IV16934: DEADLOCK MAY HAPPEN WHEN A THREAD FAILS TO START

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: The following message shows up in the Java core
    file:
    
                    Deadlock detected !!!
                    ---------------------
                     Thread "T1" (0x4AA98600)
                       is waiting for:
                         sys_mon_t:0x6DBD39E0 infl_mon_t:
    0x6DBD3A18:
    
    java/lang/ThreadGroup$ChildrenThreadsLock@0x1EFEDD60/0x1EFEDD6C:
                       which is owned by:
                     Thread "T2" (0x51D78900)
                       which is waiting for:
                         sys_mon_t:0x6CD150F8 infl_mon_t:
    0x6CD15130:
    
    java/lang/Thread$ThreadLock@0x3D7AD6C0/0x3D7AD6CC:
                       which is owned by:
                     Thread "T1" (0x4AA98600)
    .
    Stack Trace: Thread "T1" has the following Java callstack:
                            at
    java/lang/ThreadGroup.remove(ThreadGroup.java)
                            at java/lang/Thread.start(Thread.java)
                            ......
                    Thread "T2" has the following Java callstack:
                            at java/lang/Thread.isAlive(Thread.java)
                            at
    java/lang/ThreadGroup.activeCount(ThreadGroup.java)
                            at
    java/lang/Thread.activeCount(Thread.java)
                            ......
    .
    

Local fix

Problem summary

  • Deadlock may happen if a thread fails to start and at the same
    time another thread is enumerating the thread group of the
    starting thread.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.0 SR11
    6.0.1 SR3
    7.0.0 SR2
    .
                           The JVM has been updated to prevent the
    dead lock from occurring when a thread fails to start.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV16934

  • Reported component name

    J9 COMMON CODE

  • Reported component ID

    620700127

  • Reported release

    600

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-03-13

  • Closed date

    2012-04-07

  • Last modified date

    2012-04-07

  • 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

  • R600 PSY

       UP

  • R260 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Virtual Machine

Software version:

6.0

Reference #:

IV16934

Modified date:

2012-04-07

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