From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753375AbYJUKjb (ORCPT ); Tue, 21 Oct 2008 06:39:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752169AbYJUKjY (ORCPT ); Tue, 21 Oct 2008 06:39:24 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:48138 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752138AbYJUKjX (ORCPT ); Tue, 21 Oct 2008 06:39:23 -0400 Date: Tue, 21 Oct 2008 12:38:43 +0200 From: Ingo Molnar To: KAMEZAWA Hiroyuki Cc: Andrew Morton , linux-kernel@vger.kernel.org, Linus Torvalds , Balbir Singh , Daisuke Nishimura , Rik van Riel , Hiroshi Shimamoto , lee.schermerhorn@hp.com, lizf@cn.fujitsu.com Subject: Re: [crash, -git] NULL pointer dereference, IP: [] page_cgroup_zoneinfo+0xf/0x1b Message-ID: <20081021103843.GA18150@elte.hu> References: <20081021100935.GA7100@elte.hu> <20081021192143.67361afc.kamezawa.hiroyu@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081021192143.67361afc.kamezawa.hiroyu@jp.fujitsu.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00,DNS_FROM_SECURITYSAGE autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] 0.0 DNS_FROM_SECURITYSAGE RBL: Envelope sender in blackholes.securitysage.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * KAMEZAWA Hiroyuki wrote: > > BUG: unable to handle kernel NULL pointer dereference at 00000000 > > IP: [] page_cgroup_zoneinfo+0xf/0x1b [...] > > bad: a9b6148: USB: Fix unused label warnings in drivers/usb/host/ehci-hcd.c > > good: c813b4e: Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/ > > > yes, now chasing. and have found > > page_cgroup->page is NULL because of unknown reason. i've attempted to bisect it - but the most critical part of this series is not bisectable, the bootup hangs at this tree: 40b6a76: cpuset.c: remove extra variable It hangs in the mm/cgroups code at: [] ? constant_test_bit+0xe/0x1b [] lock_page_cgroup+0x13/0x25 [] mem_cgroup_charge_common+0xfd/0x1bf [] mem_cgroup_cache_charge+0x7c/0x8a [] add_to_page_cache_locked+0x2f/0xc4 [] add_to_page_cache_lru+0x23/0x5e [] find_or_create_page+0x3f/0x62 [] __getblk+0xfa/0x1cc [] jread+0x110/0x1ed [] do_one_pass+0xfc/0x476 [] ? wake_bit_function+0x0/0x43 [] journal_recover+0x7a/0x13d [] ? buffer_uptodate+0xc/0xe [] journal_load+0x42/0x76 [] ext3_fill_super+0xd9c/0x1491 My bisection got this far: # good: [c813b4e1] Merge git://git.kernel.org/pub/scm/linux/kernel/gi # bad: [a9b6148d] USB: Fix unused label warnings in drivers/usb/host # bad: [656eb2cd] add CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS # good: [bdbf0ac7] Merge branch 'hwmon-for-linus' of git://jdelvare.p # good: [f7ea4a4b] Merge branch 'drm-next' of git://git.kernel.org/pu # good: [556adecb] vmscan: second chance replacement for anonymous pa # good: [28f74e71] hwmon/pc87360 separate alarm files: define some co # good: [46d01a22] ext3: fix ext3 block reservation early ENOSPC issu # good: [47c59803] devcgroup: remove spin_lock() The remaining bisection window of uncategorized commits is: nr of bisection commits: 14 ---------------------------- 656eb2c: add CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS 6409324: coredump: format_corename: don't append .%pid if multi-threaded b747c8c: make ptrace_untrace() static c459643: bitmask: remove bitmap_scnprintf_len() 30e8e13: cpuset: use seq_*mask_* to print masks 3eda201: seq_file: add seq_cpumask_list(), seq_nodemask_list() 85dd030: seq_file: don't call bitmap_scnprintf_len() 40b6a76: cpuset.c: remove extra variable 52d4b9a: memcg: allocate all page_cgroup at boot c05555b: memcg: atomic ops for page_cgroup->flags addb9ef: memcg: optimize per-cpu statistics 5b4e655: memcg: avoid accounting special pages b7abea9: memcg: make page->mapping NULL before uncharge 073e587: memcg: move charge swapin under lock i'll poke in the middle - maybe i'm lucky and can find a working/crashing tree to nudge the bisection back into life. Ingo