A fix is available
APAR status
Closed as program error.
Error description
If a new structure is connected to while a connect request is deferred, then the new connection can take the deferred connection's slot in the CTA. In this case, the QMGR successfully connected to structure B while the reconnection request to structure A was deferred. When the deferred reconnection request awoke and tried to reconnect, it abended S5C6-00C5101D in CSQEROUT due to failing a consistency check.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM MQ for z/OS Version 9 * * Release 3 Modification 0 and Release 4 * * Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Abend 5C6-00C5101D occurs in * * CSQELPLM.CSQEROUT, followed by abnormal * * queue manager termination with * * REASON=00C510AB. * **************************************************************** Following an unsuccessful attempt to connect to an application structure, the queue manager automatically attempts to reconnect to the structure in response to an ENF35 notification, but can defer the reconnection attempt. While a connection attempt is deferred, the structure can be deleted, and another structure created, reusing the old structure's position in the ECTA. When the deferred connection was subsequently attempted, the 5C6-00C5101D abend occurred due to the the reuse of the ECTA entry having cleared expected values.
Problem conclusion
When an application structure is deleted, any deferred connection requests are canceled prior to the ECTA entry being made eligible for reuse.
Temporary fix
Comments
APAR Information
APAR number
PH63649
Reported component name
IBM MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
300
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2024-10-09
Closed date
2025-07-04
Last modified date
2025-08-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UO03966 UO03967
Modules/Macros
CSQE197N CSQELTRS CSQEOCRQ CSQEROUT CSQEWRKT CSQMUCFS
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 August 2025