A fix is available
APAR status
Closed as program error.
Error description
The QMGR ABENDs with 5C6-00C510AB after a dynamic allocation hang problem outside of MQ. A GRS display showed one TCB waiting for the SYSZTIOT ENQ, which was held by another TCB that was in dynamic allocation for archive log data set.
Local fix
n/a
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 * * Release 1 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Connections to CF structures using SMDS * * hang if log archiving is in progress * * and the archive tape system is * * unavailable. * * Applications attempting to open shared * * queues on affected structures will hang * * during MQOPEN processing. * * If XCF requires a response from the * * queue manager while the structure task * * is hung, it may terminate the task * * S026, resulting in abnormal queue * * manager termination with reason code * * 00C510AB * **************************************************************** * RECOMMENDATION: * **************************************************************** During structure connection processing, the structure task will attempt to connect to the SMDS for the structure, and requires the SYSZTIOT ENQ in order to do so. During log offload processing it is possible for the allocation of the archive log dataset to suspend while holding the SYSZTIOT ENQ due to the necessary tape subsystems being unavailable. In this situation the structure task will suspend until the log archive processing releases the ENQ, and consequently delaying applications attempting to use shared queues on the structure. If the structure task is required to respond to an XCF event, it will be unable to do so until the ENQ is released and processing resumed, which can lead to XCF detecting a connector hang and abending the task S026-08118001 or S026-08118002 and can lead to abnormal queue manager termination.
Problem conclusion
When connecting to the SMDS for a structure, CSQEDSI3 will attempt dynamic allocation of the SMDS conditionally on the SYSZTIOT ENQ being available. If the ENQ is unavailable after several retries have been made CSQE222E will be issued to report the failure, and the SMDSCONN will be changed to STATUS(ALLOCFAIL) AVAIL(ERROR). Applications attempting to put or get large messages on the SMDS will fail with MQRC_DATA_SET_NOT_AVAILABLE (MQRC 2561) until the ENQ is released and the SMDS connection is successfully made. Additional Keywords: MQSMDS/K Topic zm_E222E in the knowledge centre is updated: WebSphere MQ Reference Messages Coupling Facility manager messages (CSQE...) CSQE222E: Dynamic allocation of SMDS(qmgr-name)... The 'System programmer response' section has the following additional information added: "When the reason code is '02540000', indicating that the allocation failed due to a required ENQ being unavailable, the queue manager will automatically retry the allocation request on subsequent attempts to access the SMDS." 100Y CSQEDSB2 CSQEDSC1 CSQEDSC3 CSQEDSI1 CSQEDSI3 CSQEMPUT CSQIMGES
Temporary fix
********* * HIPER * *********
Comments
APAR Information
APAR number
PI26972
Reported component name
WMQ Z/OS V7
Reported component ID
5655R3600
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2014-10-06
Closed date
2015-02-12
Last modified date
2015-04-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PI32780 UI25106
Modules/Macros
CSQEDSB2 CSQEDSC1 CSQEDSC3 CSQEDSI1 CSQEDSI3 CSQEMPUT CSQIMGES
Fix information
Fixed component name
WMQ Z/OS V7
Fixed component ID
5655R3600
Applicable component levels
R100 PSY UI25106
UP15/03/04 P F503 ¢
Fix is available
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Document Information
Modified date:
02 April 2015