ZFS related kernel panic

[Alexander Motin]

Andriy Gapon wrote:
> on 16/09/2010 13:58 Alexander Motin said the following:
>> Thanks to console access provided, I have found the reason of crash.
>> Attached patch should fix it. Patched system successfully runs the
>> stress test for 45 minutes now, comparing to crashing in few minutes
>> without it.
>>
>> Also I've found that timeouts reported by the driver are not fatal.
>> Affected commands are correctly completing as soon as after detecting
>> time out driver freezes new incoming requests to resolve situation, and
>> as result, idling the bus. ones. These timeouts I think caused by some
>> congestion on SATA interface, that probably caused by port multiplier.
>> This panic could be triggered only by such fake timeouts, not the real
> 
> Can the same happen with ahci (in theory)?

Yes, but only on AHCI controllers with FIS-based switching support. At
this moment there is only one such chip - 6Gbps Marvell 88SE912x. Same
patch should apply ahci(4) also.

-- 
Alexander Motin