Bind 9.3.0 on FreeBSD 5.3 exits with signal 11

Hi,

I've got a problem with Bind9.3.0 under the following circumstances:

- Server: Sun Fire V65x, 2 x Xeon 2,8Ghz (Running with Hyperthreading), 2 GB=

Ram
- OS: FreeBSD 5.3-STABLE, interface configured with two IPs
- 2 completly seperated instances of Bind 9.3.0 compiled from source,=
running
with uid bind and each listening on a different ip
- I've compiled bind with the following options:
--prefix=3D/usr/local/bind9/bind9-res1 \
--exec-prefix=3D/usr/local/bind9/bind9-res1 \
--with-openssl=3Dno

The Server is one of our caching-only-nameservers (serves only 3 zones and=
does
recursion otherwise) for our customers (in use for just about 3 days) and=
each
instance of bind processes about 500-1000 queries/s.
Everything works fine so far, but there is one major problem:
The instances of named exit with signal 11 and coredump approximately every=

14-18 hours always at times when the cache of each named has grown about 550=
mb
and the queries are at their peak (max. 1000 queries/s). What I've done so=
far
is to limit the max-cache-size to 500 mb and modify
recursive-clients/tcp-clients but without any effort.
Here are the relevant parts of the options-statement:

++++++++++++++++++++++++++++++++++++++++++
options {
listen-on { xxx.xxx.xxx.xxx; };
listen-on-v6 { none; };
directory "/usr/local/bind9/bind9-res1";
pid-file "named.pid";
allow-query { known_hosts; !any; };
allow-transfer { trusted; !any; };
blackhole { block; };
notify no;
recursive-clients 5000;
tcp-clients 500;
querylog no;
max-cache-size 500M;
};
++++++++++++++++++++++++++++++++++++++++++

Another thing that I've encountered with this version of bind is that if the=

cache has grown approximately every hour each instance of bind comsumes=
around
95% CPU for a short period (estimated 1-2 minutes) which produces a high=
load on
the server. During this time named answers only a limited number of queries=

(around 100-200 queries/s), the others probably will timeout.

Has anybody an idea to solve this issue? Any help or hints would be=
appreciated.

Kind Regards,

Dirk