PI73291: ABEND0C4 RC38 AT DSNSCON2 + X'172C' AND OTHER ABENDS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ABEND0C4 RC38 at DSNSCON2 + x'172C' and other abends due to same
  storage block allocated to different threads after a thread
  abends during contraction of a  64-bit pool.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All DB2 12 for z/OS users                                    *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * ABEND0C4 RC38 at DSNSCON2 + x'172C' and                      *
  * other abends due to same storage block                       *
  * allocated to different threads after a                       *
  * thread abends during contraction of a                        *
  * 64-bit pool.                                                 *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When a thread abends during contraction while processing a
  
  64-bit pool, the FRR recovery does not reset the contraction
  
  flag in the PVTS control block.  When those segments are placed
  
  back to the large object and allocated to another thread, the
  
  residual flag can cause the segments to be placed back to the
  
  large object again during contraction even if they are still
  
  used by the thread.  This can lead to the situation that the
  
  same storage block can be allocated and used by at least two
  
  different processes by either the same or different thread.
  
  
  
  Similar problem may happen when a thread is cancelled by
  
  operator during contraction of a 64-bit pool.
  

Problem conclusion

• The recovery routine in contraction has been changed to reset
  
  the contraction flag in PVTS for the above the bar, 64bit,
  
  pools.
  

Temporary fix

Comments

• ×**** PE17/02/15 FIX IN ERROR. SEE APAR PI76725  FOR DESCRIPTION
  

APAR Information

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

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

  UI44141

Modules/Macros

• DSNSCON2
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RC10 PSY UI44141

     UP17/02/08 P F702

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.