oops with 2.4.8-xfs

["Bernhard R. Erdmann" <be@berdmann.de>]

Hi,

this evening I got a complete system lockup with kernel 2.4.8-xfs CVS
checkout of this morning. It locked up as soon as I started xfsdump on a
filesystem.

Afterwards, I found in /var/log/warn:

Aug 14 19:48:29 hostname kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000000
Aug 14 19:48:29 hostname kernel:  printing eip:
Aug 14 19:48:29 hostname kernel: c0137569
Aug 14 19:48:29 hostname kernel: *pde = 00000000
Aug 14 19:48:29 hostname kernel: Oops: 0000
Aug 14 19:48:29 hostname kernel: CPU:    1
Aug 14 19:48:29 hostname kernel: EIP:    0010:[mangle+17/148]
Aug 14 19:48:29 hostname kernel: EFLAGS: 00010292
Aug 14 19:48:29 hostname kernel: eax: 00000000   ebx: 0000007e   ecx:
00000000   edx: dec3b07e
Aug 14 19:48:29 hostname kernel: esi: c1889ea0   edi: c188df60   ebp:
dec3b07e   esp: ded39edc
Aug 14 19:48:29 hostname kernel: ds: 0018   es: 0018   ss: 0018
Aug 14 19:48:29 hostname kernel: Process df (pid: 8471,
stackpage=ded39000)
Aug 14 19:48:29 hostname kernel: Stack: 0000007e c1889ea0 c188df60
c188df60 ffffffff c01377b1 c01377b9 00000000 
Aug 14 19:48:29 hostname kernel:        dec3b07e 00000eba ded2effb
dec3b079 00000ebf df83ff20 dec3b06c 00000ecc 
Aug 14 19:48:29 hostname kernel:        ded39f94 00000c00 dec3b000
00000000 ded2effb ded38000 dffce440 dffdaea0 
Aug 14 19:48:29 hostname kernel: Call Trace:
[get_filesystem_info+453/1088] [get_filesystem_info+461/1088]
[mounts_read_proc+26/52] [proc_file_read+242/404] [sys_read+143/196]
[system_call+51/56] 
Aug 14 19:48:29 hostname kernel: 
Aug 14 19:48:29 hostname kernel: Code: 80 39 00 74 71 8b 44 24 24 83 c0
fd 89 44 24 10 85 c0 7e 62 

It happened three times after a subsequential reboot. After downgrading
to 2.4.7-xfs, the problem disappeared.

The system is a dual PIII-1000. Any clue?

# lspci
00:00.0 Host bridge: VIA Technologies, Inc. VT82C693A/694x [Apollo
PRO133x] (rev c4)
00:01.0 PCI bridge: VIA Technologies, Inc. VT82C598/694x [Apollo
MVP3/Pro133x AGP]
00:07.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South]
(rev 40)
00:07.1 IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 06)
00:07.4 Host bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI]
(rev 40)
00:0e.0 PCI bridge: Distributed Processing Technology PCI Bridge (rev
02)
00:0e.1 I2O: Distributed Processing Technology SmartRAID V Controller
(rev 02)
00:10.0 Ethernet controller: 3Com Corporation 3c905C-TX [Fast Etherlink]
(rev 74)
01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS]
86C326 (rev 0b)