APAR status
Closed as program error.
Error description
Queue manager hangs and becomes unresponsive. The following failure data capture (FDC) records can be observed: amqzlaa0 33584.6898 KN369026 ksiDynBuf_new xecS_E_NO_MEM amqzlaa0 5232.5 XY388001 xcsConnectSharedMemSet xecS_E_MEM_SET_NOT_FOUND amqzlaa0 5232.4 KN028004 kpiInitialise xecF_E_UNEXPECTED_RC
Local fix
Restart the queue manager
Problem summary
**************************************************************** USERS AFFECTED: Users of selectors may be more likely to hit this problem. The issue has only been seen in IBM MQ version 8 and so this version of IBM MQ may be more vulnerable to the problem. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: A bad return code is received when trying to extend a selector shared memory block. This results in a shared memory set being incorrectly removed, leading to queue manager instability.
Problem conclusion
The problem has not been seen on IBM MQ after release version 8. Definitive root cause for the problem was not found but there is a suspicion that the default size of the shared memory set for selectors was too small. A fix has been added which applies to IBM MQ version 8 and version 9 and increases the default selector set size. This fix is not needed in version 9.1 or higher as the selector set size was already larger in those releases. Extra diagnostics have also been added to the code for all releases in order to assist IBM Support should the problem occur again. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v9.0 LTS 9.0.0.12 v9.1 LTS 9.1.0.10 v9.2 LTS 9.2.0.4 v9.x CD 9.2.4 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
IT35443
Reported component name
IBM MQ BASE M/P
Reported component ID
5724H7261
Reported release
900
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2021-01-07
Closed date
2021-08-26
Last modified date
2021-08-26
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PH40142
Fix information
Fixed component name
IBM MQ BASE M/P
Fixed component ID
5724H7261
Applicable component levels
[{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.0"}]
Document Information
Modified date:
27 August 2021