PI50660: A MEMORY LEAK MAY OCCUR IN WORKLIGHT SERVER V7.0 AND V7.1

IBM MobileFirst Platform Foundation Interim Fix README for 7.1
IBM MobileFirst Platform Foundation Interim Fix README for 7.0

APAR status

• Closed as program error.

Error description

• Worklight Server v7.0 and v7.1 may experience a memory leak,
  resulting in a out of memory event.
  
  The reason for the memory leak is one of the "Default
  Executor-thread-xxxx" threads being deadlocked, waitng for "
  com/worklight/core/auth/impl/AuthenticationContext",
  as can be seen in a javacore dump:
  
  1LKDEADLOCK    Deadlock detected !!!
  NULL           ---------------------
  NULL
  2LKDEADLOCKTHR  Thread "Default Executor-thread-4858"
  (0x00000000F02BBD00)
  3LKDEADLOCKWTR    is waiting for:
  4LKDEADLOCKMON      sys_mon_t:0x00007F85BA192538 infl_mon_t:
  0x00007F85BA1925B0:
  4LKDEADLOCKOBJ
  com/worklight/core/auth/impl/AuthenticationContext@0x00000000183
  4C650
  3LKDEADLOCKOWN    which is owned by:
  2LKDEADLOCKTHR  Thread "Default Executor-thread-4846"
  (0x00000000F08DEB00)
  3LKDEADLOCKWTR    which is waiting for:
  4LKDEADLOCKMON      sys_mon_t:0x00007F85BA10C158 infl_mon_t:
  0x00007F85BA10C1D0:
  4LKDEADLOCKOBJ
  com/ibm/ws/session/store/memory/MemorySession@0x00000000196C9170
  3LKDEADLOCKOWN    which is owned by:
  2LKDEADLOCKTHR  Thread "Default Executor-thread-4858"
  (0x00000000F02BBD00)
  NULL
  NULL
  ----------------------------------------------------------------
  --------
  
  As a result of this deadlock, Worklight Server won't clean up
  old sessions, resulting in the number of sessions
  (com.ibm.ws.session.store.memory.MemorySession class in a heap
  dump) continuosly growing.
  Eventually, Worklight Server may run out of memory.
  
  
  Additional Keywords:
  
  Worklight Versions Affected: 7.0. 7.1
  
  Initial Impact: High
  

Local fix

• Restart Worklight Server
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Administrators of a Worklight server who use V7.0            *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Worklight Server v7.0 and v7.1 may experience a memory leak, *
  * resulting in an out of memory event.                         *
  * The reason for the memory leak is a number of threads enter  *
  * a deadlock                                                   *
  * As a result of this deadlocks, Worklight Server won't clean  *
  * up old sessions, resulting in the number of sessions         *
  * continuously growing.                                        *
  * Eventually, Worklight Server may run out of memory.          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * -                                                            *
  ****************************************************************
  

Problem conclusion

• code was changed to prevent threads from entering a deadlock
  

Temporary fix

• Restart Worklight Server
  

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

  MFPF/WORKLIGHT

• Fixed component ID

  5725I4301

Applicable component levels

• R700 PSY

     UP

• R710 PSY

     UP