IV23868: DEADLOCK OBSERVED WHILE INTERRUPTING A THREAD DOING SOCKETCHANNEL.OPEN() AFTER APPLYING APAR IV13299

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APAR status

  • Closed as program error.

Error description

  • Error Message: Deadlock occurred when a thread doing
    SocketChannel.open() is interrupted by another thread.
    .
    Stack Trace: "Thread-6" J9VMThread:0x032E0200,
    j9thread_t:0x03E20A28,
    Blocked on: java/lang/Object@0x5BB179B8
    Owned by: "Thread-5"
    (J9VMThread:0x03300D00, java/lang/Thread:0x5BAD0D30)
    Java callstack:
    at java/nio/channels/spi/AbstractSelectableChannel
    .implCloseChannel(AbstractSelectableChannel.java:212)
    at
    java/nio/channels/spi/AbstractInterruptibleChannel$1.interrupt
    (AbstractInterruptibleChannel.java:158)
    at java/lang/Thread.interrupt(Thread.java:525)
    "Thread-5" J9VMThread:0x03300D00, j9thread_t:0x03E238D0,
    Blocked on: java/lang/Thread$ThreadLock@0x5BAD19D8
    Owned by: "Thread-6" (J9VMThread:0x032E0200,
    java/lang/Thread:0x5BAD0C30)
    Java callstack:
    at java/lang/Thread.blockedOn(Thread.java:1071)
    at sun/reflect/NativeMethodAccessorImpl.invoke0(Native Method)
    at sun/reflect/NativeMethodAccessorImpl.invoke
    (NativeMethodAccessorImpl.java:60)
    at sun/reflect/DelegatingMethodAccessorImpl.invoke
    (DelegatingMethodAccessorImpl.java:37)
    at java/lang/reflect/Method.invoke(Method.java:611)
    at sun/misc/SharedSecrets$1.blockedOn(SharedSecrets.java:117)
    at java/nio/channels/spi/AbstractInterruptibleChannel
    .blockedOn(AbstractInterruptibleChannel.java:209)
    at java/nio/channels/spi/AbstractInterruptibleChannel.end
    (AbstractInterruptibleChannel.java:197)
    at
    sun/nio/ch/SocketChannelImpl.connect(SocketChannelImpl.java:530)
    at java/nio/channels/SocketChannel.open(SocketChannel.java:157)
    .
    

Local fix

Problem summary

  • The deadlock occurred due to a lock contention between
    SocketChannel open and interrupt threads when a thread
    establishing a socket connection is interrupted by another
    thread.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.0 SR11
    6.0.1 SR4
    7.0.0 SR3
    .
    JVM NIO channel code is updated to avoid the lock contention
    between SocketChannel open and interrupt threads.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV23868

  • Reported component name

    JAVA CLASS LIBS

  • Reported component ID

    620700130

  • Reported release

    600

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-06-27

  • Closed date

    2012-06-27

  • Last modified date

    2012-11-02

  • 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 CLASS LIBS

  • Fixed component ID

    620700130

Applicable component levels

  • R600 PSY

       UP

  • R700 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Java Class Libraries

Software version:

6.0

Reference #:

IV23868

Modified date:

2012-11-02

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