On Fri, 16 Jan 2009, Pete French wrote:
hi, please type: show lock 0xffffff0001254d20 and then show thread
0xXXXXXXXXXXX where XXXXX is 'owner' of previous output.
http://toybox.twisted.org.uk/~pete/71_pdns_lock.png
That's in Power DNS - which is interesting because the one difference
between the boxes that lock and those which dont is that the locking ones
are serving DNS.
I rather feared as much. Let's run down the path of "perhaps there's a
problem with the new UDP locking code" for a bit and see where it takes us.
Is it possible to run those boxes with WITNESS -- I believe that the fact that
"show alllocks" is failing is because WITNESS isn't present. The other thing
we can do is revert UDP to using purely write locks -- the risk there is that
it might change the timing but not actually resolve the bug, so if we can
analyze it a bit using WITNESS first that would be useful.
Robert N M Watson
Computer Laboratory
University of Cambridge
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