On Tue, 13 Jan 2009, Pete French wrote:
I can't (fortunately) make it lock up. I have a DL360 G5 which is unused
atm. and can test on it if needed.
Would it be possible to install that under amd64 and hammer it with DNS
requests ? I have been trying to think what the difference might be between
my webservers and the machines which are freezing, and the opnly one I an
come up with is UDP traffic as the locking machines are serving DNS and also
NFS.
There are significant changes in UDP locking between 7.0 and 7.1, so it could
be that we're looking at a regression there. If you're able to reproduce this
reliably, it might well be worth doing a little search-and-replace in
udp_usrreq.c along the following lines:
INP_RLOCK_ASSERT -> INP_WLOCK_ASSERT
INP_RLOCK -> INP_WLOCK
INP_RUNLOCK -> INP_WUNLOCK
However, before making these changes for debugging purposes, make sure it's
100% reproduceable without them in the configuration so that we don't find
ourselves barking up the wrong tree. Normally deadlocks along these lines
*do* allow breaking into the debugger from a serial console, but since there
are significant changes here in 7.1 it is worth trying to see if this might be
related.
Robert N M Watson
Computer Laboratory
University of Cambridge
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