Problem:

Running ES MTO - an abend occurred and the CICS was creating a dump. It hung the whole system and took like 2 hours.

Resolution:

In this case - the faultfind utility had been turned on

Faultfind should NOT be used with  ES MTO

This is a feature for debugging regular pc and cgi applications.

ES MTO has its own dumping facility and the two conflict with each other for resources.