IT26380: DEBUG CODE ADDED WITH IT22695 MAY CAUSE FALSE APPEND CACHE ERRORS

APAR status

• Closed as program error.

Error description

• There was debug code added as part of the fix for IT22695.
  This can cause false detection of errors in the append cache.
  
  Errors in db2diag.log file show similar to the following:
  2018-08-13-06.33.22.515595-240 I144726A3393 LEVEL: Severe
  PID : 6815792 TID : 38607 PROC : db2sysc 0
  INSTANCE: db2inst1 NODE : 000 DB : SAMPLE
  APPHDL : 0-242 APPID: 10.12.151.118.33033.180812174458
  AUTHID : DB2INST1 HOSTNAME: hostname
  EDUID : 38607 EDUNAME: db2agent (SAMPLE) 0
  FUNCTION: DB2 UDB, data management,
  sqldFindRidFromPageCacheComplex, probe:4623
  MESSAGE : Error searching page cache.
  DATA #1 : signed integer, 8 bytes
  0
  DATA #2 : unsigned integer, 8 bytes
  2
  DATA #3 : Hex integer, 8 bytes
  0x0000000000000004
  DATA #4 : unsigned integer, 8 bytes
  2
  DATA #5 : Page ID, PD_TYPE_SQLB_PAGE_ID, 4 bytes
  163998
  DATA #6 : Page ID, PD_TYPE_SQLB_PAGE_ID, 8 bytes
  0
  DATA #7 : Page ID, PD_TYPE_SQLB_PAGE_ID, 4 bytes
  163999
  DATA #8 : SQLD_PAGE_CACHE, PD_TYPE_SQLD_PAGE_CACHE, 96 bytes
  
  SQLD_PAGE_CACHE: Address:a000203ebb65ec0, Size:x60, Size:96
  x0000 pcFlags x4
  - SQLD_PGCACHE_TEMPAPPEND
  x0008 pcFirstObjPage 163998
  x000C pcFirstPoolPage 746302
  x0010 pcLocksPrefetchedPerPage 0
  x0018 pcNumPages 2
  x0028 pcLastPageWithSpace 0
  x0030 pcPgInfoHeader a000203f19a0060
  x0038 pcPgInfo a000203f19a0070
  x0040 pcMaxPages 2
  x0048 pcPgInfoToFree a000203f19b5ca0
  x0050 pcEduIDofLastXLatch 0
  x0058 pageCacheLatch a000203ebb65f80
  CALLSTCK: (Static functions may not be resolved correctly, as
  they are resolved to the nearest symbol)
  [0] 0x090000000DC2C2D4
  sqldSearchPageCache__FP13SQLD_DFM_WORKP15SQLD_PAGE_CACHEP16SQLD_
  TABLE_CACHET3 + 0x19BC
  [1] 0xFFFFFFFFFFFFFFFC ?unknown + 0xFFFFFFFF
  [2] 0x090000000DC20A18
  sqldSearchPageCache__FP13SQLD_DFM_WORKP15SQLD_PAGE_CACHEP16SQLD_
  TABLE_CACHET3 + 0x32D8
  [3] 0x090000000DC041D4 sqldInsertRow__FP13SQLD_DFM_WORKi + 0x1E0
  [4] 0x090000000DC05900
  sqldRowInsert__FP8sqeAgentUsT2UcUliPP10SQLD_VALUEP8SQLZ_RIDPPv +
  0x22C
  [5] 0x090000000DC0D4E8
  sqlrinsr__FP8sqlrr_cbUsT2iT2PP10SQLD_VALUEQ3_10sqlri_iudo11t_iud
  oFlags17t_iudoFlagsKernelP8SQLZ_RIDPPv + 0xBC
  [6] 0x090000000DC0D790 sqlriisr__FP8sqlrr_cb + 0x1CC
  [7] 0x090000000DDE849C
  sqlriSectInvoke__FP8sqlrr_cbP12sqlri_opparm + 0x94
  [8] 0x090000000DA95CA8
  sqljsParseRdbAccessed__FP13sqljsDrdaAsCbP13sqljDDMObjectP14db2UC
  interface + 0x1E98
  [9] 0x090000000DA95218
  sqljsParseRdbAccessed__FP13sqljsDrdaAsCbP13sqljDDMObjectP14db2UC
  interface + 0x1408
  [10] 0x090000000DA949A0
  sqljsParseRdbAccessed__FP13sqljsDrdaAsCbP13sqljDDMObjectP14db2UC
  interface + 0xB90
  [11] 0x090000000DA9A9F4
  @72@sqljsSqlam__FP14db2UCinterfaceP8sqeAgentb + 0x1168
  [12] 0x090000000DA9A9F4
  @72@sqljsSqlam__FP14db2UCinterfaceP8sqeAgentb + 0x1168
  [13] 0x090000000DA9A5E8
  @72@sqljsSqlam__FP14db2UCinterfaceP8sqeAgentb + 0xD5C
  [14] 0x090000000F5D9174
  @72@sqljsDriveRequests__FP8sqeAgentP14db2UCconHandle + 0xA8
  [15] 0x090000000F5D9C84
  @72@sqljsDrdaAsInnerDriver__FP18SQLCC_INITSTRUCT_Tb + 0x5F8
  [16] 0x090000000D284674 RunEDU__8sqeAgentFv + 0x4D060
  [17] 0x090000000D213DA0 RunEDU__8sqeAgentFv + 0x124
  [18] 0x090000000E42140C EDUDriver__9sqzEDUObjFv + 0x130
  [19] 0x090000000D1F5AF8 sqloEDUEntry + 0x390
  [20] 0x0900000000567E10 _pthread_body + 0xF0
  [21] 0xFFFFFFFFFFFFFFFC ?unknown + 0xFFFFFFFF
  
  2018-08-13-06.33.22.523263-240 I148120A570 LEVEL: Severe
  PID : 6815792 TID : 38607 PROC : db2sysc 0
  INSTANCE: db2inst1 NODE : 000 DB : SAMPLE
  APPHDL : 0-242 APPID: 10.12.151.118.33033.180812174458
  AUTHID : DB2INST1 HOSTNAME: hostname
  EDUID : 38607 EDUNAME: db2agent (SAMPLE) 0
  FUNCTION: DB2 UDB, trace services, sqlt_logerr_string (secondary
  logging function), probe:30
  MESSAGE : SQLD_TCB:
  DATA #1 : String, 42 bytes
  Perm Table(x:x)=SCHEMA.TABLE
  
  If the errors occur whilst an insert is being performed then the
  insert may hang.
  

Local fix

• Perform an offline reorg or set APPEND ON for the table which is
  having data inserted.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * ALL                                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Db2 11.1 Mod 4 Fixpack 4 or higher                *
  ****************************************************************
  

Problem conclusion

• First fixed in Db2 11.1 Mod 4 Fixpack 4
  

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:

  IT26383

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels

• RB10 PSN

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