[CentOS] Centos-4 Kernel pannic

Hi all,

We are running a new Centos-4 server, and it has kernel panicked on us 4
times in the last month. After the first kernel panic we hooked up a
serial console to the server and captured the output in order to have a
record of what happens.  I've included the error messages from the last
time it locked up... but it doesn't really mean much to me. Anybody have
any ideas what might be causing this server lock up?

Server description:
-Dell PE1750 - dual 2.8Ghz Xeon (with Hyper Threading on) - 2GB DDR RAM
- Perc4-DI onboard RAID using 3 scsi drives in raid-5 configuration
-ext3 file system
-kernel-smp-2.6.9-5.0.3.EL
-mysql - from distribution
-2 postfix instances rebuilt with MySQL support
-amavisd-new
-clamav
-spamassassin
-rbldnsd
-bind


Here's the captured output from a serial console connected to the server
at time of fault.

Unable to handle kernel NULL pointer dereference at virtual address
00000000
 printing eip:
f8872da8
*pde = 35562001
Oops: 0000 [#1]
SMP 
Modules linked in: md5 ipv6 autofs4 sunrpc dm_mod button battery ac
ohci_hcd tg3 floppy sg ext3 jbd megaraid_mbox megaraid_mm sd_mod
scsi_mod
CPU:    1
EIP:    0060:[<f8872da8>]    Not tainted VLI
EFLAGS: 00010246   (2.6.9-5.0.3.ELsmp) 
EIP is at __journal_file_buffer+0x1b/0x221 [jbd]
eax: 00000000   ebx: d2fff26c   ecx: 00000008   edx: c2327680
esi: c2327680   edi: 00000008   ebp: 00000000   esp: f7533dd4
ds: 007b   es: 007b   ss: 0068
Process kjournald (pid: 210, threadinfo=f7533000 task=f75825b0)
Stack: 00000000 00000000 f148fad8 f7f66200 d2fff26c c2327680 f887351b
00000286 
       00000000 00000000 00000000 00000000 00000000 d2517e6c f7f66200
caa4c50c 
       00001f18 00000000 f75825b0 c011e8d2 f7533e44 f7533e44 f750c054
f8836f24 
Call Trace:
 [<f887351b>] journal_commit_transaction+0x310/0xfb1 [jbd]
 [<c011e8d2>] autoremove_wake_function+0x0/0x2d
 [<f8836f24>] megaraid_isr+0x1ad/0x1bf [megaraid_mbox]
 [<c011e8d2>] autoremove_wake_function+0x0/0x2d
 [<c011bcd5>] finish_task_switch+0x30/0x66
 [<c02c4363>] schedule+0x833/0x869
 [<c0127e62>] del_timer_sync+0x7a/0x9c
 [<f8875e6d>] kjournald+0xc7/0x215 [jbd]
 [<c011e8d2>] autoremove_wake_function+0x0/0x2d
 [<c011e8d2>] autoremove_wake_function+0x0/0x2d
 [<c011bd1d>] schedule_tail+0x12/0x55
 [<f8875da0>] commit_timeout+0x0/0x5 [jbd]
 [<f8875da6>] kjournald+0x0/0x215 [jbd]
 [<c01041f1>] kernel_thread_helper+0x5/0xb
Code: 14 ba 01 00 00 00 83 c4 10 89 d0 5b 5e 5f 5d c3 55 31 ed 57 89 cf
56 89 d6 53 53 53 89 c3 c7 44 24 04 00 00 00 00 8b 00 89 04 24 <8b> 00
a9 00 00 08 00 75 29 68 d4 85 87 f8 68 9b 07 00 00 68 55 


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