IV34500: A 'TRACEASSERT' DUMP EVENT OCCURS DURING A CALL TO JAVA/LANG/SEC URITYMANAGER.GETCLASSCONTEXT() WHILE LOOKING UP A JAVA/LANG/INVO

APAR status

• Closed as program error.

Error description

• Error Message: A dump event "traceassert" is received.  The snap
  trace file show the following message:
  
    ASSERTION FAILED at sunvmi.c:498: ((accessClass) != NULL)
  .
  Stack Trace: This is the native stack trace:
  
    j9dump_create () from libj9prt26.so
    doSystemDump () from libj9dmp26.so
    j9sig_protect () from libj9prt26.so
    runDumpFunction () from libj9dmp26.so
    runDumpAgent () from libj9dmp26.so
    triggerDumpAgents () from libj9dmp26.so
    twAssertion () from libj9trc26.so
    utsTraceV () from libj9ute26.so
    j9Trace () from libj9trc26.so
    getClassContextIterator () from libjclse7b_26.so
    walkFrame () from libj9vm26.so
    walkStackFrames () from libj9vm26.so
    JVM_GetClassContext () from libjclse7b_26.so
  
    The Java stack trace will be similar to:
  
    at java/lang/SecurityManager.getClassContext
    at Helper.<clinit>
    at java/lang/J9VMInternals.initializeImpl
    at java/lang/J9VMInternals.initialize
    at java/lang/invoke/MethodHandle.lookupMethod
    at java/lang/invoke/MethodHandle.finishMethodInitialization
    at java/lang/invoke/DirectHandle.<init>
    at java/lang/invoke/MethodHandles$Lookup.findStatic
  .
  This only affects Java 7
  

Local fix

• Ensure that classes that call getClassContext() in <clinit> have
  been initialized prior to attempting to look up MethodHandles
  for their methods or fields.
  

Problem summary

• The problem is due to an invalid assumption regarding when
  SecurityManager.getClassContext() can be called while looking up
  a java.lang.invoke.MethodHandle.
  

Problem conclusion

• This defect will be fixed in:
  7.0.0 SR4
  .
   The JVM has been changed to only validate the assumption in the
  correct code path.
  

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

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