IV90617: POSSIBLE ASSERTION WHEN AGENT IS USED WITH BALANCED GC

APAR status

• Closed as program error.

Error description

• Error Message: <OSB>ERR<CSB> 02:02:51.779 0x122996900
  j9mm.107    *   ** ASSERTION FAILED ** at
  MarkMapManager.cpp:197: ((false && ((0) !=
  _deleteEventShadowMarkMap)))
  .
  Stack Trace: genSystemCoreUsingGencore() at 0x900000007d13278
  omrdump_create() at 0x900000007d12810
  doSystemDump() at 0x900000007d58ef0
  protectedDumpFunction() at 0x900000007d5fa94
  omrsig_protect() at 0x900000007d0e9fc
  runDumpAgent() at 0x900000007d5f788
  triggerDumpAgents() at 0x900000007d8f194
  doTriggerActionAssertDumpEvent() at 0x900000007dbebc0
  triggerHit() at 0x900000007ddad54
  logTracePoint() at 0x900000007dcd348
  doTracePoint() at 0x900000007dcdcd0
  javaTrace() at 0x900000007dc1898
  MM_MarkMapManager::savePreviousMarkMapForDeleteEvents(MM_Environ
  mentVLHGC*)() at 0x90000000938f3c8
  MM_IncrementalGenerationalGC::partialGarbageCollectUsingMarkComp
  act(MM_EnvironmentVLHGC*,MM_AllocateDescription*)() at
  0x90000000929dde8
  MM_IncrementalGenerationalGC::partialGarbageCollect(MM_Environme
  ntVLHGC*,MM_AllocateDescription*)() at 0x90000000929914c
  MM_IncrementalGenerationalGC::runPartialGarbageCollect(MM_Enviro
  nmentVLHGC*,MM_AllocateDescription*)() at 0x9000000092931b4
  MM_IncrementalGenerationalGC::masterThreadGarbageCollect(MM_Envi
  ronmentBase*,MM_AllocateDescription*,bool,bool)() at
  0x900000009292f20
  MM_MasterGCThread::garbageCollect(MM_EnvironmentBase*,MM_Allocat
  eDescription*)() at 0x900000009389d9c
  MM_IncrementalGenerationalGC::taxationEntryPoint(MM_EnvironmentB
  ase*,MM_MemorySubSpace*,MM_AllocateDescription*)() at
  0x900000009298000
  MM_MemorySubSpaceTarok::replenishAllocationContextFailed(MM_Envi
  ronmentBase*,MM_MemorySubSpace*,MM_AllocationContext*,MM_ObjectA
  llocationInterface*,MM_AllocateDescription*,MM_MemorySubSpace::A
  llocationType)() at 0x9000000092fa180
  MM_AllocationContextBalanced::allocateTLH(MM_EnvironmentBase*,MM
  _AllocateDescription*,MM_ObjectAllocationInterface*,bool)() at
  0x9000000092ed048
  MM_TLHAllocationSupport::refresh(MM_EnvironmentBase*,MM_Allocate
  Description*,bool)() at 0x900000009234840
  MM_TLHAllocationSupport::allocateFromTLH(MM_EnvironmentBase*,MM_
  AllocateDescription*,bool)() at 0x900000009234c7c
  MM_TLHAllocationInterface::allocateObject(MM_EnvironmentBase*,MM
  _AllocateDescription*,MM_MemorySpace*,bool)() at
  0x90000000923348c
  MM_MixedObjectAllocationModel::allocateMixedObject(MM_Environmen
  tBase*,MM_AllocateDescriptionJava*,bool)() at 0x90000000922a2ec
  J9AllocateObject() at 0x900000009228090
  bytecodeLoop() at 0x900000007bdde98
  c_cInterpreter(), line 1640 in "pcinterp.s"
  runJavaThread() at 0x900000007ad6e04
  javaProtectedThreadProc() at 0x900000007a97bf8
  omrsig_protect() at 0x900000007d0e9fc
  javaThreadProc() at 0x900000007a979e8
  thread_wrapper() at 0x900000007ca2b0c
  .
  

Local fix

• Use different GC policy. Do not use agent
  

Problem summary

• In certain conditions Partial GC in Balanced might occur earlier
  than the dedicated GC Master Thread is started. This is normal
  behavior however the initialization of hooks required for the
  functioning of JVMTI might be not complete and can be a reason
  for assertion.
  

Problem conclusion

• The initialization of hooks is now completed earlier.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR3 FP21  (8.0.3.21)
  .
  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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