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IV66750: DMS timeout during amepat crit sect on only available cpu APPLIES TO AIX 7100-03

A fix is available

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • DMS timeout might occur when amepat is running on the
    only available
    CPU on the system.
    
    All the other CPUs are folded and amepat has monopolized
    the
    only online CPU in the system
    
    Stack trace will be something like
    
    pvthread+0F2200 STACK:
    [0005F480]begfst+000200 ()
    [0005F47C]begfst+0001FC ()
    [001327E0]vm_cmem_get_ref_stats+000100 (??)
    [006EBFA0]_vmgetinfo+001100 (??, ??, ??, ??)
    [006F46A8]vmgetinfo+000048 (??, ??, ??)
    [00003888]mfspurr_sc_flih01+0000E4 ()
    [kdb_get_virtual_memory] no real storage @ 2FF224B8
    

Local fix

  • To circumvent this issue, make sure that there is always
    an extra
    CPU available. This can be achieved by the following
    command
    
    schedo -p -o vpm_xvcpus=2
    
    NOTE: this still might not protect from a situation where
    HATDS
    or similar process is bound to this particular CPU where
    'amepat' command is running
    

Problem summary

  • A heartbeat or other realtime process will incorrectly signal
    a failure.
    

Problem conclusion

  • Insert a manual scheduler check during statistics processing.
    

Temporary fix

Comments

  • 6100-09 - use AIX APAR IV66512
    7100-03 - use AIX APAR IV66750
    

APAR Information

  • APAR number

    IV66750

  • Reported component name

    AIX V7.1

  • Reported component ID

    5765H4000

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2014-11-10

  • Closed date

    2014-11-10

  • Last modified date

    2015-05-22

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

    IV66512

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

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 #: IV66750

Modified date: 22 May 2015