APAR status
Closed as program error.
Error description
A Failure Data Capture (FDC) file may be generated generated similar to the one below when an MQ channel agent receives an MQSUB API call. The issue has been observed with a queue manager running on the MQ Appliance, but could also affect queue managers on distributed operating systems. +--------------------------------------------------------------- --------------+ | | | WebSphere MQ First Failure Symptom Report | | ========================================= | | | | Component :- aouLockObjectCatalogue | | SCCS Info :- /build/slot1/p800_P/src/lib/lqm/amqaoula.c, | | Line Number :- 147 | | Program Name :- amqrmppa | | Arguments :- -m QMA | | Addressing mode :- 64-bit | | LANG :- | | Process :- 140221 | | Process(Thread) :- 140422 | | Thread :- 171 RemoteResponder | | QueueManager :- QMA | | UserApp :- FALSE | | ConnId(1) IPCC :- 399 | | ConnId(2) QM :- 19255 | | ConnId(3) QM-P :- 343 | | Last HQC :- 2.5.5-23020160 | | Last HSHMEMB :- 2.13.24-837184 | | Last ObjectName :- | | Major Errorcode :- krcE_UNEXPECTED_ERROR | | Minor Errorcode :- OK | | Probe Type :- INCORROUT | | Probe Severity :- 2 | | Probe Description :- AMQ6125: An internal IBM MQ Appliance error has | | occurred. | FDCSequenceNumber :- 0 | | | +--------------------------------------------------------------- --------------+ MQM Function Stack ccxResponder rrxResponder ccxReceiveThreadFn cciProcessOne cciProcessUserData cciProcessAsyncRcv rriServerAsyncRcv rriMQIServerReceive rriMQIServerCall rriProcessSubscribe zstMQSUB zifMQSUB zsqMQSUB kpiMQSUB kqiSubscribeTopic kqiCreateSubscription kqiSetupDestQForNewSub kqiOpenIt kqiOpenQueue kqiOpenModel apiRaiseMinorQueue aocCreateMinorQueue aouLockSynChain xcsFFST
Local fix
Problem summary
**************************************************************** USERS AFFECTED: Users who make multiple concurrent attempts to create new MQ objects of the same name. This is most likely to be the creation of a fixed name dynamic queue, where the dynamic queue is created upon first reference, for example the detection that a fixed name temporary dynamic queue has already been created through the returning of an MQRC_OBJECT_ALREADY_EXISTS on the corresponding MQOPEN. Platforms affected: AIX, HP-UX Itanium, HP-UX PA-RISC, IBM iSeries, Linux on S390, Linux on x86, Linux on x86-64, Linux on zSeries, Solaris SPARC, Solaris x86-64, Windows **************************************************************** PROBLEM DESCRIPTION: Creating a new MQ object involves a number of complex lock interactions. MQ's locks are arranged in a strict hierarchy, to avoid the possibility of deadlock, and the code that detects that the same named object has unexpectedly been created in a window between checking for the objects existence, and creating the object contained a programming error which resulted in a lock not being released when it should have been.
Problem conclusion
The MQ queue manager code has been corrected to avoid the possibility of this lock unexpectedly not being released. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v8.0 8.0.0.5 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
IT15087
Reported component name
WMQ BASE MULTIP
Reported component ID
5724H7251
Reported release
800
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-05-04
Closed date
2016-08-01
Last modified date
2017-03-10
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 BASE MULTIP
Fixed component ID
5724H7251
Applicable component levels
R800 PSY
UP
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Document Information
Modified date:
10 March 2017