IC88666: WEBSPHERE MQ V7.1: CWWMQ0045E AND HUNG THREAD SEEN WHEN DEACTIVATING ACTIVATION SPECIFICATION ON Z/OS

WebSphere MQ V7.5 Fix Pack 7.5.0.1
Fix Pack 7.1.0.3 for WebSphere MQ V7.1

APAR status

• Closed as program error.

Error description

• The following thread is seen as hung in the Servant Region:
  at java/lang/Object.wait(Native
  4XESTACKTRACE        at java/lang/Object.wait(Object.java:
  4XESTACKTRACE        at
  com/ibm/mq/connector/inbound/ServerSessionImpl.
  close(ServerSessionImpl.java:
  4XESTACKTRACE        at
  com/ibm/mq/connector/inbound/ServerSessionPoolImpl.
  closeInternal(ServerSessionPoolImpl.java:
  4XESTACKTRACE        at
  com/ibm/mq/connector/inbound/ServerSessionPoolImpl.
  close(ServerSessionPoolImpl.java:
  4XESTACKTRACE        at
  com/ibm/mq/connector/inbound/MessageEndpointDeployment.
  stopDeliveryASF(MessageEndpointDeployment.java:
  4XESTACKTRACE        at
  com/ibm/mq/connector/inbound/MessageEndpointDeployment.
  stop(MessageEndpointDeployment.java:
  4XESTACKTRACE        at
  com/ibm/mq/connector/ResourceAdapterImpl.
  endpointDeactivation(ResourceAdapterImpl.java:
  4XESTACKTRACE        at
  com/ibm/ejs/j2c/ActivationSpecWrapperImpl.
  deactivateUnderRAClassLoaderContext(ActivationSpecWrapperImpl.
  java:
  4XESTACKTRACE        at
  com/ibm/ejs/j2c/ActivationSpecWrapperImpl.
  deactivateEndPoint(ActivationSpecWrapperImpl.java:
  4XESTACKTRACE        at com/ibm/ejs/j2c/RAWrapperImpl.
  deactivateEndpoint(RAWrapperImpl.java:
  4XESTACKTRACE        at com/ibm/ejs/j2c/RALifeCycleManagerImpl.
  deactivateEndPoint(RALifeCycleManagerImpl.java:
  4XESTACKTRACE        at
  com/ibm/ejs/container/MessageEndpointFactoryImpl.
  deactivateEndpoint(MessageEndpointFactoryImpl.java:
  4XESTACKTRACE        at com/ibm/ejs/container/EJSContainer.
  uninstallBean(EJSContainer.java:
  
  and the following exception is seen in the log:
  BBOO0220E: [:] CWWMQ0045E: An internal error has occurred. An
  error, with message JMSCC0033: A synchronous method call is
  not permitted when a session is being used asynchronously:
  'deliver'., caused endpoint <endpoint_name> to be stopped.
  
  The Servant Region then abends due to the hung thread.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  This issue affects users of the WebSphere MQ Resource Adapter
  V7.1 and V7.5 that are using Activation Specifications.
  
  Platforms affected:
  All Distributed (iSeries, all Unix and Windows) +Java +Java zOS
  ****************************************************************
  PROBLEM SUMMARY:
  A hung thread was detected that was attempting to deactivate an
  message endpoint when the application was either stopped or
  uninstalled. The thread was waiting for an active ServerSession
  that complete before allowing the endpoint to deactivate.
  
  A problem in the assignment of message references to a
  ServerSession in the pool caused the following exception to
  occur:
  "
  JMSCC0033: A synchronous method call is
  not permitted when a session is being used asynchronously:
  'deliver'., caused endpoint <endpoint_name> to be stopped.
  "
  
  The above exception then caused the ServerSession to remain in
  an active state even though the ServerSession would not run.
  

Problem conclusion

• This APAR solves the problem by ensuring that the ServerSession
  is not incorrectly assigned message references when it is
  returned to the ServerSession Pool. This will then allow any
  deactivate endpoint thread to complete as no ServerSession will
  be seen as active.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
                     v7.1
  Platform           Fix Pack 7.1.0.3
  --------           --------------------
  Windows            7.1.0.3
  AIX                7.1.0.3
  HP-UX (Itanium)    7.1.0.3
  Solaris (SPARC)    7.1.0.3
  Solaris (x86-64)   7.1.0.3
  iSeries            7.1.0.3
  Linux (x86)        7.1.0.3
  Linux (x86-64)     7.1.0.3
  Linux (zSeries)    7.1.0.3
  Linux (Power)      7.1.0.3
  zOS                7.1.0.3
  
  Platform           v7.5
  --------           --------------------
  Multiplatforms     7.5.0.1
  
  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

• R710 PSY

     UP