075

Explanation
A program running in supervisor state, key 0 issued
a SCHEDULE macro to schedule a service request block (SRB). The system
checked the acronym in the address space control block (ASCB) pointed
to by SRBASCB. The acronym failed the check. Possible reasons are: The issuer of the SCHEDULE macro put an incorrect address into
SRBASCB. Consequently, SRBASCB did not point to a valid ASCB.
SRBASCB pointed to a valid ASCB, but the ASCB has gone away normally
or abnormally.
SRBASCB pointed to a valid ASCB, but the ASCB was overlaid.

Register 14 contains the value from SRBASCB. Register
15 at the time of error points to the SRB that was being scheduled.

System action
The system ends processing of the SCHEDULE macro.
The system may write an SVC dump, a logrec data set error record,
or both.

Operator response
If the system programmer asks for an SVC dump,
set the following SLIP trap: SLIP SET,ENABLE,COMP=075,ACTION=SVCD,END

System programmer response
Do the following: If an SVC dump is not produced with the abend, ask
the operator to set a SLIP trap to obtain an SVC dump.
Examine SRBASCB to see if it contains a valid address.
Check for an incorrect address in the SRBASCB field. The address in
SRBASCB is not valid if: It is all zeros
It does not end in X'00' or X'80'
It is not an address in the system queue area (SQA)

 If the address in SRBASCB does not look like a valid address,
search problem reporting databases for a fix for the problem. If no
fix exists, contact the IBM® Support
Center. Provide all problem data collected.
If SRBASCB looks like a valid ASCB address, check the
address space vector table (ASVT) for this address. The ASVT contains
a list of ASCB addresses. The CVTASVT field of the communications
vector table (CVT) points to the ASVT. ASVTENTY begins the ASCB addresses.
Scan for the address that is in SRBASCB.
If the address in SRBASCB is in the ASVT, then the
ASCB pointed to by SRBASCB has been overlaid.  See if you recognize
the overlay by looking for any EBCDIC eye-catchers around the overlay.
Search problem reporting data bases for a fix for the problem. Include
in the search argument: EBCDIC eye-catcher that is a module name: PIDS/cccccccc
Abend X'075': AB/S075
Overlay of the ASCB: OVS/ASCB
The size and content of the overlay can also be added to
the search argument.
 If no fix exists, contact the supervisor
control component group at the IBM Support
Center. Provide data collected in previous steps and, if available,
the logrec data set error record.

If the address in SRBASCB cannot be found in the ASVT,
then either: The ASCB was deleted when the address space went away abnormally.
The ASCB went away normally.
The ASCB is not valid. The issuer of the SCHEDULE macro put a
bad address into SRBASCB.

Search problem reporting databases for a fix for the problem.
If no fix exists, contact the supervisor control component group at
the IBM Support Center. Provide
data collected in previous steps and, if available, the logrec data
set error record.

Source
Supervisor control