Symptom:
The ASA reloads and generates a traceback in thread name Dispatch Unit

Conditions:
1.  The ASA must have the Botnet Traffic Filter enabled
2.  Traffic passes through the ASA that is greylisted which triggers the ASA to update the Botnet Host Report (In other words, the traffic is sent to an IP that is also owned by pointed to by a domain name in the blacklist from a host previously not contained in the report)