zfs deadlock

[gitboy]

Not too sure how concerned to be about;

https://gist.github.com/gitboy/d6ecb398407818733996

A few of my processes hung but then eventually resumed, I'm not sure if this is a problem
with the LUNs that comprise the zpools or it's a zfs bug.

[dweeezil]

@gitboy I have a feeling you're looking at a problem caused by 3.13's change to the semantics of kthread_create_on_node. Please try the latest patch listed in openzfs/spl#340.

[behlendorf]

Since we don't have quite enough to go on here and there are several other more detailed issues open with similar symptoms I'd like to close this out for now.