Fixes are available
APAR status
Closed as program error.
Error description
Increased IPC shared memory usage may occur. If that steadily increases under relatively constant workload, it may be indicative of a leak. No errors or FDCs are generated for this problem. Note also that there may be the possibility of MQRFH2 message properties being incorrectly attributed to messages which do not have MQRFH2 properties.
Local fix
Problem summary
**************************************************************** USERS AFFECTED: Users with a queue manager that processes messages containing message properties in MQRFH2 format may be affected by this problem. Shared memory leakage may occur if such messages are browsed and then left on a queue for long periods of time. Use of the WebSphere MQ message property functionality introduced in MQ V7 does not lead to this problem, since the message properties are not held as MQRFH2 headers. Platforms affected: All Distributed (iSeries, all Unix and Windows) **************************************************************** PROBLEM SUMMARY: Message property information is created in IPC shared memory when a message containing MQRFH2 properties is browsed. It would be freed if the message were to be destructively got. If however the queue is unloaded (something that WebSphere MQ may do for a variety of reasons, including to checkpoint a queue), the shared memory containing the message property information may be leaked. As a side effect of the failure to sometimes clean up (and free) message property information, there is also the possibility that it could be picked up by some other message which does not have MQRFH2 properties.
Problem conclusion
The allocation and freeing of the shared memory for MQRFH2 message properties was investigated. Changes to ensure the absence of memory leaks were implemented. These changes also ensure that MQRFH2 message property information is not left around for other, non-MQRFH2 messages to inadvertently pick up. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: v7.0 Platform Fix Pack 7.0.1.8 -------- -------------------- Windows U200335 AIX U845856 HP-UX (PA-RISC) U847965 HP-UX (Itanium) U847970 Solaris (SPARC) U847966 Solaris (x86-64) U847972 iSeries 7.0.1.8 Linux (x86) U847967 Linux (x86-64) U847971 Linux (zSeries) U847968 Linux (Power) U847969 v7.1 Platform Fix Pack 7.1.0.1 -------- -------------------- Windows 7.1.0.1 AIX 7.1.0.1 HP-UX (PA-RISC) 7.1.0.1 HP-UX (Itanium) 7.1.0.1 Solaris (SPARC) 7.1.0.1 Solaris (x86-64) 7.1.0.1 iSeries 7.1.0.1 Linux (x86) 7.1.0.1 Linux (x86-64) 7.1.0.1 Linux (zSeries) 7.1.0.1 Linux (Power) 7.1.0.1 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
IV11593
Reported component name
WMQ AIX V7
Reported component ID
5724H7221
Reported release
701
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-11-30
Closed date
2011-12-16
Last modified date
2012-01-19
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
WMQ AIX V7
Fixed component ID
5724H7221
Applicable component levels
R701 PSY
UP
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Document Information
Modified date:
31 March 2023