The SVC abend condition manifested itself due to the XNET PXNPARM members not having a unique Prefix defined for PXNPARME and OFAPROC started tasks.
Specifying non-unique started tasks (STC ) identifiers can cause storage areas to be incorrectly released when identically “named” STCs all receive the same
stop command from z/OS. This particular STC encountered that condition and the STC shutdown processing was compromised in a way that prevented
shutdown completion. Modifying the PXNPARM members to have a unique Prefix for PXNPARME and OFAPROC started tasks will correct the Abend condition.