IV11011: MEMORY LEAK WHEN SHMGET() CALL FAILS TO ALLOCATE MEMORY

APAR status

• Closed as program error.

Error description

• Error Message:
  When using the AIX environment Variable EXTSHM=ON, the JVM may
  fail to start or may leak shared memory pages if 64K Large pages
  are in use. The JVM may not properly fall back to using standard
  4K pages.
  In Java 6/5: A memory leak is observed when using 64k pages
  .
  Stack Trace: N/A
  .
  

Local fix

• Java 6.0.1 / R26: Set the environment variable: EXTSHM=OFF
  Java 6/5: Use -Xlp4k as a Java Option
  

Problem summary

• The problem is caused when a call to shmget() fails, the JVM
  does not detach the shared memory using shmdt()
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR10
  5.0.0 SR13
  6.0.1 SR1
  .
  The JVM has been update to ensure it detaches shared memory when
  we fail to get the appropriate page size using shmget()
  

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:

  IV11016

Fix information

• Fixed component name

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R600 PSY

     UP

• R260 PSY

     UP