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IC75181: DB2DART MAY PRODUCE A HEX DUMP THAT IS LARGER THAN THE PAGESIZE,IF BEGOFF VALUE IN PAGE HEADER IS CORRUPTED

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • If a page header is corrupted,  db2dart may create a hex dump of
    the page that is larger than the page.   This will occur when
    the value in begoff is larger than pagesize.
    
    For example, consider this page header
    
               000       *A41D 1C91 7B1B 9CD7 5A01 EF73 DBE5 FD52*
    *........Z..s...R*
               010       *A719 B407 3A9B B6FC 9C97 34CD B129 2EE6*
    *..........4.....*
               020       *9FF0 97AB BDFB 0149 E65A C8DA BC0B 226B*
    *.......I.Z.....k*
    
    The hexdump of the page is 0xA41D bytes long, exactly the size
    of begoff.    In this case, the pagesize is 8K, so anything
    printed after 0x2000 is bogus.
    
    When searching for patterns in the hex dump to help the customer
    identify root cause of the page overwrite,   any patterns found
    after the pagesize will become a 'false positive' and can
    mislead the investigation
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Problem Description above                                *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 Version 9.7 Fix Pack 5                        *
    ****************************************************************
    

Problem conclusion

  • First fixed in DB2 Version 9.7 Fix Pack 5
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC75181

  • 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

    2011-03-22

  • Closed date

    2011-12-08

  • Last modified date

    2011-12-08

  • 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

    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 #: IC75181

Modified date: 08 December 2011