A fix is available
APAR status
Closed as program error.
Error description
After deleting a shared channel receiver, the CHINIT no longer responds and CPU usage may be high. This problem may occur when there is a duplicate key in MQ table of DB2 data-sharing group.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * * All users of IBM MQ for z/OS Version 9 Release 0 * * Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: * * Increased CPU may be seen in the Channel initiator when * * deleting a shared channel. * **************************************************************** * RECOMMENDATION: * * When deleting a shared channel, the status is read from the * * shared sync queue using a unique key for the channel stored * * in DB2 table CSQ.ADMIN_B_SSKT. However, if multiple shared * * channels have the same sync queue key due to some prior * * error, the delete processing may enter a loop, with high cpu * * seen in the CHINIT address space, and the channel will not * * be deleted. The CHINIT may become unresponsive, and require * * it to be cancelled. * ****************************************************************
Problem conclusion
Delete processing has been altered to not enter a loop in this case, and allow the CHINIT to remain responsive.
Temporary fix
Comments
APAR Information
APAR number
PI72557
Reported component name
MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
000
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-11-18
Closed date
2016-12-07
Last modified date
2017-02-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI43147
Modules/Macros
CSQXRCMN
Fix information
Fixed component name
MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
R000 PSY UI43147
UP17/01/10 P F701
Fix is available
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Document Information
Modified date:
01 February 2017