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

Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows

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 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

• RB10 PSN

     UP