IBM Support

IT00678: POTENTIAL FOR HANG ON BLD REF CONSTRAINT MUTEX OR MODIFICATION OF MEMORY UNRELATED TO DICTIONARY CACHE

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APAR status

  • Closed as program error.

Error description

  • Access to each list of entries in the data dictionary cache is
    regulated by a number of mutexes named "bld ref constraint." In
    some circumstances there may be a problem in gaining access to
    the mutex which goes unnoticed. If this occurs the potential
    exists to unlock a bld ref constraint mutex that should not be
    unlocked or to modify unrelated memory.
    
    In the former case another thread may subsequently be blocked
    waiting for the mutex to become available when it in reality it
    has no owner. This may be seen in the output of the "onstat -g
    lmx" or "onstat -g wmx" commands where threads will be seen
    waiting on a mutex that has a lkcnt value of -1.
    
    This problem can only occur in versions that include the fix for
    IC95989 which was first fixed in versions 11.70.xC7W3 and
    12.10.xC3.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Those using foreign key constraints in extremely busy        *
    * systems.                                                     *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    * For versions not containing a fix to IC95989, this issue     *
    * would manifest as an abend rather than a hang.               *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Update to IDS-11.70.xC9                                      *
    ****************************************************************
    

Problem conclusion

  • Problem Fixed In IDS-11.70.xC9
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT00678

  • Reported component name

    INFORMIX SERVER

  • Reported component ID

    5725A3900

  • Reported release

    B70

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2014-03-28

  • Closed date

    2017-06-09

  • Last modified date

    2017-06-09

  • 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

    INFORMIX SERVER

  • Fixed component ID

    5725A3900

Applicable component levels

  • RB70 PSN

       UP

  • RB70 PSY

       UP

  • RC10 PSN

       UP

  • RC10 PSY

       UP

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Document Information

Modified date:
09 June 2017