IJ12237: CORRUPTED VERBOSEGC REMEMBERED SET COUNT

APAR status

• Closed as program error.

Error description

• Error Message: remembered-set count can show very large number
  mistakenly:
  remembered-set count="18446744073709551598
  .
  Stack Trace: N/A
  .
  

Local fix

Problem summary

• During percolate GC cycles, when a scavenge is backed out and
  converted into a global GC, the remembered-set count is not
  updated correctly, and might be decremented below zero. The
  value is stored as a 64-bit unsigned integer, so the result of
  the underflow is a very large positive value.
  This is a reporting problem only, and does not effect other
  functionality.
  

Problem conclusion

• The remembered-set count update logic has been fixed to ensure
  that the correct value is calculated when scavenges are backed
  out.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR5 FP30  (8.0.5.30)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  Service Refreshes and Fix Packs can be found at:
             https://www.ibm.com/developerworks/java/jdk/
  

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

• R270 PSY

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