IV39172: TRACEASSERT FAILED AT TRACEPOINT J9MM.479 IN PARALLELSCAVENGER

APAR status

• Closed as program error.

Error description

• Error Message: A dump event "traceassert" received with the
  following message from the snap trace:
  j9mm.479  Assert    * ** ASSERTION FAILED ** at
  ParallelScavenger.cpp
  .
  Stack Trace: Native stack trace:
  {libj9prt26.so}{genSystemCoreUsingGencore}
  {libj9prt26.so}{j9dump_create}
  {libj9dmp26.so}{doSystemDump}
  {libj9dmp26.so}{protectedDumpFunction}
  {libj9prt26.so}{j9sig_protect}
  {libj9dmp26.so}{runDumpFunction}
  {libj9dmp26.so}{runDumpAgent}
  {libj9dmp26.so}{triggerDumpAgents}
  {libj9trc26.so}{twAssertion}
  {libj9ute26.so}{logTracePoint}
  {libj9ute26.so}{utsTraceV}
  {libj9trc26.so}{j9Trace}
  {libj9gc26.so}{doStackSlot__31MM_ParallelScavengerRootScannerFPP
  8J9ObjectPvPCv}
  {libj9gc26.so}{stackSlotIterator__FP8J9JavaVMPP8J9ObjectPvP16J9S
  tackWalkStatePCv}
  {libj9gc26.so}{vmThreadStackDoOSlotIterator__FP10J9VMThreadP16J9
  StackWalkStatePP8J9ObjectPCv}
  {libj9vm26.so}{walkJNIRefs}
  {libj9vm26.so}{walkPushedJNIRefs}
  {libj9vm26.so}{walkJITJNICalloutFrame}
  {libj9vm26.so}{walkStackFrames}
  {libj9gc26.so}{scanSlots__28GC_VMThreadStackSlotIteratorFP10J9VM
  ThreadT1PvPFP8J9JavaVMPP8J9ObjectPvP16J9StackWalkStatePCv_vbT5}
  {libj9gc26.so}{scanOneThread__14MM_RootScannerFP20MM_Environment
  ModronP10J9VMThreadPv}
  {libj9gc26.so}{scanThreads__14MM_RootScannerFP20MM_EnvironmentMo
  dron}
  {libj9gc26.so}{scanRoots__14MM_RootScannerFP20MM_EnvironmentModr
  on}
  {libj9gc26.so}{scavengeRoots__20MM_ParallelScavengerFP22MM_Envir
  onmentStandard}
  {libj9gc26.so}{workThreadGarbageCollect__20MM_ParallelScavengerF
  P22MM_EnvironmentStandard}
  {libj9gc26.so}{run__23MM_ParallelScavengeTaskFP20MM_EnvironmentM
  odron}
  {libj9gc26.so}{slaveEntryPoint__21MM_ParallelDispatcherFP20MM_En
  vironmentModron}
  {libj9gc26.so}{dispatcher_thread_proc2__FP13J9PortLibraryPv}
  .
  

Local fix

Problem summary

• The problem is caused by an unnecessary function call with an
  uninitialized object slot.
  

Problem conclusion

• This defect will be fixed in:
  6.0.1 SR6
  7.0.0 SR5
  6.0.0 SR14
  .
  The JVM has been updated so that the obsolete method call is
  removed.
  

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

• R600 PSY

     UP