IBM Support

IT00802: ASSERTION FAILURE CRASH IN MT_PRTCBLST POSSIBLY WHEN RUNNING SYSMASTER QUERY AGAINST SYSTCBLST

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APAR status

  • Closed as program error.

Error description

  • When a user is querying sysmaster:systcblst, it is possible that
    the thread may generate an assertion failure which brings the
    server down if the tcb it's looking at is freed and reused.
    
    The stack for the crash looks as follows:
    
    afstack
    mt_ex_throw_sig
    afsig_handler
    <signal frame>
    mt_prtcblst
    pstread
    pst_rsread
    rsread
    fmread
    readseq_single
    gettupl
    scan_next
    next_row
    hash_process_all_groups
    group_open
    prepselect
    open_cursor
    sql_open
    sq_open
    sqmain
    spawn_thread
    startup
    
    It's also possible the stack may include nxttcb() which would be
    between mt_prtcblst and the signal frame, as that is the
    function where the code is actually having problems, but this
    function can be in-lined on some platforms which makes it
    non-visible on the stack.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users doing queries on systcblst.                            *
    ****************************************************************
    * 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

    IT00802

  • 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

    2014-04-03

  • 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

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Document Information

Modified date:
09 June 2017