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DFHDS0001 202 AKEB at offset FFFF in DFHDSDS3 when using TMON for CICS

Question & Answer


Question

What could cause an abend DS0001 202/AKEB in DFHDSDS3 during CICS shutdown? My CICS region is being quiesced with a normal shutdown request and begins the normal termination sequence. I receive the abend immediately following the message that CICS is starting the termination of its VTAM sessions:

DFHZC2305I applid Termination of VTAM sessions beginning
DFHDS0001 applid An abend (code 202/AKEB) has occurred at offset X'FFFF' in module DFHDSDS3

A dump is produced, then CICS resumes what appears to be normal termination and completes with a condition code 0. In all the dumps examined, the kernel stack entry appears to be active on an L8 TCB. The error occurs with some frequency but always at CICS termination and when the region restarts it is without a problem. The region is restarted COLD.

Answer

There is a known problem where ASG-TMON for CICS module TMON945 does a SVC 2 POST and passes an invalid ECB address. TMON has provided a TMON/CICS HIPER PTF TH03982 as corrective action.

If you have a system dump of the DS0001 abend202 abendAKEB, you can enter IPCS command IP SYSTRACE to display the system trace. Here is the systrace showing the SVC 2 POST:

 PR   ASID WU-Addr- Ident CD/D PSW----- Address-  Unique-1 Unique-3       
 0003 01E2 008B9E78  SVC     2 00000000_268A8946  2649D3A4 2649D3A0  Post 

Next, you can format the Loader domain, by entering IPCS command VERBX DFHPDxxx 'LD=1 (where xxx is your release level of CICS like 700 for CICS TS 5.3). The Loader domain shows the TMON load point and release:

 PGM NAME ENTRY PT  CSECT   LOAD PT. REL 
 TMON945  A68A6200 DFHYA650 268A6200 650  

The PSW 268A8946 from the SVC 2 minus the Load Point 268A6200 will give you the offset x'2746' into TMON945 where the SVC 2 POST was issued passing the invalid ECB address.

Contact ASG Technologies if you need additional assistance.

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Product Synonym

CICS/TS CICSTS CICS TS CICS Transaction Server

Document Information

Modified date:
18 July 2017

UID

dwa1386594