IBM Support

IC79533: DB2 AGENT HANG IN SQLPGWAITFORLRECONDISK DUE TO MISSING POST.

Subscribe

You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • In rare conditions, a db2agent may be stuck in following call
    stacks due to missing post during writing log records into disk.
    
      sqlpgWaitForLrecOnDisk + 0x330
      sqlpWriteToLog + 0x7D8
      sqlpWriteLR + 0x418
    
    The above stacks should be observed in a stack file(use db2pd
    -stack all to generate stack files) for several rounds for a
    long time.
    
    If this db2agent had obtained some latches, then there is a
    chance to hang database due to latch wait cascaded.
    

Local fix

  • No known work around.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All.                                                         *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * In rare conditions, a db2agent may be stuck in following     *
    * call stacks due to missing post during writing log records   *
    * into disk.                                                   *
    *                                                              *
    *   sqlpgWaitForLrecOnDisk + 0x330                             *
    *   sqlpWriteToLog + 0x7D8                                     *
    *   sqlpWriteLR + 0x418                                        *
    *                                                              *
    * The above stacks should be observed in a stack file(use      *
    * db2pd -stack all to generate stack files) for several rounds *
    * for a long time.                                             *
    *                                                              *
    * BTW, if this db2agent had obtained some latches, then there  *
    * is a chance to hang database due to latch wait cascaded.     *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Update to version 9.7 fixpack 3 or later fixpacks.           *
    ****************************************************************
    

Problem conclusion

  • This problem is first fixed in version 9.7 fixpack 3.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC79533

  • 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

    2011-10-31

  • Closed date

    2011-11-03

  • Last modified date

    2012-04-04

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

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

    IC82267

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • R970 PSN

       UP



Document information

More support for: DB2 for Linux, UNIX and Windows

Software version: 9.7

Reference #: IC79533

Modified date: 04 April 2012