MVS Agent terminates with Abend 0C4 in Module UCXJM25 at offset 00086E7E with reason code 10

Products

• CA Automic Workload Automation - Automation Engine
• CA Automic One Automation

Issue/Introduction

The MVS Agent 21.0.5 on z/OS V2R5 terminates with Abend 0C4 in Module UCXJM25 at offset 00086E7E with reason code 10.

Example:

19.01.50 JOB18253  IRR010I  USERID L0INTR   IS ASSIGNED TO THIS JOB.
19.01.50 JOB18254  $HASP100 H0829126 ON INTRDR      AG4ASV/0829/ANLASS    FROM STC16574 UC4RUN
19.01.50 JOB18254  IRR010I  USERID L0INTR   IS ASSIGNED TO THIS JOB.
19.02.04 STC16574  IEA995I SYMPTOM DUMP OUTPUT  916
   916             SYSTEM COMPLETION CODE=0C4  REASON CODE=00000010
   916              TIME=19.01.51  SEQ=37839  CPU=0000  ASID=02AA
   916              PSW AT TIME OF ERROR  078D1400   8008EB3E  ILC 4  INTC 10
   916                ACTIVE MODULE           ADDRESS=00000000_00007CC0  OFFSET=00086E7E
   916                NAME=UCXJM25
   916                DATA AT PSW  0008EB38 - 4110D098  0DEF5800  201495F1
   916                GR 0: 00000000_00091806   1: 00000000_8008BADA
   916                   2: 00000000_26C18080   3: 00000000_0008EB8E
   916                   4: 00000000_25460038   5: 00000000_0001F4B0
   916                   6: 00000000_25478CC0   7: 0000004E_254A3A98
   916                   8: 00000000_254A3AA0   9: 00000000_254A3360
   916                   A: 00000000_26C18080   B: 00000000_000917D8
   916                   C: 00000000_001D30C0   D: 00000000_254A3D60
   916                   E: 00000000_8008EB3E   F: 00000000_0009185A
   916              END OF SYMPTOM DUMP
19.02.04 STC16574  BPXP018I THREAD 259CB80000000001, IN PROCESS 16845780, ENDED  917
   917             WITHOUT BEING UNDUBBED WITH COMPLETION CODE 840C4000
   917             , AND REASON CODE 00000010.

Environment

Release : 21.0.5

Component: Agent MVS

OS:  z/OS V2R5

Cause

Defect, it's assumed that newer compiler optimizations and memory management changes lead to this crash as this code has not changed over the last six years.

Resolution

Workaround:

Set to HEAP(4M,4M,ANY,KEEP) instead of HEAP(4M,4M,ANY,FREE) in the JCL that starts the Agent MVS and then restart the Agent MVS.

Example of fix:

000001 //UC4RUN   PROC
000002 //*
000003 //UC4RUN   EXEC  PGM=UCXJM25,
000004 // REGION=0M,TIME=1440,
000005 // PARM=('/SYS6.UC4.LMX.INI')
000006 //STEPLIB  DD    DISP=SHR,DSN=SYS1.UC4.LOADLIB
000007 //SSTORE   DD    DISP=SHR,DSN=SYS6.UC4.LMX.SSTORE
000008 //CEEOPTS  DD   *
000009 HEAP(4M,4M,ANY,KEEP)
000010 RPTOPTS(ON)
000011 RPTSTG(ON)
000012 STACK(128K,128K,ANY)
000013 TRAP(OFF)
000014 /*
000015 //SYSPRINT DD    SYSOUT=*
000016 //STDOUT   DD    SYSOUT=*
000017 //SYSCPRT  DD    SYSOUT=*
000018 //JOBOUT   DD    SYSOUT=(A,INTRDR)

Solution:

This problem is currently being worked on by Engineering and the planned fix delivery method will be communicated at a later time