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CBAC task abends RLEL or AKCS followed by AEXZ then BRU jobstep fails with CBKSC8008E

Question & Answer


Question

Why is CBAC, the CICS mirror task, failing with an RLEL or AKCS abend followed by abend AEXZ during peak batch processing of my CICS Batch Application Control for z/OS (CICS BAC) V1.1.1 Batch Request Utility (BRU) jobstep?

After CBAC abends my batch job fails abnormally with messages:

 CBKSC8008E jobname  Unknown error received from region xxxxxxxx during
 EXCI request. Error codes: 0000000C 000001A6 00000000
 C1C5E7E9 00000000
 
 IEA995I SYMPTOM DUMP OUTPUT
   USER COMPLETION CODE=3111
  TIME=03.22.02  SEQ=38141  CPU=0000  ASID=013D
  PSW AT TIME OF ERROR  078D1000   8002FA06  ILC 2  INTC 0D
    ACTIVE LOAD MODULE           ADDRESS=00007EE8  OFFSET=00027B1E
    NAME=CBKBMAIN
    DATA AT PSW  0002FA00 - 00181610  0A0D9120  A08847E0
    GR 0: C0000000   1: C0000C27
       2: 2385B000   3: 00000001
       4: 23873000   5: 23866A00
       6: 23866400   7: 00000000
       8: 23800700   9: 00038B10
       A: 00041000   B: 000304A0
       C: 0002F4A0   D: 00043000
       E: 8002F966   F: 00030930
  END OF SYMPTOM DUMP
 IEF472I jobname $TEPnnn jobname - COMPLETION CODE - SYSTEM=000
 USER=3111 REASON=00000000   

Answer

This is due to OMEGAMON Resource Limit Elapsed Time abend RLEL of the CBAC CICS mirror task.

In this instance, a CICS system dump showed almost 13 seconds of Miscellaneous TCB dispatch time (MSDISPT) which would occur on the FO TCB. This can be related to MVS catalog LOCATE calls or other delays related to accessing the data set.

An AKCS abend can also occur if the task is not subject to the RLEL OMEGAMON monitoring for elapsed time.

If you cannot determine the source of the delay or contention using RMF III, you can consider adding or increasing the DTIMOUT value associated with the CICS BAC mirror transaction id so it can run longer before getting timed out.

Note: You could increase the RLEL time, however when I discussed with the developer, he recommended no limits on the mirror as this task is performing batch updates and should be allowed to finish.

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Product Synonym

CICSBAC CICS BAC

Document Information

Modified date:
12 January 2016

UID

dwa1243074