PM37635: HANG IN ASESSWEBINVOCATIONCOLLABORATOR.JAVA IN PREINVOKE STATUS LEADS TO POSSIBLE HTTP REQUEST TIMEOUT AND EC3 ABEND

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• It is possible that WAS can ignore a notifcation that an
  Activity completed.  If the Activity Session (AS) then times
  out there is a possibility that the AS can hang pending a
  notification.  At this point depending on server configuration
  the thread will either hang or cause an HTTP request time out.
  Also, depending on the server configuration the HTTP request
  time out can cause an EC3 ABEND.
  
  The hung thread Java Stack:
  Java stack:
  -----------
  
  Method
  Location
  ------
  --------
  java/lang/Object.wait
  Object.java
  java/lang/Object.wait
  Object.java:199
  com/ibm/ws/ActivitySession/ASessWebInvocationCollaborator.preInv
  oke          ASessWebInvocationCollaborator.java:211
  com/ibm/ws/wswebcontainer/servlet/ServletWrapper.handleRequest
  ServletWrapper.java:461
  com/ibm/ws/webcontainer/servlet/CacheServletWrapper.handleReques
  t            CacheServletWrapper.java:90
  com/ibm/ws/webcontainer/WebContainer.handleRequest
  WebContainer.java:744
  com/ibm/ws/wswebcontainer/WebContainer.handleRequest
  WebContainer.java:1455
  com/ibm/ws/webcontainer/channel/WCChannelLink.ready
  WCChannelLink.java:115
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere Application           *
  *                 Server V7.0                                  *
  *                                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: If an Activity Session (AS) that is     *
  *                      linked to an HTTP Session times out     *
  *                      when the request is with the client,    *
  *                      the AS can hang when the request is     *
  *                      received back on the server, pending    *
  *                      a notification that the state has       *
  *                      changed.  This notification will        *
  *                      never occur. The thread hang shows      *
  *                      the following stack :                   *
  *                                                              *
  *                      com/ibm/ws/ActivitySession/ASessWebInvo *
  *                      cationCollaborator.preInvoke            *
  *                      ASessWebInvocationCollaborator.java:211 *
  *                      com/ibm/ws/wswebcontainer/servlet/Servl *
  *                      etWrapper.handleRequest                 *
  *                      ServletWrapper.java:461                 *
  *                      com/ibm/ws/webcontainer/servlet/CacheSe *
  *                      rvletWrapper.handleRequest              *
  *                      CacheServletWrapper.java:90             *
  *                      com/ibm/ws/webcontainer/WebContainer.ha *
  *                      ndleRequest WebContainer.java:744       *
  *                      com/ibm/ws/wswebcontainer/WebContainer. *
  *                      handleRequest WebContainer.java:1455    *
  *                      com/ibm/ws/webcontainer/channel/WCChann *
  *                      elLink.ready WCChannelLink.java:115     *
  *                                                              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When an Activity Session that is linked to an HTTP Session
  times out, the timeout is processed immediately, and the
  Activity is completed as designed.  However, if the timeout
  occurs during the period when the request is back with the
  client, the next linked HTTP request that arrives attempts to
  resume the linked Activity Session, which succeeds even though
  the Activity is now completed.  During subsequent processing
  of incoming requests, the Activity Session state is now
  incorrect, and the processing thread hangs in the collaborator
  preinvoke.
  

Problem conclusion

• Correct the timeout processing of an Activity Session linked
  to an HTTP Session, in the circumstances when the timeout
  occurs when the request is back with the client.
  
  APAR PM37635 is currently targeted for inclusion in Service
  Level (Fix Pack) 7.0.0.17 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:

  PM24502

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

Modules/Macros

• BBGUBINF BBOUBINF
  

Fix information

• Fixed component name

  WEBSPHERE FOR Z

• Fixed component ID

  5655I3500

Applicable component levels

• R700 PSY UK67335

     UP11/05/19 P F105

Fix is available

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