A fix is available
APAR status
Closed as program error.
Error description
When shutting down MQ it does not stop normally and has to be cancelled instead. STOP FORCE does not quiesce MQ. If DIS THREAD is issued no output is returned. . Additional Keywords: JR06A CSQJR06A
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM MQ for z/OS Version 9 * * Release 1 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Queue manager shutdown hangs waiting * * for a log prefetch task to complete. * **************************************************************** During log offload, log prefetch tasks are scheduled to prefetch the necessary log data. When the offload is complete, these tasks should end, however a serialisation problem can result in the prefetch task remaining suspended, despite the ROB being cancelled. During queue manager shutdown, another attempt is made to cancel the ROB, and CSQJT001 suspends waiting for the task to complete. However, the error left the ROB marked as already cancelled, and so the subsequent cancel has no effect, resulting in a hang in CSQJT001, and consequently queue manager shutdown.
Problem conclusion
CSQVSRX is changed to improve the serialisation between CSQVSUSP and CSQVCNCL.
Temporary fix
Comments
APAR Information
APAR number
PH23463
Reported component name
IBM MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2020-03-18
Closed date
2020-04-16
Last modified date
2020-09-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI69046
Modules/Macros
CSQVSRX
Fix information
Fixed component name
IBM MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
R100 PSY UI70052
UP20/08/11 P F008
Fix is available
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Document Information
Modified date:
03 September 2020