On Fri, 21 May 2010, Erik Cederstrand wrote:
Den 12/05/2010 kl. 22.44 skrev Jeff Roberson:
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
The LOR is actually safe. I need to bless the acquisition. We have
always acquired the buffers in this order.
The deadlocks people were seeing were actually livelocks due to
softdepflush looping indefinitely. I have committed a fix for that.
Thanks,
Jeff
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