PM30611: 1) ABENDS0C4 DSNISRTI OFFSETCE66 2) ABEND04E RC00C90101 DSNIROBD ERQUAL5003

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• 1) ABEND 0C4 DSNISRTI CE66 - DVV storage overlay due to lack of
  serialization when getting storage from DVS.
     Also S0C4 in modules DSNISFS DSNISRID DSNIPHC DSNIVOBD
     DSNIOST2 DSNIRNXT DSNSVBK and 04E abends 00E20005 or
     00E20029 in DSNSVBK and 00E20028 in DSNSTACK
                                                   (d146780)
  2) ABEND 04E 00C90101 DSNIROBD ERQUAL 5003 - new system page
     is not forced out to group buffer pool, which caused a reader
     to encounter a zero page on the other data sharing member
                                                   (d146451)
  Additional symptom:  ABEND0C1 ( ABENDS0C1 ) on a bad branch
  from DSNKTRAV as IXDCMTCRTP area overlaid with
  DVVL blocks.  ( d147977 )
  DB2OVRLAY/K
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of DB2 for zOS data versioning     *
  ****************************************************************
  * PROBLEM DESCRIPTION: 1. ABEND0C4 DSNISRTI+CE66 while         *
  *                         accessing internal Data              *
  *                         Versioning control block.            *
  *                         Similar ABEND0C4 could be in         *
  *                         DSNISFS,DSNISRID,DSNIPHC,DSNIVOBD,   *
  *                         DSNIOST2, DSNIRNXT, DSNSVBK and      *
  *                         ABEND04E RC00E20005 or RC00E20029    *
  *                         in DSNSVBK and RC00E20028 in         *
  *                         DSNSTACK.                            *
  *                      2. ABEND04E RC00C90101 DSNIROBD         *
  *                         ERQUAL5003 while reading OBD         *
  *                         information from system page.        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  1.When concurrent tasks were trying to build Data Versioning
    internal control block, a latch is required to get the
    storage from the storage pool.  Currently, there are some
    code path in DB2 that did not get the latch when the storage
    is acquired.  Without a latch to serialize concurrent tasks
    will cause the storage overlay and abend.
  
  2.In Data Sharing system, the SYSTEM page should be written
    out to group buffer pool as soon as release of the page
    during insert.  In some case, DB2 did not write out the page
    immediately because of some internal flag was incorrectly
    set.  This may result other member from the data sharing
    system to read a zero page and caused the reported abend.
  

Problem conclusion

• 1.DB2 code was changed to get the latch when storage was
    acquired for building Data Versioning control block.
  2.DB2 code was changed to immediately write out the SYSTEM
    page by correctly setting the internal flag.
  

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:

  UK66193 UK66194

Modules/Macros

• DSNISEGD
  DSNISEGF
  DSNISGRT
  DSNIVOBD
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UK66193

     UP11/05/05 P F105

• R910 PSY UK66194

     UP11/05/05 P F105

Fix is available

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