named won't start anymore

[Bastian.Zacher at aspect-online.de]

Hello NG,

my named server won't run anymore. It produces a core-dump right after 
starting and terminates itself.
Neither a upgrade nor any changes to the configuration was done.

here are the last lines of named.log:

Sep 13 11:36:19.221 general: zone_timer: zone authors.bind/CH: enter
Sep 13 11:36:19.221 general: zone_maintenance: zone authors.bind/CH: enter
Sep 13 11:36:19.562 client: client 10.28.1.7#33927: UDP request
Sep 13 11:36:19.562 security: client 10.28.1.7#33927: request is not 
signed
Sep 13 11:36:19.562 security: client 10.28.1.7#33927: recursion available: 
approved
Sep 13 11:36:19.562 client: client 10.28.1.7#33927: query

How can i discover the problem, rndc won't run!

Thanks

bastian