APAR status
Closed as program error.
Error description
The IBM MQ amqzlaa0 process uses an increasing amount of system memory.
Local fix
This issue may occur when an application which connects to an IBM MQ agent (amqzlaa0) process ends unexpectedly. If it is possible to avoid this happening then the memory leak will not occur.
Problem summary
**************************************************************** USERS AFFECTED: This issue occurs when a locally connected application ends unexpectedly when calling MQGET with a large message buffer. The connected application might be a user application or an IBM MQ process, such as amqrmppa. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: If an application that is connected to an IBM MQ agent process (amqzlaa0) ended unexpectedly while calling MQGET, then there was a window where a memory buffer used to store the message was not correctly freed. This resulted in a memory leak in the amqzlaa0 process. The affected code is triggered only if very large message buffers were used - those exceeding approximately 8MB.
Problem conclusion
The code has been corrected to free the allocated memory if the connected application ends while the MQGET call is in progress. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v9.1 LTS 9.1.0.20 v9.2 LTS 9.2.0.20 v9.3 LTS 9.3.0.10 v9.x CD 9.3.4 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
IT42851
Reported component name
IBM MQ BASE MP
Reported component ID
5724H7271
Reported release
910
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2023-01-05
Closed date
2023-08-01
Last modified date
2023-08-01
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 MP
Fixed component ID
5724H7271
Applicable component levels
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"910","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
01 August 2023