A fix is available
APAR status
Closed as program error.
Error description
During QMGR startup and after the CHINIT starts, the AMSM address space has an issue causing the address space to terminate which also results in the QMGR shutdown. During this time there is a potential timing issue where the CHIN dispatcher tasks are being attached and are connecting to the QMGR but result in a MQRC_Q_MGR_NOT_AVAILABLE since the QMGR is shutting down. During the CHINIT shutdown, it fails to post the xGwa.lPSCtrlECB to notify the Pub/Sub offload task that termination is required. This leaves the CHINIT jobstep TCB waiting forever for the Pub/Sub offload task to terminate.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM MQ for z/OS Version 9 * * Release 2 Modification 0 and Release 3 * * Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: If dispatchers fail to start, the * * CHINIT may hang indefinitely, * * requiring an MVS CANCEL. * **************************************************************** Upon CHINIT startup, the pub/sub offload task waits on an ECB posted by supervisor initialisation, however if no dispatchers start (such as if the QMGR is terminating), this ECB is never posted and the CHINIT hangs indefinitely.
Problem conclusion
xGwa.lPSCtrlECB is now posted upon CHINIT termination.
Temporary fix
Comments
APAR Information
APAR number
PH42238
Reported component name
IBM MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
200
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
YesSpecatt / CST / Xsystem
Submitted date
2021-11-19
Closed date
2022-09-09
Last modified date
2022-10-07
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI78790 UI82344
Modules/Macros
CSQXADPC CSQXJST CSQXSPRI CSQXSPRT
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:
07 October 2022