IJ08375: CRASH DURING HARDWARE GENERATED GUARDED STORAGE EVENT WITHIN A TRANSACTIONAL EXECUTION REGION WHEN RUNNING WITH -XGC:CONCURRENTS

APAR status

• Closed as program error.

Error description

• Error Message: The crash may be inside of the J9ReadBarrier
  handling, for example
  GC_ObjectModelDelegate::calculateObjectDetailsForCopy or a
  similar GC function. The symptom is a bad forwarded object or
  corrupted object.
  .
  Stack Trace:
  ExtraSymbolsModule::GC_ObjectModelDelegate::calculateObjectDetai
  lsForCopy(MM_EnvironmentBase*,MM_ForwardedHeade...+0x4e
  ExtraSymbolsModule::MM_Scavenger::copy(MM_EnvironmentStandard*,M
  M_ForwardedHeader*)+0xcc
  ExtraSymbolsModule::MM_Scavenger::copyObject(MM_EnvironmentStand
  ard*,MM_ForwardedHeader*)+0x18
  ExtraSymbolsModule::MM_StandardAccessBarrier::preObjectRead(J9VM
  Thread*,J9Object*,unsigned int*)+0x55c
  ExtraSymbolsModule::J9ReadBarrier+0x4e
  lib/s390x/compressedrefs/libj9vm29.so::invokeJ9ReadBarrier+0x30
  lib/s390x/compressedrefs/libj9vm29.so::handleGuardedStorageEvent
  +0x7e
  .
  

Local fix

• This problem can be worked around by either not running with
  -Xgc:concurrentScavenge or by disabling transactional memory in
  the JIT compiler via -Xjit:disableTM,disableTLE
  

Problem summary

• The problem is outlined in detail in the pull request which
  fixes the issue: https://github.com/eclipse/openj9/pull/2545
  

Problem conclusion

• The JIT compiler has been updated to avoid the problem.
  .
  This APAR will be fixed in the following Java Releases:
   8 SR5 FP21 (8.0.5.21)
  Except with z/OS where this APAR is fixed in:
   8 SR5 FP22 (8.0.5.22)
  .
  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:

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels