linux-kernel - [blk_dequeue_request] kernel BUG at block/blk-core.c:2126!

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Date:	Fri, 26 Oct 2012 22:11:38 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: [blk_dequeue_request] kernel BUG at block/blk-core.c:2126!

Greetings,

Here is a one-shot linux-next oops which seems rather hard to
reproduce. bisect is on the way, however will take quite long time..

[   43.530577] work still pending
[   43.530897] ------------[ cut here ]------------
[   43.530900] kernel BUG at /c/kernel-tests/src/linux/block/blk-core.c:2126!
[   43.530908] invalid opcode: 0000 [#1] SMP 
[   43.530926] Pid: 79, comm: kworker/u:2 Not tainted 3.7.0-rc2-next-20121026 #18 Bochs Bochs
[   43.530928] EIP: 0060:[<c1279723>] EFLAGS: 00010086 CPU: 0
[   43.530950] EIP is at blk_dequeue_request+0x11/0x4a
[   43.530951] EAX: c79f4000 EBX: c79f4000 ECX: c79f4000 EDX: 00000000
[   43.530952] ESI: c197eea0 EDI: 00000001 EBP: cf8f3f00 ESP: cf8f3ef8
[   43.530953]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[   43.530954] CR0: 8005003b CR2: 00000000 CR3: 01a3e000 CR4: 000006d0
[   43.530962] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[   43.530965] DR6: ffff0ff0 DR7: 00000400
[   43.530967] Process kworker/u:2 (pid: 79, ti=cf8f2000 task=c7b960a0 task.ti=cf8f2000)
[   43.530967] Stack:
[   43.530970]  c1279767 c79f4000 cf8f3f0c c1279eda 00000000 cf8f3f18 c146db80 cf8ecc80
[   43.530973]  cf8f3f44 c103e5e3 cf8f3f28 c146db10 c1a6970c cd921200 00000000 c1a69600
[   43.530976]  cf8ecc80 c1a6970c cf8ecc90 cf8f3f68 c103e90c c7b960a0 cf8ecc90 cd857ebc
[   43.530976] Call Trace:
[   43.531028]  [<c1279767>] ? blk_start_request+0xb/0x31
[   43.531029]  [<c1279eda>] blk_fetch_request+0x14/0x19
[   43.531043]  [<c146db80>] redo_fd_request+0x70/0x27e
[   43.531054]  [<c103e5e3>] process_one_work+0x130/0x1f4
[   43.531056]  [<c146db10>] ? request_done+0x13e/0x13e
[   43.531058]  [<c103e90c>] worker_thread+0xfa/0x188
[   43.531061]  [<c103e812>] ? rescuer_thread+0x14a/0x14a
[   43.531066]  [<c1041c2b>] kthread+0x6e/0x73
[   43.531078]  [<c16b02b7>] ret_from_kernel_thread+0x1b/0x28
[   43.531082]  [<c1041bbd>] ? __kthread_parkme+0x54/0x54
[   43.531099] Code: eb 0c 03 51 20 8b 49 08 85 c9 75 e5 eb ec 85 d2 75 02 0f 0b 5b 89 d0 5e 5d c3 8b 10 8b 48 1c 39 c2 75 02 0f 0b 83 78 48 00 74 02 <0f> 0b 55 89 e5 53 8b 58 04 89 5a 04 89 13 8b 50 20 89 00 89 40
[   43.531104] EIP: [<c1279723>] blk_dequeue_request+0x11/0x4a SS:ESP 0068:cf8f3ef8

Thanks,
Fengguang

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