I found bug #232017 which sounds very similar to me. Setting swiotlb=128 fixed 
the problem in this case. I get an error similar to swiotlb=force. For values 
of 64 and 16 I get "BUG: soft lockup - CPU#1 stuck for 11s!", while 16 seems a 
bit more stable.
With swiotlb=0, 2 or 8 I am back to the original kernel bug.
I searched for the "soft lockup" bug, but couldn't find anything useful so far. 
acpi=off does not help. Somewhere a kernel >= 2.6.25 was suggested... - not 
sure if it is worth trying to compile.
Most reports are X related, but I don't have X on the machine.

I'll keep on digging!


** Attachment added: "swiotlb_le128.tgz"
   http://launchpadlibrarian.net/16363800/swiotlb_le128.tgz

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linux-image-2.6.24-* w/ aic79xx crash under heavy I/O load
https://bugs.launchpad.net/bugs/238118
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