IBM Support

IT01128: PDQ QUERY HANGS ON MUTEX FREE_LOCK

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APAR status

  • Closed as program error.

Error description

  • Using IDS 11.70 a query running with PDQ enabled may appear to
    hang. The output of the "onstat -g ses <sid>" command will show
    a number of threads in a state of waiting for the mutex
    free_lock. In addition one thread will show in a running state.
    
    For example:
    
    4405339  sqlexec  7000007afff4a68  S--P---  7584     mutex wait
    free_lock -
    4624280  scan_136 700000859af29e0  -------  2000     running-
    4624281  scan_136 7000007d951ce28  S------  2128     mutex wait
    free_lock -
    4624282  scan_136 7000007ae7b72f8  S------  2128     mutex wait
    free_lock -
    4624283  scan_136 7000007b5c5e448  S------  2128     mutex wait
    free_lock -
    
    The output of the command "onstat -g lmx" will indicate threads
    waiting on the free_lock mutex as shown below:
    
    Locked mutexes:
    mid      addr             name               holder   lkcnt
    waiter   waittime
    105221   7000007a8c74358  free_lock          4624280  0
    4405339  30693
    
    4624282  30693
    
    4624281  30693
    
    4624283  30692
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users running parallel data queries                          *
    ****************************************************************
    * 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

    IT01128

  • 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

    2014-04-17

  • 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

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSGU8G","label":"Informix Servers"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"B70","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
09 June 2017