IZ56227: READ TO A SOCKET BLOCKS CONCURRENT WRITES

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APAR status

  • Closed as program error.

Error description

  • Error Message:
    
    
    .
    Stack Trace:
    
    3XMTHREADINFO      "IM_POOL_THREAD_0" (TID:0x094F9B00,
    sys_thread_t:0x09308D18, state:B, native ID:0x0000164E) prio=5
    4XESTACKTRACE          at
    java/nio/channels/spi/AbstractSelectableChannel.isBlocking(Abstr
    actSelectableChannel.java:257)
    4XESTACKTRACE          at
    java/nio/channels/spi/AbstractInterruptibleChannel.begin(Abstrac
    tInterruptibleChannel.java:180)
    4XESTACKTRACE          at
    sun/nio/ch/SocketChannelImpl.write(SocketChannelImpl.java:326(Co
    mpiled Code))
    4XESTACKTRACE          at
    com/xxxxxx/ca/xmpp/smack/XMPPAsyncConnection$MyWriter.flush(XMPP
    AsyncConnection.java:187(Compiled Code))
    4XESTACKTRACE          at
    java/io/BufferedWriter.flush(BufferedWriter.java:257)
    .
    .
    A blocking read on a socket blocks concurrent writes.
    The writer can be seen waiting in
    AbstractSelectableChannel.isBlocking( ).
    

Local fix

Problem summary

  • Hang scenario is observed due to a feature introduced for better
    performance.
    

Problem conclusion

  • This defect will be fixed in:
    5.0.0 SR?
    .
    JDK codebase is update to avoid the hang scenario caused due a
    feature.
    .
    To obtain the fix:
    Install build 20090916 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ56227

  • Reported component name

    JAVA 5 CLASS LI

  • Reported component ID

    620500130

  • Reported release

    500

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2009-08-03

  • Closed date

    2009-09-17

  • Last modified date

    2009-09-17

  • 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

       UP



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Document information


More support for:

Runtimes for Java Technology
Java Class Libraries

Software version:

5.0

Reference #:

IZ56227

Modified date:

2009-09-17

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