IV29156: JDK CRASHES IN GC WHEN CLASS REDEFINITION IS USED WITH THE GENCO N GC POLICY

APAR status

• Closed as program error.

Error description

• Error Message: A dump event "gpf" or "traceassert" is received.
  .
  Stack Trace: Native stack trace:
  
     MM_MarkingScheme::scanClass+0xa96
     MM_MarkingScheme::completeClassMark+0x150
     MM_MarkingScheme::markLiveObjectsScan+0x64
     MM_ParallelMarkTask::run+0x3c
     MM_Dispatcher::run+0x35
     MM_ParallelGlobalGC::markAll+0xcd
     MM_ParallelGlobalGC::masterThreadGarbageCollect+0x174
     MM_ConcurrentGC::internalGarbageCollect+0x22
     MM_Collector::garbageCollect+0x214
     MM_MemorySubSpace::systemGarbageCollect+0x6a
  .
  

Local fix

• This issue can be worked around using -Xgcpolicy:optthruput
  option.
  

Problem summary

• The problem is caused when the garbage collector tries to scan
  the static field of a redefined class.
    This issue only happens if JIT is disabled or the JDK is under
  the java debugger.
  

Problem conclusion

• This defect will be fixed in:
  6.0.1 SR4
  7.0.0 SR3
  6.0.0 SR12
  .
    The JVM has been updated to prevent the crash from occurring
  when the garbage collector scans redefined classes.
  

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