644

Explanation
The error occurred during the processing of SYNADAF,
where it was determined that the message buffer obtained in the user's
region had been modified or freed.

System programmer response
If the error recurs and the program
is not in error, look at the messages in the job log for more information.
Search problem reporting data bases for a fix for the problem. If
no fix exists, contact the IBM® Support
Center. Provide the JCL and the program listing for the job.

Programmer response
Register 15 contains the address of the
message buffer area.  Make sure that your program does not modify
or free this area until SYNADAF processing is complete.  Correct the
error and rerun the job step.

Source
DFSMSdfp