IV61966: CRASHES AND ASSERTS WITH LARGE CUSTOMIZED TLHMINIMUMSIZE

APAR status

• Closed as program error.

Error description

• Error Message: ASSERTION FAILED ** at
  LargeObjectAllocateStats.cpp:<xxxx>: ((false && (sizeClassIndex
  < _tlhAllocSizeClassStats._maxSizeClasses)))
  or
  Unhandled exceptionType=Segmentation error vmState=0x0002000f
  
  .
  Stack Trace: N/A
  .
  The issue only occurs when using the command line option
  -Xgc:tlhMinimumSize=<xxxx> and the value specified exceeds
  512.The issue only occurs when using the gencon GC policy.
  

Local fix

• Discontinue use of the -Xgc:tlhMinimumSize=<xxxx> command line
  option, or specify all of the following
  options:-Xgc:tlhMinimumSize=<xxxx>
  -Xgc:tlhSurvivorDiscardThreshold=<yyyy>
  -Xgc:tlhTenureDiscardThreshold=<zzzz>such that both zzzz and
  yyyy are greater than or equal to xxxx.
  

Problem summary

• The problem is caused by the JVM mistakenly using the value of
  tlhMinimumSize instead of tlhSurvivorDiscardThreshold and
  tlhTenureDiscardThreshold in certain cases.
  

Problem conclusion

• The JVM has been updated to correctly to use the values of
  tlhSurvivorDiscardThreshold and tlhTenureDiscardThreshold in all
  cases.
  .
  This APAR will be fixed in the following Java Releases:
     7 R1 SR2       (7.1.2.0)
     7    SR8       (7.0.8.0)
     6 R1 SR8 FP2   (6.1.8.2)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, Java maintenance is available
  from:
             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

     UP

• R260 PSY

     UP