APAR status
Closed as program error.
Error description
IBM MQ keeps details of queued messages in shared memory and in some cases this memory is not freed completely when it should be. For example, issuing "CLEAR QLOCAL" against a queue which was previously open but has since been closed.
Local fix
This problem only affects queues containing more than 8192 messages and so avoiding deep queues is one workaround.
Problem summary
**************************************************************** USERS AFFECTED: Users on Linux with deep queues are more likely to be affected by this problem. Platforms affected: Linux on Power, Linux on S390, Linux on x86, Linux on x86-64, Linux on zSeries **************************************************************** PROBLEM DESCRIPTION: Over a period of time the amount of shared memory that is being used by IBM MQ may be seen to be growing in an uncontrolled manner. This was caused by a gcc compiler upgrade which introduced an optimisation that affected the way that IBM MQ behaves when removing internal queue meta-data.
Problem conclusion
The affected IBM MQ code has been modified so that aggressive loop optimisation does not modify intended behaviour. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v9.0 LTS 9.0.0.7 v9.1 CD 9.1.2 v9.1 LTS 9.1.0.2 The latest available maintenance can be obtained from 'WebSphere MQ Recommended Fixes' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037 If the maintenance level is not yet available information on its planned availability can be found in 'WebSphere MQ Planned Maintenance Release Dates' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309 ---------------------------------------------------------------
Temporary fix
Comments
APAR Information
APAR number
IT27072
Reported component name
IBM MQ BASE M/P
Reported component ID
5724H7261
Reported release
900
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-11-22
Closed date
2019-02-28
Last modified date
2019-02-28
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
IBM MQ BASE M/P
Fixed component ID
5724H7261
Applicable component levels
[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.0","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
28 February 2019