IV73611: JDMPVIEW LOOPS WHEN OPENING ZOS SYSTEM DUMP

APAR status

• Closed as program error.

Error description

• Error Message: When opening a zOS system dump, the
  sdk/bin/jdmpview tool issues the usual "Loading image from
  DTFJ..." message but does not produce the subsequent messages
  that list JVMs found in the dump, and never returns a prompt to
  the user.
  .
  Stack Trace:
  .
  at java/io/RandomAccessFile.readBytes(Native Method)
  at
  java/io/RandomAccessFile.read(RandomAccessFile.java:394(Compiled
  Code))
  at
  javax/imageio/stream/FileImageInputStream.read(FileImageInputStr
  eam.java:128(Compiled Code))
  at
  com/ibm/j9ddr/corereaders/tdump/zebedee/dumpreader/Dump.read(Dum
  p.java:407(Compiled Code))
  at
  javax/imageio/stream/ImageInputStreamImpl.readFully(ImageInputSt
  reamImpl.java:362(Compiled Code))
  at
  javax/imageio/stream/ImageInputStreamImpl.readFully(ImageInputSt
  reamImpl.java:372(Compiled Code))
  at
  com/ibm/j9ddr/corereaders/tdump/zebedee/dumpreader/AddressSpace.
  read(AddressSpace.java:289(Compiled Code))
  at
  com/ibm/j9ddr/corereaders/tdump/zebedee/dumpreader/AddressSpace.
  getBlockFromCacheOrDisk(AddressSpace.java:356(Compiled Code))
  at
  com/ibm/j9ddr/corereaders/tdump/zebedee/dumpreader/AddressSpace.
  getBlock(AddressSpace.java:341(Compiled Code))
  at
  com/ibm/j9ddr/corereaders/tdump/zebedee/dumpreader/AddressSpace.
  read(AddressSpace.java:376(Compiled Code))
  at
  com/ibm/j9ddr/corereaders/tdump/zebedee/dumpreader/AddressSpaceI
  mageInputStream.read(AddressSpaceImageInputStream.java:48(Compil
  ed Code))
  at
  javax/imageio/stream/ImageInputStreamImpl.readBits(ImageInputStr
  eamImpl.java:696(Compiled Code))
  at
  com/ibm/j9ddr/corereaders/tdump/zebedee/le/CeexcibhTemplate.getC
  ibh_in_use(CeexcibhTemplate.java:48(Compiled Code))
  at
  com/ibm/j9ddr/corereaders/tdump/zebedee/le/DsaStackFrame.findCib
  (DsaStackFrame.java:690(Compiled Code))
  at
  com/ibm/j9ddr/corereaders/tdump/zebedee/le/DsaStackFrame.ceextbc
  k(DsaStackFrame.java:265)
  at
  com/ibm/j9ddr/corereaders/tdump/zebedee/le/DsaStackFrame.<init>(
  DsaStackFrame.java:111)
  
  Java dumps obtained from the JVM
  that is running the jdmpview
  tool show that the tool is looping while reading a chain of zOS
  CIB control blocks in the dump (method DsaStackFrame.findCib()).
  

Local fix

Problem summary

• The problem is caused when the the DTFJ core dump reader
  encounters unexpected data in the system dump.
  

Problem conclusion

• The DTFJ core dump reader has been updated to prevent the loop
  from occurring.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR1 FP10  (8.0.1.10)
     7    SR9 FP 10 (7.0.9.10)
     7 R1 SR3 FP10  (7.1.3.10)
     6 R1 SR8 FP7   (6.1.8.7)
  .
  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