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2.6.23.1 NULL pointer dereference in NFS

Previous thread: [patch 4/4] Move Kconfig.instrumentation to arch/Kconfig and init/Kconfig by Mathieu Desnoyers on Tuesday, November 6, 2007 - 4:37 pm. (3 messages)

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[view original message]
From: Mathieu Desnoyers <mathieu.desnoyers@...>
To: <linux-kernel@...>
Subject: 2.6.23.1 NULL pointer dereference in NFS
Date: Tuesday, November 6, 2007 - 4:48 pm

Hi,


I just ran through this OOPS when I was doing a dpkg dist-upgrade on my

Pentium III. Any idea what could have caused this ?


(by the way, this computer is generally slow since I upgraded to

2.6.23.1. It could be a related symptom...)


BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000

 printing eip:

c54a53cf

*pde = 00000000

Oops: 0002 [#1]

PREEMPT

Modules linked in: mga_vid fuse rt2570 iptable_filter ip_tables x_tables tun mga drm uhci_hcd 3c59x mii via_agp thermal usbcore button agpgart processor

CPU:    0

   Not tainted VLI

EFLAGS: 00210202   (2.6.23.1 #1)

EIP is at 0xc54a53cf

eax: c54a5344   ebx: c54a5344   ecx: 00000000   edx: c54a5378

esi: 00000000   edi: c54a53ac   ebp: c54a5474   esp: dfedbc34

ds: 007b   es: 007b   fs: 0000  gs: 0033  ss: 0068

Process xmms (pid: 1337, ti=dfeda000 task=e0602000 task.ti=dfeda000)

Stack: c041dcc8 00000001 c54a5344 c54a54b8 c54a5344 c54a5344 c54a54b8 e75b6c00

       c01f364e 00000000 00000000 c54a5340 c54a54b8 dfedbd54 c01f37c0 00002000

       00000000 00002000 dfedbd54 c136bb20 00003000 c01f19b2 00002000 00000000

Call Trace:

__rpc_execute+0x5b/0x21f

nfs_execute_read+0x30/0x3f

nfs_pagein_one+0x99/0xd0

nfs_pageio_doio+0x2e/0x54

nfs_pageio_add_request+0x98/0xa9

readpage_async_filler+0x117/0x134

readpage_async_filler+0x0/0x134

read_cache_pages+0x6a/0xb4

nfs_readpages+0x124/0x173

nfs_pagein_one+0x0/0xd0

nfs_readpages+0x0/0x173

__do_page_cache_readahead+0x19b/0x260

update_curr+0x102/0x12c

ondemand_readahead+0x48/0xee

page_cache_sync_readahead+0x2a/0x2f

do_generic_mapping_read+0xd8/0x3d0

__check_preempt_curr_fair+0x4f/0x7c

generic_file_aio_read+0x152/0x181

file_read_actor+0x0/0xd7

do_sync_read+0x0/0x109

do_sync_read+0xc6/0x109

autoremove_wake_function+0x0/0x33

do_sync_read+0x0/0x109

vfs_read+0xa6/0x128

sys_read+0x41/0x67

syscall_call+0x7/0xb

 =======================

Code: a4 53 4a c5 a4 53 4a c5 c1 cf 50 d7 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1e 06 00 00 ...
[ message continues ]
[view original message]
From: Trond Myklebust <trond.myklebust@...>
To: Mathieu Desnoyers <mathieu.desnoyers@...>
Cc: <linux-kernel@...>
Subject: Re: 2.6.23.1 NULL pointer dereference in NFS
Date: Wednesday, November 7, 2007 - 9:32 am

That is a lot of zeros... Did you perchance compile this kernel over NFS

using kernel 2.6.23 or 2.6.23.1? There is a known writeback bug that

results in that kind of corruption. See


   http://bugzilla.kernel.org/show_bug.cgi?id=9315


Cheers

  Trond


-
[view original message]
From: Mathieu Desnoyers <mathieu.desnoyers@...>
To: Trond Myklebust <trond.myklebust@...>
Cc: <linux-kernel@...>
Subject: Re: 2.6.23.1 NULL pointer dereference in NFS
Date: Wednesday, November 7, 2007 - 9:44 am

Nope, it was compiled locally on an ext3 partition.


When the oops happened, I was also reading a flac file from an NFS

server using xmms, which is liklely to be what was causing the NFS

traffic.


--

Mathieu Desnoyers

Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal

OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

-
[view original message]
From: Mathieu Desnoyers <compudj@...>
To: Trond Myklebust <trond.myklebust@...>
Cc: <linux-kernel@...>
Subject: Re: 2.6.23.1 NULL pointer dereference in NFS
Date: Wednesday, November 7, 2007 - 10:38 am

Oh, wait.. what am I saying.. my old PIII was way too slow to compile,

so I switched to compile over NFS. The server was a 2.6.17.14 and the

client a 2.6.21.1.


So that may be the problem. I'll recompile locally.


Thanks,


--

Mathieu Desnoyers

Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal

OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

-
Previous thread: [patch 4/4] Move Kconfig.instrumentation to arch/Kconfig and init/Kconfig by Mathieu Desnoyers on Tuesday, November 6, 2007 - 4:37 pm. (3 messages)

Next thread: KVM paravirt clocksource - Take 3 out of <put your number here> by Glauber de Oliveira Costa on Tuesday, November 6, 2007 - 6:18 pm. (16 messages)