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IV70167: DEBUG KERNEL TRAP IN V_RELALIAS_BLOCK+000498 APPLIES TO AIX 7100-03

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Using a DEBUG kernel on a P8 system may hit an incorrect assert
    when trying to use mprotect() to remove all access to a
    privately mmap'ed object that still has translations to the
    source object.
    
    The stack trace back will have v_relalias_block.
    Here is one example trace back:
    
    KDB(0)> f
    pvthread+013F00 STACK:
    ■00023980abend_trap+000000 ()
    ■0026FE98v_relalias_block+000498 (??, ??, ??, ??, ??)
    ■002735E4v_relalias+000704 (??, ??, ??, ??, ??)
    ■00400DD4v_protectap+0007F4 (??, ??, ??, ??, ??, ??)
    ■004D3E78v_preprotectap+000238 (??, ??, ??, ??, ??, ??)
    ■0002F3E0begfst+000190 ()
    

Local fix

Problem summary

  • Using a DEBUG kernel on a P8 system may hit an incorrect assert
    when trying to use mprotect() to remove all access to a
    privately mmap'ed object that still has translations to the
    source object.
    
    The stack trace back will have v_relalias_block.
    Here is one example trace back:
    
    KDB(0)> f
    pvthread+013F00 STACK:
     00023980 abend_trap+000000 ()
     0026FE98 v_relalias_block+000498 (??, ??, ??, ??, ??)
     002735E4 v_relalias+000704 (??, ??, ??, ??, ??)
     00400DD4 v_protectap+0007F4 (??, ??, ??, ??, ??, ??)
     004D3E78 v_preprotectap+000238 (??, ??, ??, ??, ??, ??)
     0002F3E0 begfst+000190 ()
    

Problem conclusion

  • Fix the DEBUG assert.
    

Temporary fix

Comments

  • 6100-09 - use AIX APAR IV70175
    7100-03 - use AIX APAR IV70167
    

APAR Information

  • APAR number

    IV70167

  • Reported component name

    AIX V7.1

  • Reported component ID

    5765H4000

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2015-02-27

  • Closed date

    2015-02-27

  • Last modified date

    2015-05-22

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

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

    IV70175 IV70183

Fix information

  • Fixed component name

    AIX V7.1

  • Fixed component ID

    5765H4000

Applicable component levels

  • R710 PSY U865837

       UP15/05/19 I 1000

PTF to Fileset Mapping



Document information

More support for: AIX Enterprise Edition

Software version: 710

Operating system(s): AIX

Reference #: IV70167

Modified date: 22 May 2015