> The reason for the lack of replies is that no-one has much of an idea.
> This really looks like a hardware problem. The qi_submit_sync() is
> suggestive: it's the intel IOMMU mapping call ... have you tried
> reproducing this with the iommu disabled?
I turned off VT-d, and the problem went away.
I turned on VT-d, and turned off all of the sub-options:
Interrupt remapping
Coherency
ATS support
Pass-through DMA
and the problem remained.
So them I did a hail mary, and upgraded my GA-X79-UP4 from the F2 BIOS
to the beta F5c BIOS.
VT-d and all of the sub-features are turned on, and I'm on my 6th full
read pass over the entire RAID array (when it would crash before 15%
before), with no problem.
Hardware problem, indeed.
Thanks for the pointer; I wouldn't have thought of trying a BIOS
upgrade without it.
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