IBM Support

IC98400: REPLICATED LVARCHAR COLUMNS WITH DIFFERENT SOURCE/TARGET LENGTHSCAN LEAD TO MEMORY CORRUPTION

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APAR status

  • Closed as program error.

Error description

  • Enterprise Replication allows the creation of a replicate on a
    table containing an lvarchar column and the addition of
    participants to be added when the target's column length is
    shorter than the table from which the master replicate was
    created. This can lead to memory corruption because column
    lengths are not being checked on lvarchar columns by the target
    server.
    
    Since this is memory corruption due to out of bounds memory
    writes, the results may vary. Here are a couple stacks seen:
    
    afstack
    afhandler
    afwarn_interface
    mt_shm_malloc_segid
    mt_malloc
    cdr_mt_shm_malloc
    cdr_mt_shm_realloc
    dsiGetLocalRow
    dsiCheckCollision
    dsiProcessRow
    dsiResolverThread
    cdrTrampolineThread
    th_init_initgls
    startup
    
    afstack
    afhandler
    affail_interface
    mt_shm_malloc_segid
    mt_malloc
    cdr_mt_shm_malloc
    rmStreamOpen
    rmiCreateDSPreLocks
    rmiGetNextPendingTxn
    rmNextMsg
    dsiResolverThread
    cdrTrampolineThread
    th_init_initgls
    startup
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * any customer using LVARCHARS and ER                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Update to IDS-11.70.xC9                                      *
    ****************************************************************
    

Problem conclusion

  • Problem Fixed In IDS-11.70.xC9
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC98400

  • 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

    2013-12-18

  • 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

  • RA10 PSN

       UP

  • RA10 PSY

       UP

  • RB10 PSN

       UP

  • RB10 PSY

       UP

  • RB50 PSN

       UP

  • RB50 PSY

       UP

  • RB70 PSN

       UP

  • RB70 PSY

       UP

  • RC10 PSN

       UP

  • RC10 PSY

       UP



Document information

More support for: Informix Servers

Software version: B70

Reference #: IC98400

Modified date: 09 June 2017


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