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PM48938: OUT OF ORDER VIEW XIDS FROM MVFS RPC CALLS CAUSE VIEW_SERVER TO DROP VALID RPC PACKETS FROM CLIENT

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APAR status

  • Closed as program error.

Error description

  • Out of order view xids from MVFS RPC calls cause view_server to
    drop valid RPC packets from client
    
    
    ClearCase 7.1.1.1
    
    
    RedHat  5 Update 5
    
    
    Description of the problem:
    
    While building within MVFS and under heavy load on the client
    system, the following system messages may start to appear and
    coincide with a significant performance decrease for the
    affected view only:
    
       kernel: RPC call_verify: retry failed, exit EIO
       kernel: call_verify: server accept status: 5
       last message repeated 2 times
    
    RPC packet payload examination of a network trace at the time of
    the event showed the following successful ordered xids with an
    out of order xid that was summarily dropped by the view_server
    causing a retransmit of the RPC:
    
    view_server internal xid:
    
       43407A08
       43407A1D
       43407A7A
       43407AF7
       43407AFD
       43407B1C
       4327F073   ?---  RPC error status 5 returned from view_server
    
    
    Workaround:  none
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Under certain unusual conditions, an RPC timeout error would
    be handled in such a way that the normal retry of the
    operation would be misinterpreted as a stale transaction,
    causing valid RPC packets to be dropped by the view_server.
    

Problem conclusion

  • A fix is available in ClearCase 7.1.2.9 and 8.0.0.5.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM48938

  • Reported component name

    CLRCASE MSITE U

  • Reported component ID

    5724G3201

  • Reported release

    701

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-09-28

  • Closed date

    2012-12-15

  • Last modified date

    2012-12-15

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

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

Fix information

  • Fixed component name

    CLRCASE MSITE U

  • Fixed component ID

    5724G3201

Applicable component levels

  • R701 PSN

       UP

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Document Information

Modified date:
15 December 2012