Created attachment 324893 [details]
b2zipped core file

Description of problem:
host(1) segfaults for me when asking about certain servers, right before it should output MX records:

[root@ipa-server local]# host redhat.com
redhat.com has address 209.132.177.50
Segmentation fault

This is a virtual machine, using libvirt's NAT network config. I have bind running on that machine that provides DNS for my virtual machines, unknown requests are forwarded to libvirt's default DNS:
----
----

AFAIK the segfault occurs only for requests from outside - i.e. when the local bind forwards the request.

Version-Release number of selected component (if applicable):
bind-utils-9.5.0-35.P2.fc9.i386

How reproducible:
not always, but often enough.

Steps to Reproduce:
1. host redhat.com
  
Actual results:
segfault

Expected results:
no segfault

Additional info:
core file attached. gdb session:

(gdb) r redhat.com
Starting program: /usr/bin/host redhat.com
[Thread debugging using libthread_db enabled]
[New Thread 0xb8028b00 (LWP 2186)]
[New Thread 0xb7fe5b90 (LWP 2189)]
[New Thread 0xb75e4b90 (LWP 2190)]
[New Thread 0xb6be3b90 (LWP 2191)]
redhat.com has address 209.132.177.50

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7fe5b90 (LWP 2189)]
send_udp (query=0xffffffff) at dighost.c:2328
2328		l = query->lookup;
(gdb) p query
$1 = (dig_query_t *) 0xffffffff