ISG304I

Explanation
Global resource serialization requested a system
service, but the request failed.
In the message text: sysrec
is the name of the system service invoked by global resource serialization.
RC=rc
is the return code from the sysreq service.
RSN=rsn
is the reason code from the sysreq service.

System action
The system continues processing.  Another message
will be issued to indicate the result of the global resource serialization
function that invoked the service.

Operator response
Notify your system programmer.

System programmer response
Use the return code identified in
the message and the information associated with the follow-on message
to determine the cause of the error and correct the problem. See z/OS MVS Programming: Authorized Assembler Services Reference EDT-IXG,
or z/OS MVS Programming: Sysplex Services Reference.
If the information is not sufficient to determine the cause of the
error, contact the IBM® support center. 

Source
Global resource serialization

Module
ISGNST

Routing code
2,10

Descriptor code
12