IV39749: JVMTI GETOWNEDMONITORINFO FUNCTION RETURNS CORRUPTED MEMORY POIN TER

APAR status

• Closed as program error.

Error description

• Error Message: JVM Trace assert "** ASSERTION FAILED ** at
  common/j9memtag.c:145: ((memoryCorruptionDetected))" is received
  when JVMTI agent deallocates the GetOwnedMonitorInfo returned
  memory pointer.
  .
  Stack Trace: The native stack trace will appear similar to:
  twAssertion
  logTracePoint
  utsTraceV
  j9Trace+0x4c
  unwrapBlockAndCheckTags+0xc0
  j9mem_free_memory+0x40
  jvmtiDeallocate+0x4b
  JvmtiAutoFree@jdwp
  Execute@OwnedMonitorsHandler@ThreadReference@jdwp
  Run@SyncCommandHandler@jdwp
  ExecCommand@CommandDispatcher@jdwp
  Run@PacketDispatcher@jdwp
  StartFunction@PacketDispatcher@jdwp
  .
  

Local fix

Problem summary

• The problem occurs when the thread which is being queried
  successfully enters a monitor during execution of the
  GetOwnedMonitorInfo function.
  

Problem conclusion

• This defect will be fixed in:
  7.0.0 SR7
  6.0.1 SR8
  6.0.0 SR16
  .
  The JVM has been updated such that GetOwnedMonitorInfo correctly
  deals with this situation..
  

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