ZFS: Failed pool causes system to hang

[Quartz]

> I hadn't followed the entire discussion, but do you have the "failmode"
> zpool property set to "wait" (the default)?  If so, can you reproduce it
> with "failmode" set to "continue"?

Yes. Changing the failmode was the first thing research led me to try. 
"wait" hangs almost immediately while "continue" gives me some seconds 
to a minute and then hangs.

-STABLE has some new commits that will eventually panic the machine if 
this type of zfs hang goes on for too long, but that doesn't help me at 
all. (If I was ok with a panic, I'd set failmode to "panic" and be done 
with it).

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