[Unbound-users] Unbound periodically stops responding

Alexander Clouter alex at digriz.org.uk
Wed Apr 6 07:38:29 UTC 2011

W.C.A. Wijngaards <wouter at nlnetlabs.nl> wrote:
> So, it is somehow unique to that machine.  Can you see in 'top' what
> unbound is doing?  (is it using cpu, 100% in a busy loop?, it is not
> responding to unbound-control, so it must be completely hosed somehow)
...the sysadmin in me usually reaches for 'strace' at this point for 
> Another thing you can do is use 'gcore' to make a coredump of the
> 'failed' unbound process.  (and then kill it and start a new unbound for
> your production).  Then you can use 'gdb' and your compiled unbound
> executable to read the core image and produce a stack backtrace what it
> is doing.
...and when strace fails me, gdb is "bring out the cannon".

Alexander Clouter
.sigmonster says: There is no fool to the old fool.
                  		-- John Heywood

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