IBM Support

IT34190: DB2EGCF MAY CAUSE TRACE FLOODING DUE TO MEMORY SEG FAULT

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APAR status

  • Closed as program error.

Error description

  • In a Db2 HA environment, when db2egcf with option "-h" is
    called, a segmentation fault may be induced in the memory
    causing trace flooding. The following message will be observed
    in db2diag.log on the node.
    
    2020-06-13-01.41.31.336279-240 I23415402E954         LEVEL:
    Error
    
    PID     : 19228                TID : 47838778077568  PROC :
    db2egcf
    
    INSTANCE: db2inst1              NODE : 000
    
    HOSTNAME: db2hostname1
    
    FUNCTION: <0>, <0>, <0>, probe:100
    
    MESSAGE : ZRC=0x850F00C4=-2062614332=SQLO_ADDR_CONFLICT
    
              "An address space conflict was detected attaching to
    shared memory."
    
    DATA #1 : String, 22 bytes
    
    sqlocshr.-2062614332..
    
    CALLSTCK: (Static functions may not be resolved correctly, as
    they are resolved to the nearest symbol)
    
      [0] 0x00002B82644CF84B
    /opt/ibm/db2/V10.5/V11.1/lib64/libdb2osse.so.1 + 0x23F84B
    
      [1] 0x00002B82644CF681 ossLog + 0xA1
    
      [2] 0x0000000000403779
    _Z21db2haAttachToDatabasePcP9SQLE_KRCBPP16sqeLocalDatabase +
    0x249
    
      [3] 0x0000000000403401 _Z17db2haGetHADRStatePcS_ + 0x1D1
    
      [4] 0x0000000000402EE9 main + 0x8E9
    
      [5] 0x00002B826529C495 __libc_start_main + 0xF5
    
      [6] 0x0000000000402539 /usr/local/db2inst1/sqllib/bin/db2egcf
    +
    0x2539
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All Users                                                    *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Db2 version 11.1 Mod 4 FP 6                       *
    ****************************************************************
    

Problem conclusion

  • Issue found in Db2  versions prior to 11.1 Mod 4 FP 6
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT34190

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    B10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-09-11

  • Closed date

    2021-04-30

  • Last modified date

    2021-04-30

  • 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

[{"Line of Business":{"code":"LOB10","label":"Data and AI"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1"}]

Document Information

Modified date:
01 May 2021