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IV67654: LINUX CORE DUMP MISSING HEAP MEMORY WHEN USING HUGE PAGES

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Error Message: A core dump triggered on Linux via the operating
    system (not via the JVM dump agents) was smaller than expected.
    When opened with a tool such as jdmpview or Memory Analyser the
    core dump did not contain the memory for the Java heap.
    .
    Stack Trace: N/A
    .
    This issue only affects core dumps created by unhandled signals
    that cause a core dump to be generated by the operating
    system.If the JVM generates a core dump itself via the JVM dump
    agents and reports:"JVMDUMP032I JVM requested System dump ..."on
    the console it will have ensured the large pages are in the core
    dump.
    

Local fix

  • Writing the string "0x7F" to the coredump_filter for a process
    will force Linux to include all the pages of memory in any core
    dump generated by the operating system for that process.The
    coredump_filter can be set for a running JVM by identifying the
    process id (pid) of the JVM and running:> echo 0x7F >
    /proc/<pid>/coredump_filterThe setting for a running process can
    be checked by running:> cat /proc/<pid>/coredump_filter
    

Problem summary

  • The problem was caused by the JVM resetting the value of
    coredump_filter incorrectly.
    

Problem conclusion

  • The JVM has been updated to set coredump_filter to 0x7F at
    startup.
    .
    This APAR will be fixed in the following Java Releases:
       7 R1 SR2 FP10  (7.1.2.10)
       6    SR16 FP3  (6.0.16.3)
       6 R1 SR8 FP3   (6.1.8.3)
       7    SR8 FP10  (7.0.8.10)
    .
    Contact your IBM Product's Service Team for these Service
    Refreshes and Fix Packs.
    For those running stand-alone, information about the Service
    Refreshes and Fix Packs can be found at:
               https://www.ibm.com/developerworks/java/jdk/
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV67654

  • Reported component name

    J9 COMMON CODE

  • Reported component ID

    620700127

  • Reported release

    270

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-12-08

  • Closed date

    2014-12-08

  • Last modified date

    2014-12-08

  • 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

  • R270 PSY

       UP

  • R600 PSY

       UP

  • R260 PSY

       UP

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Document Information

Modified date:
21 February 2022