A fix is available
APAR status
Closed as program error.
Error description
Queue manager abended CSQV086E QUEUE MANAGER ABNORMAL TERMINATION REASON=00E50702 Dump title: ABN=5C6-00D40025,U=SYSOPR,MMC-CSQMLTR0, M=CSQGFRCV,LOC=CSQMLPLM.CSQMLTR0 Reason code X'00D44007' CSQM_ABEND_MMC_ERROR There is a window in which a shared queue may be deleted, causing fields in the IVSA to be cleared (e.g. IVSA.pVSObject) and at the same time a list-transition event may execute which refers to the cleared IVSA, resulting in the 5C6-00D40025 abend.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * * All users of IBM MQ for z/OS Version 9 Release 0 * * Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: * * Various abends occur when a shared queue is deleted on a * * different queue manager in the queue sharing group, and the * * local queue manager is processing a list transition for the * * queue. * * * * Symptoms can include: * * - Abend 0C4 in CSQMLTR0 * * - Abend 5C6-00C5101A in CSQEBMON * * - Abend 5C6-00D40025 in CSQMLTR0 * * - Abend 5C6-00E50002 in CSQMREF1 * * The abends are followed by abnormal queue manager * * termination 6C6 with REASON=00E50702 * **************************************************************** * RECOMMENDATION: * * none * **************************************************************** Insufficient serialisation between list transition exit processing for a shared queue and shared queue deletion processing can allow CSQICDSQ to free the IVSA for a shared queue that has just been deleted on another queue manager in the queue sharing group, while a list transition is being processed for that shared queue. Depending on the type of list transition being processed, and how quickly the freed IVSA is reused by another queue, this can lead to several different abends occurring in list transition processing. The abnormal termination of the SRB processing the list transition is unexpected, and results in the queue manager terminating abnormally.
Problem conclusion
The serialisation between shared queue deletion and list transition processing is improved to prevent the IVSA being freed while still being used by list transition processing.
Temporary fix
Comments
APAR Information
APAR number
PI66133
Reported component name
MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
000
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-07-19
Closed date
2016-09-30
Last modified date
2017-05-19
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI41300
Modules/Macros
CSQELTRX CSQICDSQ CSQIEXP2 CSQMLTR0 CSQMLTRX
Fix information
Fixed component name
MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
R000 PSY UI41300
UP16/10/14 P F610
Fix is available
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Document Information
Modified date:
19 May 2017