From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with ESMTP id ED2EC8D0039 for ; Wed, 16 Feb 2011 16:00:24 -0500 (EST) Received: from mail-iy0-f169.google.com (mail-iy0-f169.google.com [209.85.210.169]) (authenticated bits=0) by smtp1.linux-foundation.org (8.14.2/8.13.5/Debian-3ubuntu1.1) with ESMTP id p1GKxoie023697 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=FAIL) for ; Wed, 16 Feb 2011 12:59:50 -0800 Received: by iyi20 with SMTP id 20so1655423iyi.14 for ; Wed, 16 Feb 2011 12:59:50 -0800 (PST) MIME-Version: 1.0 In-Reply-To: References: <20110216185234.GA11636@tiehlicka.suse.cz> <20110216193700.GA6377@elte.hu> From: Linus Torvalds Date: Wed, 16 Feb 2011 12:51:21 -0800 Message-ID: Subject: Re: BUG: Bad page map in process udevd (anon_vma: (null)) in 2.6.38-rc4 Content-Type: text/plain; charset=ISO-8859-1 Sender: owner-linux-mm@kvack.org List-ID: To: Ingo Molnar Cc: Michal Hocko , linux-mm@kvack.org, LKML On Wed, Feb 16, 2011 at 12:09 PM, Linus Torvalds wrote: > > That said, neither 0x1e68 nor 0xe68 seems to be in the main vmlinux > file. But I haven't checked modules yet. There's no obvious clues in modules either. Sad. I was really hoping for some "oh, there's a list_head at offset 0x1e68 of structure 'xyz', that's obviously it". So maybe it really is something like a pointer to some on-stack data, and the 0x1e68 offset is just a random offset off the beginning of the stack (it's in the right range). The stack is still one of the few obvious 8kB allocations we have... CONFIG_DEBUG_PAGEALLOC really should catch it in that case, though. Linus -- 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