linux-kernel - Re: 2.6.21-mm1

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Message-Id: <20070506135403.a6785f7d.akpm@linux-foundation.org>
Date:	Sun, 6 May 2007 13:54:03 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Simon Arlott <simon@...e.lp0.eu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.21-mm1

On Sun, 06 May 2007 21:36:32 +0100 Simon Arlott <simon@...e.lp0.eu> wrote:

> On 05/05/07 09:49, Andrew Morton wrote:
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21/2.6.21-mm1/
> 
> Not sure exactly what's going on here, but it happened with a lock held on my 
> (XFS) filesystem while compiling part of the kernel because I can't do anything 
> with it now.
> 
> [ 1128.122000] BUG: sleeping function called from invalid context at block/cfq-iosched.c:1895
> [ 1128.122000] in_atomic():1, irqs_disabled():0
> [ 1128.122000] INFO: lockdep is turned off.
> [ 1128.122000] BUG: unable to handle kernel paging request at virtual address 8b0c4034
> [ 1128.122000]  printing eip:
> [ 1128.122000] b0104e36
> [ 1128.123000] *pde = 00000000
> [ 1128.123000] Oops: 0000 [#1]
> [ 1128.123000] PREEMPT
> [ 1128.123000] Modules linked in: drbd mt352 saa7134_dvb dvb_pll video_buf_dvb dvb_core
> [ 1128.123000] CPU:    0
> [ 1128.123000] EIP:    0060:[<b0104e36>]    Not tainted VLI
> [ 1128.123000] EFLAGS: 00010246   (2.6.21-git #195)
> [ 1128.123000] EIP is at dump_trace+0x66/0xb0
> [ 1128.123000] eax: 00000000   ebx: b18f6fd0   ecx: b06323ec   edx: b05afc71
> [ 1128.123000] esi: 8b0c4000   edi: 8b0c4ffd   ebp: b18f6fd0   esp: b18f6fb8
> [ 1128.123000] ds: 007b   es: 007b   fs: 0000  gs: 0000  ss: 0068
> [ 1128.123000] Process pdflush (pid: 186, ti=b18f6000 task=eff88b10 task.ti=b18f7000)
> [ 1128.123000] Stack: b000205d 00000000 fffffffc b05b9937 efd1adb4 00000010 b18f6ff0 b0104f3a
> [ 1128.123000]        b06323ec b05b9937 00000000 b05d33e6 efd1adb4 b05d33e6 b18f7000 b0104f62
> [ 1128.123000]        b05b9937 b18f700c
> [ 1128.123000] Call Trace:
> [ 1128.123000]  [<b0104f3a>] show_trace_log_lvl+0x1a/0x30
> [ 1128.123000]  [<b0104ffb>] show_stack_log_lvl+0x8b/0xb0
> [ 1128.123000]  [<b0105243>] show_registers+0x1c3/0x320
> [ 1128.123000]  [<b0105525>] die+0x105/0x230
> [ 1128.123000]  [<b011703f>] do_page_fault+0x2cf/0x5b0
> [ 1128.123000]  [<b04eae3a>] error_code+0x6a/0x70
> [ 1128.123000]  [<b0104f3a>] show_trace_log_lvl+0x1a/0x30
> [ 1128.123000]  [<b0104f62>] show_trace+0x12/0x20
> [ 1128.123000]  =======================
> [ 1128.123000] Code: 18 8b 4d 08 8b 45 0c 8b 53 04 ff 51 08 8b 03 39 d8 76 06 89 c3 39 f3 77 e4 8b 4d 08 ba 71 fc 5a b0 8b 45 0c ff 51 0c 85 c0 78 38 <8b> 76 34 85 f6 74 31 8d 76 00 e8 bb d7 00 00 eb b3 89 eb eb af
> [ 1128.123000] EIP: [<b0104e36>] dump_trace+0x66/0xb0 SS:ESP 0068:b18f6fb8

Mess.  Someone incorrectly called the IO scheduler under a spinlock (or
similar), CFQ tried to do a dump_stack(), but the dump_stack() code
exploded.  Usually this happens when the x86_64 tree contains stacktrace
improvements, but the unwinder (at least) wasn't present in -mm1.

How come those addresses are 0xb0......, btw?  You're running a different
vm split?


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