PM69511: ABEND0C4 DSNB1REL OFFSET0048 REFERENCING EBSKB DUE TO AN INVALID EB IN REG 6

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• DBSN,ABND=0C4-00000038,U=SYSOPR  ,M=N  ,C=101.BMC
  -DSNB5RAP,M=DSNTFRCV,LOC=DSNIDM  .DSNB1REL+0048
  ABEND0C4 in DSNB1REL occurs referencing EBSKB due to an
  invalid EB pointer in REG6 passed from DSNB5RAP.
  .
  Other abend is also possible due to the nature of overlay.
  DSNVSRX
  .
  DB2OVRLAY/K
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All DB2 users.                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: An overlay may occur starting at        *
  *                      offset 0x33C into a 31-bit page after   *
  *                      a soft cancel of a SUSPENDed agent.     *
  *                      This may result in numerous abends      *
  *                      and possible DB2 termination. An        *
  *                      example of such an abend is an          *
  *                      ABEND0C4 in CSECT DSNB1REL.             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  If an agent is using the SUSPEND/RESUME protocol, a 31-bit
  parameter is required upon resume. The 31-bit area is
  incorrectly obtained from the suspended agent's stack. This
  will result in an overlay if a cancelling agent is attempting
  to wake up an agent suspended in another address space. Most
  often the suspended agent will be in DIST and the cancelling
  agent will either be in MSTR or DBM1.
  

Problem conclusion

• The parameter list is now obtained from stack local to the
  cancelling agent rather than the suspended agent. This will
  prevent an overlay during the resume of the suspended agent.
  
  Additional Keywords: SMCOVERLAY
  

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:

  UK81960

Modules/Macros

• DSNVSRX
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UK81960

     UP12/10/05 P F210

Fix is available

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