PM55965: +CSQX489E XXX1 CSQXRESP Maximum instance limit 300, exceeded, channel ABC.DDDEFFF.CLCLCLCL, connection 192.168.1.230

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• In WebSphere Application Server V7 servers, the servant region
  can consume all available MQ connections, leading to message
  CSQX489E to be issued on the MVS console - indicating no more
  MQ connections can be obtained:
  
  +CSQX489E LPW1 CSQXRESP Maximum instance limit 300, exceeded,
  channel ABC.DDDEFFF.CLCLCLCL, connection 192.168.1.230
  
  See V6.1 SYSROUTE APAR PM55680 for V6.1 failure symptoms caused
  by the bug. They are significantly different than for servers
  running V7.
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  AS
  no
  
  
  
  
  
  
  ad
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server V7.0                                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: During transaction recovery a WMQ       *
  *                      ExceptionDeliveryThread is leaked for   *
  *                      each WMQ resource that needs recovery   *
  *                      by the WebSphere Transaction Manager.   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  During transaction recovery of an WMQ resource a
  MQExceptionDelivery Thread is started and never cleaned up. If
  transaction recovery fails for any reason then recovery is
  reattempted for all resources regardless as to whether these
  resources sucessfully recovered or not. This will potentially
  lead to many MQExceptionDeliveryThreads being created and
  causing an OutOfMemoryError.
  This leak is present on all platforms but due to the way
  transaction recovery occurs on zOS then it is more likely to
  reach an OutOfMemoryError condition on this platform.
  

Problem conclusion

• This APAR fixes the problem by closing the MQ Connection once
  the MQ resource has finished recovery.
  
  APAR PM55965 is currently targeted for inclusion in Service
  Level (Fix Pack) 7.0.0.23 of WebSphere Application Server V7.0.
  
  Please refer to URL:
  //www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
  for Fix Pack availability.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PM55680

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WEBSPHERE FOR Z

• Fixed component ID

  5655I3500

Applicable component levels

• R700 PSY UK78616

     UP12/05/26 P F205

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.