IV74658: OUTOFMEMORYERROR IN J9DDR CORE READERS WHEN OPENING ZOS SYSTEM D UMP IN JDMPVIEW

APAR status

• Closed as program error.

Error description

• Error Message: Exception in thread "main"
  java.lang.OutOfMemoryError: Java heap space
          at
  javax.imageio.stream.ImageInputStreamImpl.<init>(ImageInputStrea
  mImpl.java:74)
  .
  Stack Trace: at
  com.ibm.j9ddr.corereaders.tdump.zebedee.dumpreader.AddressSpaceI
  mageInputStream.<init>(AddressSpaceImageInputStream.java:40)
          at
  com.ibm.j9ddr.corereaders.tdump.zebedee.dumpreader.AddressSpace.
  getImageInputStream(AddressSpace.java:212)
          at
  com.ibm.j9ddr.corereaders.tdump.zebedee.le.DsaStackFrame.hpclEnt
  ryPoint(DsaStackFrame.java:783)
          at
  com.ibm.j9ddr.corereaders.tdump.zebedee.le.Ceexdsaf.<init>(Ceexd
  saf.java:106)
          at
  com.ibm.j9ddr.corereaders.tdump.zebedee.le.DsaStackFrame.ceextbc
  k(DsaStackFrame.java:257)
          at
  com.ibm.j9ddr.corereaders.tdump.zebedee.le.DsaStackFrame.<init>(
  DsaStackFrame.java:111)
          at
  com.ibm.j9ddr.corereaders.tdump.zebedee.le.DsaStackFrame.getPare
  ntFrame(DsaStackFrame.java:211)
          at
  com.ibm.j9ddr.corereaders.tdump.zebedee.le.Caa$Cel4rreg.getRegis
  tersFromUsta(Caa.java:654)
          at
  com.ibm.j9ddr.corereaders.tdump.zebedee.le.Caa$Cel4rreg.<init>(C
  aa.java:436)
          at
  com.ibm.j9ddr.corereaders.tdump.zebedee.le.Caa.getCurrentFrame(C
  aa.java:800)
          at
  com.ibm.j9ddr.corereaders.tdump.zebedee.le.Caa.getFailingRegiste
  rs(Caa.java:306)
          at
  com.ibm.j9ddr.corereaders.tdump.TDumpReader$TCBAdapter.<init>(TD
  umpReader.java:1167)
          at
  com.ibm.j9ddr.corereaders.tdump.TDumpReader$EdbAdapter.getThread
  s(TDumpReader.java:951)
          at
  com.ibm.j9ddr.corereaders.tdump.TDumpReader$EdbAdapter.getStackS
  ymbols(TDumpReader.java:775)
          at
  com.ibm.j9ddr.corereaders.tdump.TDumpReader$EdbAdapter.loadModul
  es(TDumpReader.java:620)
          at
  com.ibm.j9ddr.corereaders.tdump.TDumpReader$EdbAdapter.getModule
  s(TDumpReader.java:608)
          at
  com.ibm.j9ddr.corereaders.tdump.TDumpReader$EdbAdapter.getModule
  s(TDumpReader.java:495)
          at
  com.ibm.j9ddr.VMDataFactory.getStructureDataFileFromSymbol(VMDat
  aFactory.java:273)
          at
  com.ibm.j9ddr.VMDataFactory.getStructureDataFile(VMDataFactory.j
  ava:230)
          at
  com.ibm.j9ddr.VMDataFactory.getVMData(VMDataFactory.java:97)
          at
  com.ibm.j9ddr.view.dtfj.image.J9DDRImageProcess.getRuntimes(J9DD
  RImageProcess.java:410)
          at
  com.ibm.dtfj.image.j9.ImageFactory.hasJavaRuntime(ImageFactory.j
  ava:428)
          at
  com.ibm.dtfj.image.j9.ImageFactory.foundImage(ImageFactory.java:
  359)
          at
  com.ibm.dtfj.image.j9.ImageFactory.getImage(ImageFactory.java:19
  1)
          at
  com.ibm.jvm.dtfjview.commands.OpenCommand.imagesFromCommandLine(
  OpenCommand.java:102)
          at
  com.ibm.jvm.dtfjview.commands.OpenCommand.run(OpenCommand.java:7
  0)
          at
  com.ibm.java.diagnostics.utils.Context.tryCommand(Context.java:1
  30)
          at
  com.ibm.java.diagnostics.utils.Context.execute(Context.java:86)
          at
  com.ibm.jvm.dtfjview.CombinedContext.execute(CombinedContext.jav
  a:162)
          at
  com.ibm.jvm.dtfjview.CombinedContext.execute(CombinedContext.jav
  a:146)
          at
  com.ibm.jvm.dtfjview.Session.imageFromCommandLine(Session.java:5
  85)
          at
  com.ibm.jvm.dtfjview.Session.sessionInit(Session.java:197)
          at com.ibm.jvm.dtfjview.Session.<init>(Session.java:154)
          at
  com.ibm.jvm.dtfjview.Session.getInstance(Session.java:150)
          at
  com.ibm.jvm.dtfjview.DTFJView.launch(DTFJView.java:39)
          at com.ibm.jvm.dtfjview.DTFJView.main(DTFJView.java:34)
  .
  Prior to the OutOfMemoryError, a loop occurs in the j9ddr core
  readers while walking the native stack frames (zOS DSA control
  blocks).
  

Local fix

Problem summary

• Problem is caused when jdmpview is walking the native stacks in
  a zOS system dump.
  

Problem conclusion

• The j9ddr core readers used by the jdmpview tool have been
  updated to prevent the loop and OutOfMemoryError from occurring.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR2       (8.0.2.0)
     6 R1 SR9       (6.1.9.0)
     7 R1 SR4       (7.1.4.0)
     7    SR10      (7.0.10.0)
  .
  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

     UP

• R260 PSY

     UP