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Date:	Sun, 30 Sep 2012 12:29:30 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Rob Herring <rob.herring@...xeda.com>
Cc:	Leann Ogasawara <leann.ogasawara@...onical.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [ubuntu quantal] BUG: unable to handle kernel NULL pointer
 dereference at 0000000000000008

Hi,

I got the below oops in tree:

   git://sources.calxeda.com/kernel/linux.git ubuntu-quantal

[    0.113205]  domain 0: span 0-1 level CPU
[    0.113989] kvm-stealtime: cpu 1, msr dc0db40
[    0.147082] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[    0.147982] IP: [<ffffffff8113e241>] __mark_inode_dirty+0x1f0/0x25d
[    0.147985] PGD 0 
[    0.147985] Oops: 0002 [#1] SMP DEBUG_PAGEALLOC
[    0.147985] CPU 0 
[    0.147985] Pid: 5, comm: kworker/u:0 Not tainted 3.5.4-00550-g6b458eb #2427  
[    0.147985] RIP: 0010:[<ffffffff8113e241>]  [<ffffffff8113e241>] __mark_inode_dirty+0x1f0/0x25d
[    0.147985] RSP: 0018:ffff880000071a60  EFLAGS: 00010282
[    0.147985] RAX: ffff88000d04c598 RBX: ffff88000d04c3f8 RCX: ffff88000d04c598
[    0.147985] RDX: 0000000000000000 RSI: ffffffff81b58ab8 RDI: ffffffff81b58aa0
[    0.147985] RBP: ffff880000071a80 R08: 0000000000000000 R09: 00004d82700e20a4
[    0.147985] R10: ffffffff8113e20c R11: ffffffff817afba8 R12: ffffffff81b586e0
[    0.147985] R13: 0000000000000000 R14: ffffffff81b58aa0 R15: 0000000000040000
[    0.147985] FS:  0000000000000000(0000) GS:ffff88000da00000(0000) knlGS:0000000000000000
[    0.147985] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[    0.147985] CR2: 0000000000000008 CR3: 0000000001b29000 CR4: 00000000000006b0
[    0.147985] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    0.147985] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[    0.147985] Process kworker/u:0 (pid: 5, threadinfo ffff880000070000, task ffff88000006a1c0)
[    0.147985] Stack:
[    0.147985]  ffff88000d04c3f8 ffff880000071b40 0000000000000000 ffff88000d008000
[    0.147985]  ffff880000071ab0 ffffffff81138a3b 0000000000000128 0000000000001846
[    0.147985]  ffff880000071b40 ffff88000d04c3f8 ffff880000071b20 ffffffff81131e52
[    0.147985] Call Trace:
[    0.147985]  [<ffffffff81138a3b>] simple_setattr+0x80/0x8b
[    0.147985]  [<ffffffff81131e52>] notify_change+0x1aa/0x290
[    0.147985]  [<ffffffff81e113ca>] ? initrd_load+0x3f/0x3f
[    0.147985]  [<ffffffff81e11505>] ? write_buffer+0x32/0x32
[    0.147985]  [<ffffffff811188ed>] chown_common.isra.24+0x6f/0x86
[    0.147985]  [<ffffffff81119049>] sys_chown+0x4e/0x77
[    0.147985]  [<ffffffff81e121fc>] do_name+0x250/0x28b
[    0.147985]  [<ffffffff81e114f5>] write_buffer+0x22/0x32
[    0.147985]  [<ffffffff81e11571>] flush_buffer+0x6c/0x89
[    0.147985]  [<ffffffff81e336c6>] gunzip+0x266/0x2fa
[    0.147985]  [<ffffffff81e33457>] ? bunzip2+0x3a8/0x3a8
[    0.147985]  [<ffffffff81e11865>] unpack_to_rootfs+0x154/0x27e
[    0.147985]  [<ffffffff81e113ca>] ? initrd_load+0x3f/0x3f
[    0.147985]  [<ffffffff81e11f03>] async_populate_rootfs+0x57/0x100
[    0.147985]  [<ffffffff81079703>] async_run_entry_fn+0xa1/0x150
[    0.147985]  [<ffffffff8106d181>] process_one_work+0x23c/0x460
[    0.147985]  [<ffffffff8106d0e4>] ? process_one_work+0x19f/0x460
[    0.147985]  [<ffffffff81079662>] ? __async_schedule+0x146/0x146
[    0.147985]  [<ffffffff8106d536>] worker_thread+0x162/0x243
[    0.147985]  [<ffffffff8106d3d4>] ? process_scheduled_works+0x2f/0x2f
[    0.147985]  [<ffffffff810728e7>] kthread+0xaf/0xb7
[    0.147985]  [<ffffffff812e1945>] ? do_raw_spin_unlock+0xa7/0xb0
[    0.147985]  [<ffffffff817b24b4>] kernel_thread_helper+0x4/0x10
[    0.147985]  [<ffffffff817b0870>] ? retint_restore_args+0x13/0x13
[    0.147985]  [<ffffffff81072838>] ? kthread_flush_work_fn+0x14/0x14
[    0.147985]  [<ffffffff817b24b0>] ? gs_change+0x13/0x13
[    0.147985] Code: a0 01 00 00 4c 89 f7 48 8b 05 dc bd af 00 48 89 83 88 01 00 00 48 89 51 08 48 8d 83 a0 01 00 00 48 89 0a 49 8b 94 24 90 03 00 00 <48> 89 42 08 48 89 93 a0 01 00 00 49 8d 94 24 90 03 00 00 48 89 
[    0.147985] RIP  [<ffffffff8113e241>] __mark_inode_dirty+0x1f0/0x25d
[    0.147985]  RSP <ffff880000071a60>
[    0.147985] CR2: 0000000000000008

It's bisected down to

commit 3166c8772f6b30a9f121a52b4f0e71f9f81598c4
Author: Leann Ogasawara <leann.ogasawara@...onical.com>
Date:   Fri Mar 12 17:13:25 2010 -0800

    UBUNTU: (no-up) fold down debian for ubuntu-q v3.5-rc1 rebase

However it's not obvious if it's relevant..

Thanks,
Fengguang

View attachment "dmesg-kvm-waimea-3400-2012-09-30-09-50-47-3.5.4-00550-g6b458eb-2427" of type "text/plain" (19252 bytes)

View attachment "config-3.5.4-00550-g6b458eb" of type "text/plain" (62084 bytes)

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