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IC66970: DB2 PAGE CLEANER HANGS MAY LEAD TO DATABASE HANGING

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Page cleaners spinning on V97FP1
    
    The stack of the page cleaners will show that they keep on
    looping within the sqlbClnrGatherForFlushUpToLSN function
    
    Stack:
    <StackTrace>
    -------Frame------ ------Function + Offset------
    0x090000001A7F3214 sqloSpinLockReleaseConflict + 0xB8
    0x090000001A7F3360 sqloSpinLockReleaseConflict@glue74 + 0x78
    0x090000001A969740
    sqlbClnrGatherForFlushUpToLSN__FP12SQLB_CLNR_CB + 0x1D0
    0x090000001A557024 sqlbClnrGatherPages__FP12SQLB_CLNR_CB + 0x0
    0x090000001A5C2B60 sqlbClnrEntryPoint__FP12sqbPgClnrEdu + 0x714
    0x090000001A7BEED4 RunEDU__12sqbPgClnrEduFv + 0x34
    0x090000001A7BF184 EDUDriver__9sqzEDUObjFv + 0xDC
    0x090000001A7B3AE0 sqloEDUEntry + 0x264
    </StackTrace>
    
    A trace of the page cleaners will show that the cleaners keep on
    entering and exiting this function with rc = TRIGGER_SERVICED.
    

Local fix

  • Recycle the instance
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * An internal trigger was not turned off properly for the page *
    * cleaners, causing them to spin on finding work, when there   *
    * isn't any.                                                   *
    *                                                              *
    *                                                              *
    * The stack of the page cleaners will show that they keep on   *
    *                                                              *
    * looping within the sqlbClnrGatherForFlushUpToLSN function    *
    *                                                              *
    *                                                              *
    *                                                              *
    * Stack:                                                       *
    *                                                              *
    * <StackTrace>                                                 *
    *                                                              *
    * -------Frame------ ------Function + Offset------             *
    *                                                              *
    * 0x090000001A7F3214 sqloSpinLockReleaseConflict + 0xB8        *
    *                                                              *
    * 0x090000001A7F3360 sqloSpinLockReleaseConflict@glue74 + 0x78 *
    *                                                              *
    * 0x090000001A969740                                           *
    *                                                              *
    * sqlbClnrGatherForFlushUpToLSN__FP12SQLB_CLNR_CB + 0x1D0      *
    *                                                              *
    * 0x090000001A557024 sqlbClnrGatherPages__FP12SQLB_CLNR_CB +   *
    * 0x0                                                          *
    * 0x090000001A5C2B60 sqlbClnrEntryPoint__FP12sqbPgClnrEdu +    *
    * 0x714                                                        *
    * 0x090000001A7BEED4 RunEDU__12sqbPgClnrEduFv + 0x34           *
    *                                                              *
    * 0x090000001A7BF184 EDUDriver__9sqzEDUObjFv + 0xDC            *
    *                                                              *
    * 0x090000001A7B3AE0 sqloEDUEntry + 0x264                      *
    *                                                              *
    * </StackTrace>                                                *
    *                                                              *
    *                                                              *
    *                                                              *
    * A trace of the page cleaners will show that the cleaners     *
    * keep on                                                      *
    * entering and exiting this function with rc =                 *
    * TRIGGER_SERVICED.                                            *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * It is a rare problem to hit, but the customer's only option  *
    * is to recycle the instance.                                  *
    ****************************************************************
    

Problem conclusion

  • the problem is fixed in v97 fp 2
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC66970

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    970

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-03-08

  • Closed date

    2010-05-13

  • Last modified date

    2010-05-13

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    IC66974

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • R970 PSN

       UP

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSEPGG","label":"DB2 for Linux, UNIX and Windows"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.7","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
13 May 2010