IZ78262: CRASH IN POLLARRAYWRAPPER CODE

APAR status

• Closed as program error.

Error description

• Error Message: This crash happens in Compiled code of
  PollArrayWrapper in windows, when JIT and IPV6 are enabled for
  the application.
  .
  Stack Trace: at
  sun/nio/ch/PollArrayWrapper.putEventOps(PollArrayWrapper.java:11
  5(Compiled Code))
    at
  sun/nio/ch/PollArrayWrapper.addWakeupSocket(PollArrayWrapper.jav
  a:143)
    at
  sun/nio/ch/WindowsSelectorImpl.growIfNeeded(WindowsSelectorImpl.
  java:640(Compiled Code))
    at
  sun/nio/ch/WindowsSelectorImpl.implRegister(WindowsSelectorImpl.
  java:608(Compiled Code))
    at
  sun/nio/ch/SelectorImpl.register(SelectorImpl.java:152(Compiled
  Code))
    at
  java/nio/channels/spi/AbstractSelectableChannel.register(Abstrac
  tSelectableChannel.java:206(Compiled Code))
    at
  com/ibm/mq/communications/NonBlockingServerWorker.add(NonBlockin
  gServerWorker.java:67(Compiled Code))
    at
  com/ibm/mq/communications/NonBlockingListener.run(NonBlockingLis
  tener.java:235)
    at java/lang/Thread.run(Thread.java:811)
                      (or)
    at
  sun/nio/ch/PollArrayWrapper.putDescriptor(PollArrayWrapper.java:
  138(Compiled Code))
    at
  sun/nio/ch/PollArrayWrapper.replaceEntry(PollArrayWrapper.java:1
  10(Compiled Code))
    at sun/nio/ch/PollArrayWrapper.grow(PollArrayWrapper.java:125)
    at
  sun/nio/ch/WindowsSelectorImpl.growIfNeeded(WindowsSelectorImpl.
  java:637(Compiled Code))
    at
  sun/nio/ch/WindowsSelectorImpl.implRegister(WindowsSelectorImpl.
  java:608(Compiled Code))
    at
  sun/nio/ch/SelectorImpl.register(SelectorImpl.java:152(Compiled
  Code))
    at
  java/nio/channels/spi/AbstractSelectableChannel.register(Abstrac
  tSelectableChannel.java:206(Compiled Code))
    at
  com/ibm/mq/communications/NonBlockingServerWorker.add(NonBlockin
  gServerWorker.java:67(Compiled Code))
    at
  com/ibm/mq/communications/NonBlockingListener.run(NonBlockingLis
  tener.java:211)
    at java/lang/Thread.run(Thread.java:811)
  .
  

Local fix

• The crash might not occur, when JIT is disabled or IPV6 is not
  used.
  

Problem summary

• The code added to support IPV6 had a bug that leads to incorrect
  manipulations of the pollarray, leading to crash with either of
  the above stacks.
  

Problem conclusion

• This defect will be fixed in:
  5.0.0 SR12 FP2
  .
  The JVM is modified to make the right array operations and
  thereby avoid the crash.
  .
  To obtain the fix:
  Install build 20100826 or later
  

Temporary fix

• N/A
  

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

  JAVA 5 CLASS LI

• Fixed component ID

  620500130

Applicable component levels

• R500 PSN

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