APAR status
Closed as program error.
Error description
An IBM MQ v8.0.0.5 queue manager with activity tracing enabled, channel processes abnormally terminated with SIGSEGV: address not mapped Error log shows AMQ7159: A FASTPATH application has ended unexpectedly. FDC generated with: Probe Id :- XC130003 Program Name :- amqrmppa Thread :- 211 AsyncConsume Probe Type :- HALT6109 Major Errorcode :- STOP Comment1 :- SIGSEGV: address not mapped(0x8) MQM Function Stack zlaMainThread zlaProcessMessage zlaProcessMQIRequest zlaMQCB zsqMQCB zsqATCBAfter xcsFFST
Local fix
Turn off activity tracing.
Problem summary
**************************************************************** USERS AFFECTED: Users of activity tracing tracing and with fastpath channels enabled are at risk of being affected by this issue. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: When an IBM MQ queue manager is configured to use fastpath channels (MQIBindType=FASTPATH in qm.ini) and activity trace is enabled, then changing a queue so that it becomes get inhibited can cause a SIGSEGV to occur and the channel process will end. The SIGSEGV is caused by IBM MQ referencing a piece of data which is not valid when the channel process is connected using fastpath MQI bindings.
Problem conclusion
The code was modified to include a check that the data was valid before attempting to access it. It should be noted that when running with FASTPATH bindings then certain MQCBD fields may be missing from MQCB activity trace, as unused fields within the MQCBD will not be initialized in FASTPATH mode, and omitted from the output accordingly. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v7.5 7.5.0.8 v8.0 8.0.0.6 v9.0 CD 9.0.1 v9.0 LTS 9.0.0.1 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
IT16342
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
2016-07-28
Closed date
2016-08-25
Last modified date
2017-06-01
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
WMQ BASE MULTIP
Fixed component ID
5724H7251
Applicable component levels
R800 PSY
UP
[{"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":"8.0.0.0"}]
Document Information
Modified date:
10 September 2020