If a box running Bro doesn't have correctly configured DNS it causes a backup of DNS resolution requests. It looks like the requests aren't timing out quickly enough. We probably need to deal with this one way or another since a failing DNS server should not result in Bro crashing. Maybe we could move more control of Bro's DNS resolution into scriptland? If we had a boolean value that we could flip on or off to enable/disable DNS resolution? Right now we only have the environment variable which is not flexible enough to deal with situations like this.