PI95746: ABEND04E RC00E20014 DSNSGMN FOLLOWED BY A SYSTEM CRASH 18/03/28 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• DT42,ABND=04E-00E20014,U=BMCUSER ,M=N  ,C=111.BMC
  -DSNB1ABO,M=DSNTFRCV,LOC=DSNSLD1 .DSNSGMN +134C
  --------------------------------------------------
  ABEND04E RC00E20014 DSNSGMN followed by a system crash.
  DSNB1IOR passed a REG1=0 parmlist to freemain, but REG9 does not
  point to a valid MMRB.
  The error occurs when a utility (ie. LOAD or
  REORG) with the PREFORMAT option is cancelled.
  
  
  Additional Keywords:
  DSNENCRYPT/K ZSA4.5
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Db2 for z/OS V11 users with PI81900          *
  *                 (UI51358) applied.                           *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABEND04E RC00E20014 in DSNSGMN,         *
  *                      followed by Db2 abnormal termination    *
  *                      RC00D94001.                             *
  *                                                              *
  *                      For data sharing users, using duplexed  *
  *                      group buffer pools:                     *
  *                       - Incorrect output, INCORROUT.         *
  *                       - ABEND04E RC00C90101, RC00C90102,     *
  *                         RC00C90105, or RC00C902xx in         *
  *                         various CSECTs.                      *
  *                       - Data/index inconsistencies reported  *
  *                         by the CHECK INDEX utility.          *
  *                       - Page regression reported by the      *
  *                         DSN1LOGP utility.                    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  PI81900 changed the way in which the preformat buffer is used
  during a preformat request, but failed to include the code to
  account for this during abend recovery.  So if an agent abends
  while performing a preformat, the recovery routine will specify
  the wrong address (the 31-bit pointer instead of the 64-bit
  pointer) when freeing the buffer.  This results in an ABEND04E
  RC00E20014 in DSNSGMN.  Since this abend occurs during agent
  abort processing, it brings down Db2.
  
  Additionally, PI81900 inadvertently removed part of the fix for
  the earlier APAR PI76386, reintroducing a data integrity
  exposure during a group buffer pool rebuild switch following
  a GBP write-around.
  

Problem conclusion

• The recovery logic for an abend during a preformat request has
  been modified to specify the correct pointer when freeing the
  preformat buffer.
  
  The deleted code from PI76386 has been restored.
  

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:

  UI55254

Modules/Macros

•    DSNB1AEX DSNB1IOR DSNB1OST DSNB1PMI DSNB1REL
  DSNB5CMX DSNB5COM DSNB5FOR DSNB5PCO DSNB5RAP DSNB5RDP DSNB5UEX
  DSNB5UTX DSNJDS01 DSNJDS02 DSNJDS03 DSNJDS06 DSNJM003 DSNJR007
  DSNJR106 DSNJR206 DSNJS001 DSNJT001 DSNJU999 DSNJW006 DSNJW007
  DSNJW008 DSNJW009 DSNJW106 DSNJW107 DSNJW127 DSNJW207 DSNJW306
  DSNJW307 DSNVMDIE
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RB10 PSY UI55254

     UP18/05/01 P F804 «

Fix is available

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