IC65023: Thread handle leak in amqrmppa processes observed leading to increased usage of non-paged pool on Windows.

WebSphere MQ V7.0 Fix Pack 7.0.1.2
WebSphere MQ V7.0.1 for i5/OS Fix Pack 7.0.1.2

APAR status

• Closed as program error.

Error description

• The following errors were observed on the system:
  1.) System Event log: Server was unable to allocate from the
  system non-paged pool because the pool was empty.
  2.) Queue Manager error log: The return code from the TCP/IP
  (send) call was 10055 X('2747').
  3.) FDC: ERROR_NO_SYSTEM_RESOURCES during a WriteFile operation.
  
  These errors all relate to exhausting the non-paged pool
  resources which are used primarily by the kernel for sockets,
  handles and other system objects. An observation of the
  amqrmppa process using perfmon showed an ever increasing usage
  of non-paged pool as well as handle objects (which consume non-
  paged pool). Use of the handle utility revealed these handle
  objects to be primarily of the 'Thread' type.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  Any users using client applications connecting to a WebSphere
  MQ V7 queue manager. Server applications using asynchronous
  consume API calls are also affected.
  
  Platforms affected:
  Windows
  
  ****************************************************************
  PROBLEM SUMMARY:
  As part of changes made in WebSphere MQ V7, the server
  implicitly uses asynchronous consume mechanisms to deal with
  incoming client requests for messages. This results in the
  creation of a new thread which performs the asynchronous consume
  operations. However, the handle to this thread was not being
  closed after the thread had been destroyed.
  

Problem conclusion

• WebSphere MQ was modified to ensure that the handle to the
  asynchronous consume thread was closed once that connection was
  no longer valid.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
                     v7.0
  Platform           Fix Pack 7.0.1.2
  --------           --------------------
  Windows            U200316
  
  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 WINDOWS V7

• Fixed component ID

  5724H7220

Applicable component levels

• R701 PSY

     UP