IT27232: When using a connection name list there is a memory leak in the channel code

APAR status

• Closed as program error.

Error description

• When providing a channel definition to a native MQ client (C,
  C++, RPG, COBOL, Unmanaged .NET) via API, MQSERVER environment
  variable or pre-connect exit and the channel has a connection
  name with comma separated values, each connection attempt leaks
  heap storage. The storage is not freed until the process
  terminates.
  
  The problem does not affect applications using a client
  connection definition table (CCDT), Java or fully managed .NET
  clients or channel definitions that do not use comma separated
  values.
  

Local fix

• Use only one entry in the connection name field.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  User with native clients (C, C++, unmanaged .NET, RPG, COBOL)
  with channel definitions that use comma separated connection
  names and source this information via API (MQCONNX, connect,
  etc), MQSERVER environment variable or a pre-connect exit are
  potentially affected.
  
  Users using CCDT files to provide channel configuration are not
  affected.
  
  The application would need to attempt to a queue manager
  multiple times, this includes application logic (loops), client
  auto-reconnect or multiple threads.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  Internal data structures used to represent channels for comma
  separated hosts are added to a list of resources to free when
  using a single channel definition source such as API, MQSERVER
  or pre-connect exit. A logic omission meant that the code to
  free the structures once they were no longer in use was never
  executed.
  

Problem conclusion

• Resource cleanup checks are now performed when clients attempt
  to connect to a queue manager, regardless of the source of the
  connection data.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.12
  v9.0 LTS   9.0.0.6
  v9.1 CD    9.1.2
  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 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