IT36749: In MQ 9.2 .Net client throws System.ArgumentException Exception when using MQGET with waitInterval

APAR status

• Closed as program error.

Error description

• When MQGET with waitInterval is called, if the message is large
  enough that the waitInterval passes before the whole message is
  sent to the .Net client then the application has two different
  issues:
  
  
  1. If the queue has more than one message then following
  exception is received by the application :
  
  System.ArgumentException: Offset and length were out of bounds
  for the array or count is greater than the number of elements
  from index to the end of the source collection.
  at System.Buffer.BlockCopy(Array src, Int32 srcOffset, Array
  dst, Int32 dstOffset, Int32 count)
  at IBM.WMQ.Nmqi.MQProxyQueue.AddMessage(MQTSH
  tsh,MQASYNC_MESSAGE async)
  at IBM.WMQ.Nmqi.MQProxyQueueManager.AddMessage(MQTSH tsh)
  at IBM.WMQ.Nmqi.MQEncryptedSocket.Myread(Byte[] buffer, Int32
  offset, Int32 length, Int32 count, MQFAPConnection
  remoteConnection)
  at IBM.WMQ.Nmqi.MQEncryptedSocket.Read(Byte[] buffer, Int32
  offset, Int32 length, MQFAPConnection remoteConnection)
  
  
  2. If the queue has only message then, the application hangs
  forever.
  

Local fix

• When performing the MQGET use a higher wait interval so that
  delivery of the messages can complete before the next interval.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Users using managed .Net client application to get message with
  waitInterval set.
  
  
  Platforms affected:
  Linux on x86-64, Windows
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  A coding error in MQ .NET code meant an incorrect byte value
  being sent to server while requesting a message after the wait
  interval is elapsed. This caused the server to skip a
  notification flag causing this issue.
  

Problem conclusion

• MQ  .NET code has been corrected which now sends correct byte
  value on a request message to server which can deal with lesser
  wait interval for large messages.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.2 LTS   9.2.0.7
  v9.3 LTS   9.3.0.2
  v9.x CD    9.3.2
  
  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

  MQ BASE V9.2

• Fixed component ID

  5724H7281

Applicable component levels