PM03987: DEADLOCK WHEN TRYING TO EXECUTE CREATEPORTLETSHADOWCOMMAND

APAR status

• Closed as program error.

Error description

• In some rare cases it is possible that a deadlock occurs
  because of synchronization in CreatePortletShadowCommand.
  This only happens when one thread executes the commnd for a
  user and a new request for the same user is sent while
  executing.
  
  The two WebContainer threads trying to acquire each other lock:
  WebContainer X:
  Owns Monitor Lock on
  com/ibm/wps/datastore/id/ExtIDImpl@76B97278/76B97284
  Waiting for Monitor Lock on java/lang/Object@93B522F8/93B52304
  at
  com/ibm/wps/ac/impl/FullEntitlementsEngine
  .retrieveExplicitFullE
  ntitlements(FullEntitlementsEngine.java:364(Compiled Code))
  ...
  WebContainer Y:
  Owns Monitor Lock on java/lang/Object@93B522F8/93B52304
  Waiting for Monitor Lock on
  com/ibm/wps/datastore/id/ExtIDImpl@76B97278/76B97284
  at
  com/ibm/ws/cache/CacheEntry.getValue(CacheEntry
  .java:643(Compile
  d Code))
  ...
  

Local fix

Problem summary

• In some rare cases it is possible that a deadlock occurs because
  of synchronization in CreatePortletShadowCommand. This only
  happens when one thread executes the commnd for a user and a new
  request for the same user is sent while executing.
  
  The two WebContainer threads trying to acquire each other lock:
  
     WebContainer X:
     Owns Monitor Lock on
  com/ibm/wps/datastore/id/ExtIDImpl@76B97278/76B97284
     Waiting for Monitor Lock on
  java/lang/Object@93B522F8/93B52304
     at
  com/ibm/wps/ac/impl/FullEntitlementsEngine.retrieveExplicitFullE
  ntitlements(FullEntitlementsEngine.java:364(Compiled Code))
     ...
  
     WebContainer Y:
     Owns Monitor Lock on java/lang/Object@93B522F8/93B52304
     Waiting for Monitor Lock on
  com/ibm/wps/datastore/id/ExtIDImpl@76B97278/76B97284
     at
  com/ibm/ws/cache/CacheEntry.getValue(CacheEntry.java:643(Compile
  d Code))
     ...
  

Problem conclusion

• Removed synchronization on object id and added synchronization
  on lock object.
  
  
  Manual Steps:
     None
  
  Failing Module(s):
     Engine: Tags & Commands
  
  Affected Users:
     All Users
  
  Version Information:
      Portal Version(s): 6.1.0.2
       Pre-Requisite(s):
        Co-Requisite(s): ---
  
  Platform Specific:
     This fix applies to all platforms.
  
  A fix is available from Fix Central:
  
  http://www.ibm.com/eserver/support/fixes/fixcentral/swgquickorde
  r?apar=PM03987&productid=WebSphere%20Portal&brandid=5
  
  You may need to type or paste the complete address into your Web
  browser.
  

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

  WEBSPHERE PORTA

• Fixed component ID

  5724E7600

Applicable component levels

• R61B PSY

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