kernel panic

["febo@delenda.net" <febo@delenda.net>]

Running a stock FC5 kernel with a P4 and HT enabled..
After 1 month uptime with no problems I get this out of the blue. The
system practically hanged, only ICMP was working, had to reboot.Could
it be related to cpuspeed or amavisd (the latter seems unlikely)... ?

Aug 24 12:43:07 mail kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000051
Aug 24 12:43:07 mail kernel:  printing eip:
Aug 24 12:43:07 mail kernel: c01467fb
Aug 24 12:43:07 mail kernel: *pde = 03162001
Aug 24 12:43:07 mail kernel: Oops: 0000 [#1]
Aug 24 12:43:07 mail kernel: SMP
Aug 24 12:43:07 mail kernel: last sysfs file:
/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
Aug 24 12:43:07 mail kernel: Modules linked [..]
Aug 24 12:43:07 mail kernel: CPU:    0
Aug 24 12:43:07 mail kernel: EIP:    0060:[<c01467fb>]    Not tainted VLI
Aug 24 12:43:07 mail kernel: EFLAGS: 00210002   (2.6.15-1.2054_FC5smp #1)
[..]
Aug 24 12:43:07 mail kernel: Process amavisd (pid: 22608,
threadinfo=e9358000 task=f7d1ba30)
[..]
Aug 24 12:43:07 mail kernel: Call Trace:
Aug 24 12:43:07 mail kernel:  [<c0163762>]
__find_get_block_slow+0x38/0x114     [<c016422c>]
[..]
Aug 24 12:43:08 mail kernel: Code: 89 d8 5a 5b 5e 5f 5d c3 57 56 53 89
c3 89 d6 8d 78 10 89 f8 e8 82 ba 1a 00 83 c3 04 89 f2 89 d8 e8 53 cb
08 00 89 c3 85 c0 74 10 <8b> 00 89 da f6 c4 40 74 03 8b 53 0c f0 ff 42
04 89 f8 e8 ef b9
Aug 24 12:43:08 mail kernel: Continuing in 120 seconds... Continuing
in 1 seconds.
Aug 24 12:43:08 mail kernel:  <3>Debug: sleeping function called from invalid
[..]
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