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IV42769: THREAD STACKS MISSING IN JAVACORE.TXT FILES

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APAR status

  • Closed as program error.

Error description

  • Error Message: When a javacore is triggered on the system the
    generated javacore.txt file does not contain the "Thread Detail"
    section after the "JVM Thread Pool Info" section. The details of
    each individual thread are missing.
    This message is in the javacore.txt file after the "JVM Thread
    Pool Info" section:
    1INTERNAL      An exception occurred attempting to access
    in-flight data. Internal diagnostics:
    .
    Stack Trace:
    .
    The thread counts in the "JVM Thread Pool Info" section will
    have indicated a large number of threads were running.
    

Local fix

Problem summary

  • The large number of threads running in the JVM caused a problem
    when gathering the information on the native threads for each
    java thread.
    

Problem conclusion

  • This defect will be fixed in:
    7.0.0 SR5
    6.0.1 SR6
    .
    The JVM has been updated to detect this situation and
    automatically adjust to displaying only the Java stacks for each
    thread.
    In the event that the JVM does not detect and recover from this
    situation the collection of native stack information can be
    completely disable by turning off the "preempt" request flag
    when taking javacores. By default the request flags are
    "exclusive+preempt". To change this setting globally the
    defaults can be changed on the command line with:
    -Xdump:java:defaults:request=exclusive
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV42769

  • Reported component name

    J9 COMMON CODE

  • Reported component ID

    620700127

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-05-17

  • Closed date

    2013-05-17

  • Last modified date

    2013-06-10

  • 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

  • R260 PSY

       UP

  • R600 PSY

       UP

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Document Information

Modified date:
21 February 2022