Running Batch Reports in Mainframe Application Tuner (MAT) 10.0 is resulting in a S878 Abend.
If you attempt to monitor a job that may be spinning off a lot secondary address spaces and CA MAT is trying to fire up a measurement for each and every one of them, this error can occur. This would be the APAR to handle this error: RO84616
++PTF (RO84616)
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S878 DUE TO MONITORING SPAWNED USS PROCESSES
PROBLEM DESCRIPTION:
When measuring an address space that spawns additional USS processes,
CA MAT starts measurements for these address spaces too. This is a useful
feature, but if the address space being measured spawns a high number of
processes the CA MAT server can be overloaded with monitoring requests
and run out of memory in a subpool. The PTF makes this feature optional.
SYMPTOMS:
S878 or similar abend, or S40D abend if memory ran out during recovery