3737552 - DB6: Database down due to "latch likely corrupted" error

• Database goes down intermittently with FODC panic directory generated.
  
  
• db2diag.log file returns following error:
  
  

  2026-04-05-16.13.21.529364+330 E15500317873A2155    LEVEL: Severe (OS)
  PID     : 66666666             TID : 888888         PROC : db2sysc 0
  INSTANCE: db2abc               NODE : 000           DB   : abc
  APPHDL  : 0-3018               APPID: XXX
  AUTHID  : SAPabc               HOSTNAME: abc
  EDUID   : 888888               EDUNAME: db2agnts (abc) 0
  FUNCTION: DB2 UDB, SQO Latch Tracing, SQLO_SLATCH_CAS64::releaseConflict, probe:300
  MESSAGE : ZRC=0x870F0114=-2029059820=SQLO_LATCH_ERROR_UNUSED_BITS_ARE_SET
            "latch likely corrupted.  Reserved bits are unexpectedly non-zero."
  CALLED  : OS, -, unspecified_system_function
  DATA #1 : String, 39 bytes
  Attempting to unlock an invalid latch: 
  DATA #2 : File name, 16 bytes
  sqloLatchCAS64.C

  2026-04-05-16.20.37.080176+330 E15500909302A599     LEVEL: Severe
  PID     : 66666666             TID : 258            PROC : db2wdog 0 [db2abc]
  INSTANCE: db2abc               NODE : 000
  HOSTNAME: abc
  EDUID   : 258                  EDUNAME: db2wdog 0 [db2abc]
  FUNCTION: DB2 UDB, base sys utilities, sqleWatchDog, probe:20
  MESSAGE : ADM0503C  An unexpected internal processing error has occurred. All 
            database manager processes associated with this instance have been 
            shutdown. Diagnostic information has been recorded. Contact IBM 
            Support for further assistance.
  
  2026-04-05-16.13.21.535972+330 E15500320029A962     LEVEL: Critical
  PID     : 88888888             TID : 888888        PROC : db2sysc 0
  INSTANCE: db2abc               NODE : 000           DB   : abc
  APPHDL  : 0-3018               APPID: XXXXX
  AUTHID  : SAPabc               HOSTNAME: abc
  EDUID   : 888888              EDUNAME: db2agnts (abc) 0
  FUNCTION: DB2 UDB, base sys utilities, sqle_panic, probe:10
  MESSAGE : ADM14001C  An unexpected and critical error has occurred: "Panic". 
            The instance may have been shutdown as a result. "Automatic" FODC 
            (First Occurrence Data Capture) has been invoked and diagnostic 
            information has been recorded in directory 
            "/db2/abc/db2dump/FODC_Panic_2026-04-05-16.13.21.530578_0000/". 
            Please look in this directory for detailed evidence about what 
            happened and contact IBM support if necessary to diagnose the 
            problem.

• SAP on IBM Db2 for Linux, Unix and Windows
• Db2 version Db2 v11.1 Mod4 Fixpack4

db2 panic, adm14001c, adm0503c, fodc_panic, sqlo_slatch_cas64, latch corrupted, package cache, stmm, sql0003n, dia8532c, db2 11.1.2.2, aix, power10, instance shutdown, upgrade fix pack , KBA , BC-DB-DB6 , DB2 Universal Database for Unix / NT , Problem