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User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.7) Gecko/20050416 Fedora/1.0.3-1.3.1 Firefox/1.0.3

Description of problem:
A backup server, which runs uses rsync to copy data from a netapp filer to a locally attached RAID disk array, kernel panicked in the middle of the night.  The system was power cycled and came back online normally afterwards.  An error message similar to this appeared on the console after the panic:

unable to handle null pointer null reference 6c
recursive die failure output supressed 
kernel panic not syncing fatal exception in interrupt

From /var/log/messages:

May  3 03:00:55 radm201p kernel: ------------[ cut here ]------------
May  3 03:00:55 radm201p kernel: kernel BUG at kernel/exit.c:842!
May  3 03:00:55 radm201p kernel: invalid operand: 0000 [#1]
May  3 03:00:55 radm201p kernel: SMP
May  3 03:00:55 radm201p kernel: Modules linked in: md5 ipv6 i2c_dev i2c_core nfs lockd sunrpc dm_mod button battery ac e1000 floppy sg ext3 jbd raid1 aic7xxx sd_mod scsi_mod
May  3 03:00:55 radm201p kernel: CPU:    1

Version-Release number of selected component (if applicable):
kernel-smp-2.6.9-5.EL

How reproducible:
Didn't try


Additional info:

May  3 03:00:55 radm201p kernel: ------------[ cut here ]------------
May  3 03:00:55 radm201p kernel: kernel BUG at kernel/exit.c:842!
May  3 03:00:55 radm201p kernel: invalid operand: 0000 [#1]
May  3 03:00:55 radm201p kernel: SMP
May  3 03:00:55 radm201p kernel: Modules linked in: md5 ipv6 i2c_dev i2c_core nfs lockd sunrpc dm_mod button battery ac e1000 floppy sg ext3 jbd raid1 aic7xxx sd_mod scsi_mod
May  3 03:00:55 radm201p kernel: CPU:    1