mysterious wedges in bind9

[travis+ml-bind at subspacefield.org]

Hello,

My primary bind9 name server which does double-duty as a server and recursive lookup
is becoming "wedged" where it does not respond to queries or stop events from rndc.
Sending SIGTERM does not work; I have to SIGKILL (kill -9) it.

Package info:
ii  bind9                 1:9.5.0.dfsg.P2-1ubun Internet Domain Name Server

OS:
Ubuntu 8.10

Needless to say, this is causing me a headache.  When it's down, SSH operations
take over a minute.

Strangely, I have an identical server which slaves all the same domains but does
not ever exhibit this behavior.

What can/should I do to troubleshoot this?

Thanks in advance!
-- 
Obama Nation | My emails do not have attachments; it's a digital signature
that your mail program doesn't understand. | http://www.subspacefield.org/~travis/ 
If you are a spammer, please email john at subspacefield.org to get blacklisted.
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