APAR status
Closed as program error.
Error description
MQ 9.0.5.0 application encounters a memory access exception (e.g SIGSEGV) and a First Data Capture (FDC) record with the following data: Thread :- nn ChannelReceive Major Errorcode :- STOP Arith1 :- 11 (0xb) Comment1 :- SIGSEGV: address not mapped(0x34) With the following MQ function stack: MQM Function Stack ccxReceiveThreadFn cciProcessOne cciReceiveOne xcsFFST
Local fix
Problem summary
**************************************************************** USERS AFFECTED: A very small timing window exists that can affect MQ Client applications. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: A small timing window in the MQ client code could allow a buffer to be incorrectly freed, causing a SIGSEGV in the ChannelReceive thread.
Problem conclusion
Additional checks and diagnostics have been implemented to ensure the buffer is not freed whilst in use. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v9.1 CD 9.1.2 v9.1 LTS 9.1.0.3 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
IT26389
Reported component name
IBM MQ BASE M/P
Reported component ID
5724H7261
Reported release
905
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-09-22
Closed date
2019-02-28
Last modified date
2019-06-07
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
R905 PSY
UP
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.0","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
20 November 2021