netdev - iscsi related softlockup (3.0 rc3)

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Message-ID: <20110620200059.GA21401@redhat.com>
Date:	Mon, 20 Jun 2011 16:00:59 -0400
From:	Dave Jones <davej@...hat.com>
To:	netdev@...r.kernel.org
Subject: iscsi related softlockup (3.0 rc3)

I made some changes to my syscall fuzzer as it hasn't been turning up anything
interesting since the last lot of problems got fixed.  I seem to have found
a way to get iscsi really confused, to the point that the soft-lockup detector
kicks in, and then the rcu stall detector.

http://davej.fedorapeople.org/iscsi-lockup.txt is the dmesg from the box.
sysrq was working, but I couldn't ssh into the box, or even log in on the console.
I had ssh sessions already logged into the box which were completely wedged.

I don't have any iscsi setup configured on this machine, the fuzzer just hit upon
that protocol randomly.  If it wasn't for the fact that the machine wedged I wouldn't
be overly concerned, but it seems that something got into a state that just consumed
all cpu time.

	Dave

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