Panic after hung rsync, probably zfs related

[Ben Stuyts]

On 14 mei 2008, at 10:15, Kris Kennaway wrote:

>> | While doing an rsync from a zfs filesystem to an external usb hd  
>> (also
>> | zfs), the rsync processes hung in zfs state. I could not kill these
>> | processes, although the rest of the server seemingly continued to  
>> run
>> | fine. The reboot command did not work. Next I tried a shutdown now
>> | command. This caused a panic:
>> Sound like you somehow run out of memory, there is an known issue  
>> with
>> ZFS which causes livelock when there is memory pressure.  Which rsync
>> version are you using?  With rsync 3.x the memory usage would drop
>> drastically which would help to prevent this from happening.
>
> This isn't known to cause a double fault though.  Unfortunately we  
> probably need more information than was available in order to proceed.

Yes, I agree. But I don't know what to do in this sort of case where  
the machine is completely wedged.

Ben