IV01674: MISSING REFERENCES BETWEEN SOME OBJECTS IN A PHD HEAP DUMP

APAR status

• Closed as program error.

Error description

• Error Message: N/A
  .
  Stack Trace: N/A
  .
  When using a phd file and Memory Analyzer to diagnose memory
  usage issues there were references missing between objects on
  the heap that the user knew would have referenced each other.
  

Local fix

• Memory Analyzer can use a system dump as well as a heap dump. A
  system dump can be taken instead of a heap dump and used to
  diagnose heap usage issues.
  System dumps are significantly larger than heap dumps and more
  free disk space may be required in order to use them.
  

Problem summary

• PHD heapdumps were missing references between objects located in
  different parts of the heap. References between objects in the
  tenured and nursery areas were not being included in the phd
  files generated when a heap dump occurred.
  This problem only occurred when using the gencon gc policy.
  

Problem conclusion

• This defect will be fixed in:
  6.0.1 GA FP1
  .
  The JVM heapdump generator has been updated to include
  references that cross different regions of the heap in the PHD
  file.
  .
  To obtain the fix:
  Install build 20110222 or later
  

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

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R260 PSY

     UP