07B

Explanation
The system detected an error in interprocessor
communications (IPC). A hexadecimal reason code in register 15 explains
the error: Code
Explanation
00
For a RISGNL macro, the caller passed an incorrect physical configuration
communications area (PCCA) address. Registers 2 and 3 contain the
values of registers 0 and 1 that were input from the caller.
04
For a RPSGNL macro, the caller passed an incorrect PCCA address.
Registers 2 and 3 contain the values of registers 0 and 1 that were
input from the caller.
08
For a DSGNL macro, the caller passed an incorrect PCCA address.
Registers 2 and 3 contain the values of registers 0 and 1 that were
input from the caller.
0C
For a RISGNL macro, the caller's serial receiving routine abnormally
ended on the processor processing the emergency signal interrupt.
Registers 2 and 3 contain the values of registers 0 and 1 that were
input from the caller.
10
The emergency signal second level interrupt handler (SLIH) detected
second level recursion.
14
For a DSGNL macro, the caller passed an incorrect order code for
the SIGP instruction. This order code is not supported.

System action
One of the following: For reason code X'00', X'04', X'08', X'0C',
or X'14', the system abnormally ends the caller.
For reason code X'10', the system writes a logrec data
set error record.

Operator response
If the system programmer asks for an SVC dump,
set the following SLIP trap: SLIP SET,COMP=07B,ACTION=SVCD,END

System programmer response
Do the following: If a logrec data set error record is not produced with
the abend, ask the operator to set a SLIP trap to obtain an SVC dump.
Use the address in register 14 at the time of error
to identify the module that issued the macro or caused the emergency
signal interruption. For an installation-provided module, continue diagnosis with the
module.
For an IBM® module, search
problem reporting data bases for a fix for the problem. If no fix
exists, contact the component group associated with this module at
the IBM Support Center. Provide,
if available, the SVC dump and the logrec data set error record.

Source
Supervisor control