IT21151: Intermittent queue manager connection failures from MQ processesand services

APAR status

• Closed as program error.

Error description

• MQ  processes or services(e.g. AMQP) intermittently fail to
  connect to the QM causing unexpected failures(e.g. termination
  of process and/or service), one or more failure data capture
  files are generated prior to failures, with identifying
  characteristics as follows:
  
  * FDCs with Probe Ids XC501006 and XC015003
  * MQ services(e.g. AMQP) if running and affected might terminate
  unexpectedly
  
  Probeid: XC501006
  Component name: xlsThreadPreInitialization
  Error: xecS_E_INVALID_HQCB.
  
  FDC Summary:
  
   2019/12/26 11:02:24.377489 amqrmppa 9780 10 XC015003
  xcsFreeQuickCell           xecL_E_INVALID_HANDLE
   2019/12/26 11:02:24.383503 amqrmppa 9780 10 XC501006
  xlsThreadPreInitialization xecS_E_INVALID_HQCB
   2019/12/26 11:02:24.390367 amqrmppa 9780 10 XC015003
  xcsFreeQuickCell           xecL_E_INVALID_HANDLE
   2019/12/26 11:02:24.397458 amqrmppa 9780 10 XC501006
  xlsThreadPreInitialization xecS_E_INVALID_HQCB
   2019/12/26 11:02:24.403949 amqrmppa 9780 10 XC501006
  xlsThreadPreInitialization xecS_E_INVALID_HQCB
   2019/12/26 11:02:38.789683 amqrmppa 9780 11 XC501006
  xlsThreadPreInitialization xecS_E_INVALID_HQCB
  
   QM Error message:
  
   12/26/2019 11:08:42 AM - Process(9780.10) User(mqm)
  Program(amqrmppa)
                      Host(host1) Installation(Installation1)
                      VRMF(8.0.0.4) QMgr(QM1)
  
  AMQ9508: Program cannot connect to the queue manager.
  
  EXPLANATION:
  The connection attempt to queue manager 'QM1 failed with reason
  code
  2195.
  ACTION:
  Ensure that the queue manager is available and operational.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users using AMQP service.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  The workload pattern of the AMQP listener within the MQ queue
  manager could cause an internal variable to overflow over time.
  Such an overflow caused unexpected failures and resulted in the
  abnormal termination of the AMQP service.
  

Problem conclusion

• The MQ queue manager has been updated, such that the logic
  handling this variable prevents the overflow.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.8
  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 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