Summary:  Kernel oops as listed below.  Other times, a complete system 
hang (no magic SysRq, etc) without anything output to the console. 
Sustained disk access is a known cause but it will happen during times 
of relative inactivity.

Oops Message:
Oops: 0000 [#1]
PREEMPT SMP
Modules linked in:
CPU: 0
EIP: 0060[<c01149ca>] Not tainted VLI
EFLAGS: 00010046 (2.6.15-gentoo-r1)
EIP is at do_page_fault +0x96/0x57a

Hardware:  8 SATA drives spread across two MV88SX50x1 controllers built 
into motherboard.

Software:  RAID-0 boot partitions (/dev/sd[a-h]1 -> /dev/md0).  8x 256Mb 
priority 1 swap partitions (/dev/sd[a-h]2).   RAID-5 / partition 
(/dev/sd[a-h]3 -> /dev/md1)

Relevant portion of `lspci`:
03:01.0 SCSI storage controller: Marvell Technology Group Ltd. 
MV88SX5081 8-port SATA I PCI-X Controller (rev 03)
03:04.0 SCSI storage controller: Marvell Technology Group Ltd. 
MV88SX5041 4-port SATA I PCI-X Controller (rev 03)

.config:  Attached

Snippets from `dmesg` (full dmesg available):
ata1: translated ATA stat/err 0xd0/00 to SCSI SK/ASC/ASCQ 0xb/47/00
ata1: status = 0xd0 { busy }
....
ATA: abnormal status 0xD0 on port 0xF90A211C


Please let me know what I can do to help in tracking this problem down. 
  Thank you all for all your hard work!