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IT37932: EXCEPTION DURING QUERY OF SYSSQLSTAT TABLE MAY LEAD TO SESSION HANG

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APAR status

  • Closed as program error.

Error description

  • If an exception is raised during the processing of a query
    relating to the sysmaster table syssqlstat the clean up
    operation may result in a further exception resulting in a loop
    of the sqlexec thread. At the same time other threads may become
    blocked waiting on the session mutex.
    
    As the problem thread is in a running state the stack obtained
    via onstat may be unreliable. Use the onmode -X stack command or
    an OS command such as pstack to obtain a stack:
    
    sigprocmask()
    mt_sighold()
    mt_ex_throw_sig()
    mt_ex_end_keep_var()
    prsqlstat()
    pstread()
    rsread()
    fmread()
    readseq_single()
    gettupl()
    scan_next()
    next_row.part()
    get_first_row_from_producer()
    group_open()
    prepselect()
    open_cursor()
    sq_open()
    sqmain()
    spawn_thread()
    th_init_initgls()
    startup()
    
    This problem is first seen in versions where IT35916 is fixed.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users of Informix Server prior to 12.10.xC15 and 14.10.xC7.  *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Informix Server 12.10.xC15 or 14.10.xC7.          *
    ****************************************************************
    

Problem conclusion

  • Fixed in Informix Server 12.10.xC15 and 14.10.xC7.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT37932

  • Reported component name

    INFORMIX SERVER

  • Reported component ID

    5725A3900

  • Reported release

    E10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2021-08-09

  • Closed date

    2021-11-02

  • Last modified date

    2021-11-02

  • 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

[{"Line of Business":{"code":"LOB10","label":"Data and AI"},"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SSGU8G","label":"Informix Servers"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"E10"}]

Document Information

Modified date:
03 November 2021