A fix is available
APAR status
Closed as program error.
Error description
The client complained that CSQ1MSTR took the following dump during restart due to a JCL error with CSQ1AMSM however the qmgr does not terminate as expected : CSQV086E CSQ1 QUEUE MANAGER ABNORMAL TERMINATION REASON=00E80100 IEA794I SVC DUMP HAS CAPTURED: DUMPID=019 REQUESTED BY JOB (CSQ1MSTR) DUMP TITLE=CSQ1,ABN=602-00000000,U=SYSOPR ,C=MQ900.910.SSSC-CSQ1AMI2,M=CSQGFRCV,PSW=470C100081789BE4,ASID= 01A3 The 602 abend occurs due to a race condition between noticing that the AMS address space did not start successfully, and posting it that MQ startup has reached a given point. MQ should not be abending in this situation, and should instead rely on the existing logic for checking the existence of the AMSM address space. . Additional Keywords: ABEND602 ABENDS602
Local fix
N/A
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM MQ for z/OS Version 9 * * Release 1 Modification 0 and Release 2 * * Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: If AMS fails to start, it is possible * * that the QMGR will abend with an * * incorrect code (S602). * **************************************************************** If AMS fails to start or terminates unexpectedly, the QMGR should abend with S6C6. A race condition can occur, where an ECB is posted to the AMS address space without checking the existence of the AMS address space.
Problem conclusion
The QMGR startup routine was changed to always check the AMS address space exists before posting an ECB to it.
Temporary fix
Comments
APAR Information
APAR number
PH39957
Reported component name
IBM MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2021-08-18
Closed date
2021-12-10
Last modified date
2022-03-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI78486 UI78487
Modules/Macros
CSQ3AMI2
Fix information
Fixed component name
IBM MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
Fix is available
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Document Information
Modified date:
02 March 2022