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IC99807: Crash in db2top collector mode when compressing the snapshot data

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APAR status

  • Closed as program error.

Error description

  • db2top running in collector mode ( e.g. db2top -d <dbname> -C
    ... ) may trap when compressing the snapshot stream, with
    following stacktrace:
    
    </Siginfo_t>
    Signal #11 (SIGSEGV): si_addr is 0x00002B3E4999F000, si_code is
    0x00000001 (SEGV_MAPERR:Address not mapped to object.)
    </SignalDetails>
    .....
    <POFDisassembly>
     rle_output + 0x0020    (db2top)
    
            0x000000000042413E : 408832B801000000
    </POFDisassembly>
    <StackTrace>
    -----FUNC-ADDR---- ------FUNCTION + OFFSET------
    0x00002B3E42FB5E2F ossDumpStackTraceEx + 0x01ef
                    (/home/db2inst1/sqllib/lib64/libdb2osse.so.1)
    0x00002B3E42FB0BEE _ZN11OSSTrapFile6dumpExEmiP7siginfoPvm +
    0x00cc
                    (/home/db2inst1/sqllib/lib64/libdb2osse.so.1)
    0x00002B3E41EA6B0F sqlo_trce + 0x03fb
                    (/home/db2inst1/sqllib/lib64/libdb2.so.1)
    0x000000000044FAA0 _Z17pdToolTrapHandleriP7siginfoPv + 0x00e8
                    (db2top)
    0x00000030CF430280 address: 0x00000030CF430280 ; dladdress:
    0x00000030CF400000 ; offset in lib: 0x0000000000030280 ;
                    (/lib64/libc.so.6)
    0x000000000042413E rle_output + 0x0020
                    (db2top)
    0x00000000004240C6 do_compress + 0x006a
                    (db2top)
    0x0000000000457A19 write_snapshotstream + 0x0035
                    (db2top)
    0x000000000045730F write_stream + 0x01d9
                    (db2top)
    0x0000000000428D54 _GetSnapshot + 0x050a
                    (db2top)
    0x0000000000428799 _run_snapshot + 0x04e1
                    (db2top)
    0x0000000000456F7A save_background_stream + 0x02e6
                    (db2top)
    0x00000000004434BD main + 0x00d9
                    (db2top)
    0x00000030CF41D974 __libc_start_main + 0x00f4
                    (/lib64/libc.so.6)
    0x0000000000418899 __gxx_personality_v0 + 0x0229
                    (db2top)
    </StackTrace>
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All DB2 db2top users                                         *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 LUW 10.5 Fix Pack 4                           *
    ****************************************************************
    

Problem conclusion

  • First fixed in DB2 LUW 10.5 Fix Pack 4
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC99807

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    A50

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-03-04

  • Closed date

    2014-09-15

  • Last modified date

    2014-09-15

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

    IC98066

  • 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

  • RA50 PSN

       UP

  • RA50 PSY

       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":"10.5","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
15 September 2014