From: Ingo Molnar <mingo@elte.hu>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Balbir Singh <balbir@linux.vnet.ibm.com>,
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>,
Rik van Riel <riel@redhat.com>,
Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>,
lee.schermerhorn@hp.com, lizf@cn.fujitsu.com
Subject: Re: [crash, -git] NULL pointer dereference, IP: [<c0190884>] page_cgroup_zoneinfo+0xf/0x1b
Date: Tue, 21 Oct 2008 12:38:43 +0200 [thread overview]
Message-ID: <20081021103843.GA18150@elte.hu> (raw)
In-Reply-To: <20081021192143.67361afc.kamezawa.hiroyu@jp.fujitsu.com>
* KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
> > BUG: unable to handle kernel NULL pointer dereference at 00000000
> > IP: [<c018faa4>] 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:
[<c01895fe>] ? constant_test_bit+0xe/0x1b
[<c01898a1>] lock_page_cgroup+0x13/0x25
[<c0189e5f>] mem_cgroup_charge_common+0xfd/0x1bf
[<c018a56f>] mem_cgroup_cache_charge+0x7c/0x8a
[<c016bceb>] add_to_page_cache_locked+0x2f/0xc4
[<c016bda3>] add_to_page_cache_lru+0x23/0x5e
[<c016c3e9>] find_or_create_page+0x3f/0x62
[<c01a4709>] __getblk+0xfa/0x1cc
[<c01ff4fb>] jread+0x110/0x1ed
[<c01ff6d4>] do_one_pass+0xfc/0x476
[<c01408b0>] ? wake_bit_function+0x0/0x43
[<c01ffac8>] journal_recover+0x7a/0x13d
[<c0200d8e>] ? buffer_uptodate+0xc/0xe
[<c0201bd9>] journal_load+0x42/0x76
[<c01f810b>] 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
next prev parent reply other threads:[~2008-10-21 10:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-21 10:09 [crash, -git] NULL pointer dereference, IP: [<c0190884>] page_cgroup_zoneinfo+0xf/0x1b Ingo Molnar
2008-10-21 10:21 ` KAMEZAWA Hiroyuki
2008-10-21 10:38 ` Ingo Molnar [this message]
2008-10-21 10:43 ` Balbir Singh
2008-10-21 10:48 ` Li Zefan
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