IT25488: Intermittent NullReferenceException from SPINotify

APAR status

• Closed as program error.

Error description

• MQ .NET client application is failing with
  NullReferenceException from SPINotify if Client Auto
  Reconnection and SSL are enabled
  
  Unhandled Exception: System.NullReferenceException: Object
  reference not set to an instance of an object.
     at IBM.WMQ.MQFAP.SPINotify(Hconn hConn, Int32&
  options,LpiNotifyDetails notifyDetails, Int32& compCode, Int32&
  reason)
     at IBM.WMQ.MQFAP.spiNotify(Hconn getterHconn, Int32&
  options,LpiNotifyDetails notifyDetails, Int32&
  pCompCode,Int32&pReason)
     at IBM.XMS.Client.WMQ.WmqConsumerShadow.Close()
     at IBM.XMS.Client.WMQ.WmqMessageConsumer.Close()
     at IBM.XMS.Client.Impl.XmsMessageConsumerImpl.Close()
     at MqDotnetTests_Connection.TestList.NET8XMSMSSL5()
     at MqDotnetTests_Connection.TestList.Main(String[] args)
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  User of MQ managed .NET application connecting using SSL Channel
  with Client Auto Reconnection
  
  
  Platforms affected:
  Windows
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A logic error in the MQ managed .NET client code meant that if a
  client thread called SPINotify while a reconnect attempt was in
  progress, a null reference was accessed, resulting in the
  NullReferenceException being reported.
  

Problem conclusion

• The MQ .NET client code has been modified to prevent this null
  reference being accessed.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.0 CD    9.0.4
  v9.0 LTS   9.0.0.5
  
  
  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

  IBM MQ BASE M/P

• Fixed component ID

  5724H7261

Applicable component levels