On 03/16/2013 03:31 PM, Vernon Schryver wrote:
To debug and so have the least hope of eventually fixing this or any similar problem, I would build BIND with -g and capture a core file and associated libraries for a hung example,. Whether your guess blaming RPZ is right or wrong, no progess is likely to be made without a core file.
It's unfortunate I wasn't able to obtain one; gdb wasn't installed on the box, and I couldn't get the package installed because DNS was down.
Sadly, I can't say I'm optimistic about getting a core file, since we're now running with RPZ disabled.
I will see if I can reproduce it on the bench with a synthetic RPZ and query load, but re-enabling on our production NSes is a no-go in the short term (and might not work anyway, if it's related to the serial number / bulk update stuff that Simon has referred to in his email).
Obviously if we're "lucky" and it happens again (with RPZ disabled or otherwise) then I'll grab a core, as gdb and the debug symbols for our binary are now installed.
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