IJ06288: AN ASSERTION AT JVM SHUTDOWN TIME WITH CONCURRENT SCAVENGER

APAR status

• Closed as program error.

Error description

• Error Message: The following assertion might be triggered at JVM
  shutdown when a user is running with -Xgc:concurrentScavenge
  option and on a machine with high number of cores or with
  -Xgcthreads option set to run with large number of GC threads:
  CS not in progress, found a object in Survivor: slot 0X.. object
  0x..
  j9mm.141    *   ** ASSERTION FAILED ** at
  StandardAccessBarrier.cpp:701: ((false))
  .
  Stack Trace: MM_StandardAccessBarrier::preObjectRead at
  StandardAccessBarrier.cpp:700
  internalPreReadObject at ObjectAccessBarrierAPI.hpp:2810
  preIndexableObjectReadObject at ObjectAccessBarrierAPI.hpp:2114
  inlineIndexableObjectReadObject at
  ObjectAccessBarrierAPI.hpp:1819
  aaload at BytecodeInterpreter.hpp:5654
  VM_BytecodeInterpreter::run at BytecodeInterpreter.hpp:9262
  bytecodeLoop at BytecodeInterpreter.cpp:100
  c_cInterpreter () at xcinterp.s:150
  cleanUpAttachedThread at callin.cpp:459
  protectedDestroyJavaVM at jniinv.c:336
  omrsig_protect at omrsignal.c:394
  DestroyJavaVM (javaVM=0x7f1170011940) at jniinv.c:498
  DestroyJavaVM (javaVM=0x7f1170011940) at jvm.c:562
  JavaMain ()
  start_thread
  clone ()
  .
  

Local fix

• This is issue can be avoided by removing -Xgc:concurrentScavenge
  option. This might cause some performance degradation in
  throughput and consistency of response-times as it will disable
  Concurrent Scavenger.
  

Problem summary

• This problem is caused by a special case with initializing
  internal structures for Concurrent Scavenger.
  

Problem conclusion

• The JVM has been updated to handle this initialization case
  correctly in Concurrent Scavenger.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR5 FP16  (8.0.5.16)
  .
  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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