A fix is available
APAR status
Closed as program error.
Error description
A problem causes the GroupUR agent on a queue manager to loop if indoubt units of work exist on a stopped peer queue manager. This can prevent the peer queue manager from starting, cause high CPU usage and prevent any other GroupUR requests from running.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM MQ for z/OS * * Version 9 Release 1 Modification 0, * * Release 2 Modification 0 * * and Release 3 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: The xa_recover operation may cause the * * GroupUR agent of a queue manager to * * hang and prevent other QSG members from * * starting if indoubt units of work exist * * on a stopped peer in the same queue * * sharing group. * **************************************************************** A control variable is not updated in one path of a loop, when processing the log records for an indoubt unit of work on an inactive peer. This occurs if the unit of work state has been logged multiple times since the last checkpoint. This causes high CPU usage and the ENQ on the inactive queue manager's BSDS (CSQJBSDS) to be held by open, preventing it from starting.
Problem conclusion
CSQMCIG2 has been updated to correctly handle recovery of indoubt units of work that have been logged multiple times.
Temporary fix
Comments
APAR Information
APAR number
PH55180
Reported component name
IBM MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2023-06-14
Closed date
2023-08-07
Last modified date
2023-09-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI93084 UI93085 UI93086
Modules/Macros
CSQMCIG2
Fix information
Fixed component name
IBM MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
R100 PSY UI93086
UP23/08/19 P F308 ¢
R200 PSY UI93085
UP23/08/19 P F308 ¢
R300 PSY UI93084
UP23/08/19 P F308 ¢
Fix is available
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Document Information
Modified date:
01 September 2023