A fix is available
APAR status
Closed as program error.
Error description
The 0C4 in CSQSSTEV appears to occur if storage contraction occurs after the readahead task has ended as part of queue manager shutdown. This is a consequence of the storage shortage. In the case the local storage exhausted by subpool 229, key 3 and then 0c4-4 abend occurred at CSQSSTEV during the queue manager termination. The queue manager terminated with abend ABN=0C4-00000004, U=SYSOPR ,C=MQ900.910.SMC-CSQSSTEV,M=CSQGFRCV,LOC=CSQSLD1 .CSQSSTEV after shortage of local storage. The abend dump shows PSW Key7 cannot update Key 3 storage pointed to by register 8. In the case the local storage exhausted by subpool 229,key 3 and then 0c4-4 abend occurred at CSQSSTEV during the qmgr termination. The qmgr terminated with abend ABN=0C4-00000004,U=SYSOPR ,C=MQ900.910.SMC-CSQSSTEV,M=CSQGFRCV,LOC=CSQSLD1 .CSQSSTEV after shortage of local storage. The abend dump shows PSW Key7 cannot update Key 3 storage pointed to by register 8.
Local fix
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: An abend 0C4 occurred during QMGR * * termination, in CSQSSTEV, when * * the QMGR was low on storage and the * * storage contraction process accessed * * a QuickCell Pool whose stack storage * * had already been freed. * **************************************************************** The QuickCell Pool was deallocated before the other QPHBs on the chain, so the Storage Contraction process attempted to access data in the QuickCell Pool Header (QPHB), which had already been freed.
Problem conclusion
CSQIRAHP and CSQISTRT have been updated to prevent this issue from occurring.
Temporary fix
Comments
APAR Information
APAR number
PH33362
Reported component name
IBM MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
000
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2021-01-13
Closed date
2021-08-19
Last modified date
2021-10-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI75635 UI75636 UI76830
Modules/Macros
CSQIRAHP CSQISTRT
Fix information
Fixed component name
IBM MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
R000 PSY UI76830
UP21/09/29 P F109
Fix is available
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Document Information
Modified date:
02 October 2021