IV57386: DTFJ API LOOPS WHILE WALKING JAVA THREADS

APAR status

• Closed as program error.

Error description

• Error Message: When processing a system dump, DTFJ API loops
  while walking the Java threads.
  .
  Stack Trace: <OSB>2/18/14 10:08:46:428 EST<CSB> 00000031
  com.ibm.j9ddr.vm23.events   Error getting next
  itemcom.ibm.j9ddr.corereaders.memory.MemoryFault: Memory Fault
  reading 0x3C6EE1B8at
  com.ibm.j9ddr.corereaders.memory.AbstractMemory.getBytesAt(Abstr
  actMemory.java:173)at
  com.ibm.j9ddr.corereaders.memory.AbstractMemory.getBytesAt(Abstr
  actMemory.java:165)at
  com.ibm.j9ddr.corereaders.memory.AbstractMemory.getIntAt(Abstrac
  tMemory.java:215)at
  com.ibm.j9ddr.corereaders.memory.ProcessAddressSpace.getPointerA
  t(ProcessAddressSpace.java:65)at
  com.ibm.j9ddr.vm23.pointer.AbstractPointer.getPointerAtOffset(Ab
  stractPointer.java:259)at
  com.ibm.j9ddr.vm23.pointer.generated.J9VMThreadPointer.linkNext(
  J9VMThreadPointer.java:1253)at
  com.ibm.j9ddr.vm23.j9.gc.GCVMThreadListIterator.next(GCVMThreadL
  istIterator.java:58)at
  com.ibm.j9ddr.vm23.view.dtfj.java.DTFJJavaRuntime.getThreads(DTF
  JJavaRuntime.java:658)at
  org.eclipse.mat.dtfj.DTFJIndexBuilder.currentRuntime(DTFJIndexBu
  ilder.java:5237)at
  org.eclipse.mat.dtfj.DTFJIndexBuilder.getRuntime(DTFJIndexBuilde
  r.java:4941)at
  org.eclipse.mat.dtfj.DTFJIndexBuilder.fill(DTFJIndexBuilder.java
  :909)at
  org.eclipse.mat.parser.internal.SnapshotFactoryImpl.parse(Snapsh
  otFactoryImpl.java:231)at
  org.eclipse.mat.parser.internal.SnapshotFactoryImpl.openSnapshot
  (SnapshotFactoryImpl.java:135)at
  org.eclipse.mat.snapshot.SnapshotFactory.openSnapshot(SnapshotFa
  ctory.java:145)at
  org.eclipse.mat.ui.snapshot.ParseHeapDumpJob.run(ParseHeapDumpJo
  b.java:88)at
  org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
  .
  The problem is triggered by specific corruption or in-flight
  data in the system dump.
  

Local fix

Problem summary

• The problem is caused by incorrect handling of an error
  condition in the DTFJ API.
  

Problem conclusion

• This APAR will be fixed in the following Java Releases:
     7 R1 SR1       (7.1.1.0)
  .
  The DTFJ API has been fixed to handle the error condition
  correctly.
  

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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