Report: ZFS deadlock in 9-STABLE

[Travis Mikalson]

Andriy Gapon wrote:
> on 03/07/2013 19:40 Travis Mikalson said the following:
>> Hello,
>>
>> To cut to the chase, I have a procstat -kk -a captured during a livelock
>> for you here:
>> http://tog.net/freebsd/zfsdeadlock-storage1-20130703
> 
> BTW, https://wiki.freebsd.org/AvgZfsDeadlockDebug
> 
> "If neither of the above is true. That is, you do see zio_wait and you don't see
> either of zio_done or zio_interrupt, then the problem is most likely with the
> storage layer..."

Yes, that helpful article is where I got the run-down on how best to
report what was going on here. I still believe this is an actual
deadlock bug and not a storage layer issue.

I have not seen any indications of any problems with my storage layer.
You'd think there would be some scary-looking complaint on the console
during one of these deadlocks if it had suddenly lost the capability to
communicate with most or all the disks, but I've deadlocked at least 10
times now in 2013 and never anything of the sort. Thanks to IPMI, I have
actually viewed the console each time it has happened.