IV19458: SEGMENTATION FAULT IN SYSTEM.ARRAYCOPY()

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: Segmentation fault in System.arraycopy() during
    stress testing when using -Xgcpolicy:metronome or
    -Xgcpolicy:balanced
    .
    Stack Trace: Unhandled exception
    Type=Segmentation error vmState=0x00000000
    J9Generic_Signal_Number=00000004 Signal_Number=0000000b
    Error_Value=00000000 Signal_Code=00000002
    Handler1=4042470A Handler2=404C6AB7 InaccessibleAddress=81070000
    EDI=00000001 ESI=00000800 EAX=8106FFE0 EBX=00002000
    ECX=00000000 EDX=00000004
    EIP=4103AA22 ES=007B DS=007B ESP=092D4B30
    EFlags=00010246 CS=0073 SS=007B EBP=094B6D00
    Module=/jtctest/sdk_installs/pxi3270/pxi3270-20110722_01/ibm-jav
    a-i386-70/jre/lib/i386/default/libjclse7b_26.so
    Module_base_address=41011000 Symbol=java_lang_System_arraycopy
    .
    

Local fix

  • If possible switch to the -Xgpolicy:gencon,
    -Xgcpolicy:optthruput or -Xgcpolicy:optavgpause.  Note that
    these GC polices do not provide the same pause time
    characteristics as -Xgcpolicy:metronome or -Xgcpolicy:balanced
    so this work around may cause application issues.
    

Problem summary

  • The Segmentation fault was due to a bad calculation if the
    source / destination array ended at the exact end of the heap
    which caused the code to read past the end of the heap memory.
    

Problem conclusion

  • This defect will be fixed in:
    7.0.0 SR1
    6.0.1 SR2
    WRT-V3 SR1
    .
    The JVM has been updated to handle this case so that it does not
    read past the end of the heap memory
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV19458

  • 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

    2012-04-10

  • Closed date

    2012-05-19

  • Last modified date

    2012-05-19

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    IV21492

Fix information

  • Fixed component name

    J9 COMMON CODE

  • Fixed component ID

    620700127

Applicable component levels

  • R260 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Virtual Machine

Software version:

260

Reference #:

IV19458

Modified date:

2012-05-19

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