A fix is available
APAR status
Closed as program error.
Error description
Memory leak is observed in Subpool 2 Key 8 for LE HEAP storage when an application (using native bindings) executes API calls to MQ through the CSQBRRSI stub. In this case the application is active for long periods. Change Team finds that, when linked with CSQBRSSI, an application issuing MQDISC causes CSQBDSC to be invoked which is expected to delete any message handles associated with the hConn however this deletion is not taking place (Note that linking an application with CSQBRSTB has the same unexpected effect). . Additional keywords: SP2 KEY8
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 * * Release 0 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: MQRC 2127 MQRC_ADAPTER_STORAGE_SHORTAGE * * returned by MQCRTMH when using RRS * * stubs due to message handle storage * * remaining allocated. * * Other symptoms include storage shortage * * in the application address space. * **************************************************************** * RECOMMENDATION: * **************************************************************** When an application linked with an RRS stub calls MQCRTMH to create message handles associated with a hconn, and subsequently calls MQDISC without calling MQDLTMH to explicitly delete the message handles, the message handles are not implicitly deleted. The message handles (and any associated message properties control blocks) remain allocated using storage in the application address space until the task that issued MQCONN terminates. In applications that use long running tasks that repeatedly connect and disconnect from the queue manager, this can lead to an accumulation of storage for these message handles. This can lead to a short of storage condition occurring for the application address space, preventing further message handles being created, and causing unpredictable results for the application.
Problem conclusion
CSQBDSC is changed to correctly delete message handles associated with the connection being disconnected when called from an application linked with an RRS stub. 000Y CSQBDSC
Temporary fix
********* * HIPER * *********
Comments
APAR Information
APAR number
PI56626
Reported component name
WMQ Z/OS 8
Reported component ID
5655W9700
Reported release
000
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-02-04
Closed date
2016-02-25
Last modified date
2016-05-04
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI35651
Modules/Macros
CSQBDSC
Fix information
Fixed component name
WMQ Z/OS 8
Fixed component ID
5655W9700
Applicable component levels
R000 PSY UI35651
UP16/04/12 P F604 ¢
Fix is available
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Document Information
Modified date:
04 May 2016