snippets had ext3 mentioned, though: > > <6>EXT3-fs (sda1): recovery required on readonly filesystem > <6>EXT3-fs (sda1): write access will be enabled during recovery > <6>EXT3-fs: barriers not enabled > .. > <6>EXT3-fs (sda1): recovery complete > <6>EXT3-fs (sda1): mounted filesystem with ordered data mode > <6>dracut: Mounted root filesystem /dev/sda1 > > not that I see that it should matter, but there's been some bigger > ext3 changes too (like the batched discard). > > I don't really think ext3 is the issue, though. > >> I was about to say this happens with DEBUG_PAGEALLOC enabled but it >> appears that options keeps eluding my fingers when I have a few minutes >> to play with it. =C2=A0Perhaps this time will be the charm. > > Please do. You seem to be much better at triggering it than anybody > else. And do the DEBUG_LIST and DEBUG_SLUB_ON things too (even if the > DEBUG_LIST thing won't catch list_move()) Interesting. I just got this with DEBUG_PAGEALLOC It looks like something in DEBUG_PAGEALLOC is interfering with taking a successful crashdump. Given how many network namespaces I create and destroy this might be a code path I exercise more than most people. BUG: unable to handle kernel paging request at ffff8801adf8d760 IP: [] unregister_netdevice_queue+0x3a/0xb0 Oops: 0002 [#1] SMP DEBUG_PAGEALLOC last sysfs file: /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map Stack: Call Trace: Code: 24 08 48 89 fb 49 89 f4 e8 f4 c8 00 00 85 c0 74 6d 4d 85 e4 74 3b 48 = 8b 93 a0 00 00 00 48 8b 83 a8 00 00 00 48 8d bb a0 00 00 00 <48> 89 42 08 4= 8 89 10 4c 89 e2 49 8b 74 24 08 e8 32 75 e7 ff 48=20 RIP [] unregister_netdevice_queue+0x3a/0xb0 CR2: ffff8801adf8d760 Eric -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org