APAR status
Closed as program error.
Error description
Initially a failure data capture (FDC) record is generated, with the following Probe Id, Component, and Function Stack: Probe Id :- CO000003 Component :- ccxAllocMem Major Errorcode :- rrcE_BAD_PARAMETER Probe Description :- AMQ6125: An internal IBM MQ error has occurred. MQM Function Stack cciReceiveThread ccxReceiveThreadFn cciProcessOne cciReceiveOne cciSendHeartbeat ccxAllocMem xcsFFST Moments later, an Access Violation FDC record is generated, with the following Probe Id, Component, and Function Stack: Probe Id :- XC130031 Component :- xehExceptionHandler Probe Description :- AMQ6109: An internal IBM MQ error has occurred. Comment1 :- Access Violation at address 0000000000000008 when reading. . MQM Function Stack cciReceiveThread ccxReceiveThreadFn cciProcessOne cciReceiveOne cciSendHeartbeat ccxFreeMem xcsRequestThreadMutexSem xcsFFST
Local fix
Disable heartbeating on the SVRCONN channel
Problem summary
**************************************************************** USERS AFFECTED: This issue affects users of clients which connect via server-connection (SVRCONN) channels and have heartbeating enabled. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: Due to a coding error, when freeing a memory buffer used for the sending of heartbeat flows, a small timing window existed where the client could attempt to access an invalid memory address. This resulted in an access violation on Microsoft Windows, or a SIGSEGV on UNIX platforms. It was possible for the timing window to occur at either the client or queue manager side of the channel.
Problem conclusion
The MQ client logic, and the queue manager channel logic, have been updated to prevent this invalid memory access. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v9.0 LTS 9.0.0.7 v9.1 CD 9.1.3 v9.1 LTS 9.1.0.2 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
IT26218
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
2018-09-07
Closed date
2019-03-18
Last modified date
2019-03-18
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
[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.0","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
18 March 2019