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IZ91017: BLOCKING LOCK REQUESTS GET BLOCKED FOR 60SEC WITH ENOUGH LOAD APPLIES TO AIX 5300-10

A fix is available

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APAR status

  • Closed as program error.

Error description

  • When several blocking lock requests are made from the
    same
    process and the same client in parallel (such as in a
    multi-
    threaded process environment), depending on the timing,
    it
    is possible that some lock requests receive a
    "NLM4_BLOCKED"
    response (even though the lock could have been granted)
    and
    have to wait for up to 60 sec before a retry is
    attempted.
    

Local fix

  • None. The lock requests will be retried after 60 sec
    automatically
    by the client side code.
    

Problem summary

  • From an NFS client, when several blocking file lock requests
    are made from the same process and the same client in parallel
    (such as in a multi-threaded process environment), depending
    on the timing, it is possible that some lock requests receive
    a "NLM4_BLOCKED" response (even though the lock could have
    been granted) and have to wait for up to 60 sec before a
    retry is attempted.
    

Problem conclusion

  • Modified NFS server code to properly handle the blocking file
    lock requests.
    

Temporary fix

Comments

  • 5300-10 - use AIX APAR IZ91017
    5300-11 - use AIX APAR IZ91093
    5300-12 - use AIX APAR IZ91096
    6100-03 - use AIX APAR IZ93967
    6100-04 - use AIX APAR IZ93968
    6100-05 - use AIX APAR IZ93361
    6100-06 - use AIX APAR IZ93081
    6100-06 - use AIX APAR IZ86900
    7100-00 - use AIX APAR IZ87075
    

APAR Information

  • APAR number

    IZ91017

  • Reported component name

    AIX 5.3

  • Reported component ID

    5765G0300

  • Reported release

    530

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2010-12-15

  • Closed date

    2010-12-15

  • Last modified date

    2013-04-17

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

    IZ70698

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

Fix information

  • Fixed component name

    AIX 5.3

  • Fixed component ID

    5765G0300

Applicable component levels

  • R530 PSY U840532

       UP11/02/23 I 1000

PTF to Fileset Mapping

[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11P","label":"APARs - AIX 5.3 environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"530","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
17 April 2013