A fix is available
APAR status
Closed as program error.
Error description
MQ Master ABN=0C4-00000010,C=W9700.800.MMC -CSQMCLS2,M=CSQGFRCV,LOC=CSQMLPLM.CSQMCLS2 The abend in CSQMCLS2 occurs when attempting to close a handle that is already closed during deallocation processing, resulting in abnormal queue manager termination.
Local fix
na
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM MQ for z/OS Version 8 * * Release 0 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: If an application is cancelled while * * processing a MQSO_CREATE + MQSO_MANAGED * * MQSUB, then an ABEND0C4 may occur in * * CSQMOPNI. Subsequent MQOPEN/MQCLOSE * * processing may result in ABEND0C4 being * * issued from CSQMCLS2 and CSQMOPMD which * * can result in QMGR termination. * **************************************************************** MQ allocates handles to keep track of MQOPEN/MQCLOSE processing. When issuing a MQSO_CREATE + MQSO_MANAGED MQSUB call, the SYSTEM.NDURABLE.MODEL.QUEUE or SYSTEM.DURABLE.MODEL.QUEUE are opened as part of the processing to create the temporary dynamic queue for the subscription. A timing window exists in the end of memory processing which can result in the handle for this queue being freed twice, which results in the S0C4 abend. Depending on how the handle is reused, subsequent abends may occur which can result in QMGR termination.
Problem conclusion
The end of memory logic has been changed to no longer free the queue handle twice in certain MQSUB timing windows.
Temporary fix
Comments
APAR Information
APAR number
PH25064
Reported component name
IBM MQ Z/OS V8
Reported component ID
5655W9700
Reported release
000
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2020-05-05
Closed date
2021-01-29
Last modified date
2021-04-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PH33087 UI73687
Modules/Macros
CSQMCLMT
Fix information
Fixed component name
IBM MQ Z/OS V8
Fixed component ID
5655W9700
Applicable component levels
R000 PSY UI73687
UP21/03/03 P F103 ¢
Fix is available
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Document Information
Modified date:
02 April 2021