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From: Erik Cederstrand <erik@cederstrand.dk>
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Date: Fri, 21 May 2010 02:34:05 +0200
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To: Jeff Roberson <jroberson@jroberson.net>
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Cc: Attilio Rao <attilio@freebsd.org>, current@freebsd.org,
	Peter Jeremy <peterjeremy@acm.org>
Subject: Re: LOR: ufs vs bufwait
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Den 12/05/2010 kl. 22.44 skrev Jeff Roberson:
>=20
> I think Peter Holm also saw this once while we were testing SUJ and =
reproduced ~30 second hangs with stock sources.  At this point we need =
to brainstorm ideas for adding debugging instrumentation and come up =
with the quickest possible repro.

FWIW, I get this LOR on a ClangBSD virtual machine running the stess2 =
test suite.

I can reproduce the LOR reliably like this:

# cd stress2
#./run.sh lockf.cfg
 - press ctrl-C
 - another LOR is triggered by the ctrl-C (a dirhash/bufwait LOR =
described in kern/137852)
# ./run.sh mkdir.cfg
 - LOR is triggered immediately

Erik=

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