IT31866: FODC_TRAP IN MEMCOPY IS POSSIBLE WHEN EXECUTING A COMPLEX QUERY WITH RID FUNCTION WHEN INTERNAL OPTIMIZATIONS ARE DONE

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

• Instance could go down with a NULL pointer access during
  execution of the query in a very rare specific case, when
  internal optimization is done.
  Stacks could vary, but most likely
  - RID function is used in the query
  - Plan has a TEMP or a SORT and there are operations above it.
  - Stack will have sqldEvalDataPred executing sqlri* function
  
  Support needs to be contacted and dumps must be provided for
  examination
  to be sure that this issue is hit.
  
  One of possible stacks:
  
  memcpy
  sqlri_max_Complete_Bigint
  sqlriaggNoGroup2
  sqldEvalDataPred
  sqlsfetc
  sqlriNljnPiped
  sqlriSectInvoke
  sqlrr_subagent_router
  ...
  

Local fix

• db2stop
  db2set DB2_TCG_DEFAULT_OPTIONS="set disable_pushdown on"
  db2start
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * RID function and SORT                                        *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * See Error Description                                        *
  ****************************************************************
  

Problem conclusion

• See Error Description
  

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 PSY

     UP