PI85876: ABEND04E RC00E3000E DSNSVSFB +08A2 FOLLOWING AN ABEND13E PER LOGREC

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• An ABEND13E occurred for a connected user while the instruction
  at DSNVEUS1 +446 was being executed.  The ABEND13E caused the
  CCB control block to be freed, but DSNVEUS1 was in the middle of
  manipulating it.  This is a very rare timing window that has
  existed from the beginning when this code was written and its
  chance of occurring again are very rare.
  **************************************************************
  Additional Symptoms and Keywords:
   ABEND04E AB04E S004E 04E
    04E-00E2000E 00E2000E RC00E2000E
     DSN3AUCM.DSNSVSFB+08A2 DSN3AUCM DSNSVSFB
      +08A2 08A2 OFFSET08A2
   ABEND0C4 AB0C4 S00C4 0C4
    0C4-00000038 00000038 RC00000038
     DSNSLD4.DSNSVSFB+03D4 DSNSLD4 DSNSVSFB
      +03D4 03D4 OFFSET03D4
   Overlay overlaid SMCOVRLY DB2OVRLAY DB2OVRLAY/K
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All DB2 users.                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: Unpredictable symptoms including:       *
  *                       o ABEND04E RC00E2000E                  *
  *                         DSN3AUCM.DSNSVSFB+08A2               *
  *                       o ABEND0C4 DSNSLD4.DSNSVSFB+03D4       *
  *                       o DDF Abnormal termination as          *
  *                         indicated by message DSNL033I.       *
  *                      The symptoms occur due to an overlay    *
  *                      and DB2 must be recycled in order to    *
  *                      correct the condition.                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  In order to satisfy a user's SQL request, it was necessary
  for DB2 processing to spawn another (SRB related) thread.
  The user generated an abend 13E condition in order to
  interrupt the SQL processing, which is a common event,
  but happened to cause the abend 13E in DB2 while it was
  in a very small and sensitive window of the spawning process.
  The 13E abend interruption of the spawning process, during
  the short instruction window, ultimately leads to a one byte
  binary zero overlay of a "CCB" control block free chain.
  The nature of the one byte CCB free chain overlay leads
  to unpredictable symptoms. Known symptoms include:
   o Abend 04E-00E2000E DSN3AUCM.DSNSVSFB+08A2
   o Abend 0C4-00000038 DSNSLD4 .DSNSVSFB+03D4
   o DDF Abnormal termination as indicated by message DSNL033I.
  The overlay can impact all subsequent processing including
  local application work as well as work that originates from
  remote systems via DDF. The only solution for the overlay
  is to recycle DB2.
  

Problem conclusion

• DB2 spawning processing has been changed to eliminate the short
  instruction window such that a 13E abend can no longer cause
  a damaged CCB free chain.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UI50885 UI50886 PI92571

Modules/Macros

•    DSNVEUS1
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UI50885

     UP17/10/20 P F710 Ž

• RB10 PSY UI50886

     UP17/10/20 P F710 Ž

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.