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From: Marcin Cieslak <saper@saper.info>
Date: Wed, 17 Feb 2010 23:26:36 +0000 (UTC)
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Subject: ZFS DEADLKRES
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My r203753 amd64 laptop falls into the deadlock situation
every night while running periodic daily script. I am pretty
certain this is related to ZFS. 

I have enabled DEADLKRES in the kernel. I even have 
a separate dump partition (not used for swap).

Indeed, the kernel deadlock detector gets triggered
during the periodic run, but I get I/O error when
calling doadump() from DDB.

Dumping works properly when DDB is invoked with keyboard
escape.  

What's the best way to troubleshoot this deadlock?
Should I try to transcribe "alltrace" output?

-- 
              << Marcin Cieslak // saper@saper.info >>