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IV71256: SAP UUID_CREATE() STALLS DUE TO NDD_LOCK SERIALIZATION 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

  • Applications that query network statistics currently must
    wait until any other query is completed. Some network
    devices such as san storage (npiv) can wait many seconds
    for a target devices to respond and the query to
    complete.
    
    This can result in functions such as uuid_create() which
    indirectly query network to pause many seconds. This has
    negative consequences for applications such SAP.
    

Local fix

  • If a call to netstat -v stalls before completion then
    there is exposure to this problem.
    
    Remove all unusued/unconfigured npiv devices from the
    client lpar. Confirm netstat -v does not stall before
    completion.
    

Problem summary

  • uuid_create() may hang for over 2 minutes whenever there is
    a non responsive npiv adapter(Ex fcs switch is messed up)
    and they call uuid_create()
    

Problem conclusion

  • Ndd lock serialization is fixed.
    

Temporary fix

Comments

  • 6100-09 - use AIX APAR IV71257
    7100-03 - use AIX APAR IV71256
    

APAR Information

  • APAR number

    IV71256

  • Reported component name

    AIX V7.1

  • Reported component ID

    5765H4000

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2015-03-20

  • Closed date

    2015-03-20

  • Last modified date

    2016-05-11

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

    IV70679

  • 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 #: IV71256

Modified date: 11 May 2016