APAR status
Closed as program error.
Error description
During shutdown the queue manager writes failure records in FDC files. A loss of queue manager function might be experienced, but not always. Details from the FDC files follow: Probe Id :- XC130003 Component :- xehExceptionHandler Program Name :- amqzmur0 Arith1 :- 11 (0xb) Comment1 :- SIGSEGV: address not mapped(1c) MQM Function Stack amqzmur0 zmuUtilityManager zmuShutdownPhase zmuHealthCheck xcsFFST /opt/mqm/lib64/libmqml.so 'zmuHealthCheck+0x674 [0xffff80ff5447aef4] [Signal 11 (SEGV)] /opt/mqm/lib64/libmqml.so 'zmuShutdownPhase+0x2cb [0xffff80ff5447793b] /opt/mqm/lib64/libmqml.so 'zmuUtilityManager+0x1d37 [0xffff80ff54473e67] /opt/mqm/bin/amqzmur0 'main+0x16b [0x40118b] /opt/mqm/bin/amqzmur0 '_start+0x6c [0x400ffc] Also Probe Id ZX103101 is seen.
Local fix
Problem summary
**************************************************************** USERS AFFECTED: This can happen while shutting the queue manager down, and is rare because it is due to a rare timing condition. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: While working through a list of data blocks, an MQ internal task freed one of these blocks, then accessed the memory that was just freed. If in that brief moment another task in the queue manager had been given that block, then it had written its own data there, and the MQ internal task just mentioned would access a null pointer.
Problem conclusion
The IBM MQ product has been corrected so that the memory just freed is no longer accessed in this invalid way. The FDC is therefore avoided. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v9.0 CD 9.0.3 v9.0 LTS 9.0.0.2 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
IT19148
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
2017-02-07
Closed date
2017-03-21
Last modified date
2017-03-21
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 M/P
Fixed component ID
5724H7261
Applicable component levels
R900 PSY
UP
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Document Information
Modified date:
21 March 2017