PI15304: DSNB1LDA ISSUING DSNVCNCL WITHOUT HOLDING THE VLCASAGT LATCH AND CAUSED THE SYSTEM DOWN WITH REASON CODE OF 00F30420

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• This is a serialization problem with DSNB1LDA issuing DSNVCNCL
  without holding the VLCASAGT latch when cancel the ACEEBA
  and then caused the system down with reason code of RC00F30420
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All DB2 users.                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: MSGDSNV086E DB2 ABNORMAL TERMINATION    *
  *                      REASON=00F30420 running REORG utility   *
  *                      with FORCE option                       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When REORG FORCE cancels a thread, the cancel operation picks up
  the EB control block address without holding a system latch.
  When the EB address is used for thread cancellation, the EB
  address may have been reused by a different thread. As a result,
  a wrong thread may get cancelled, and depending on the
  activities of the cancelled thread, DB2 may be brought down.
  

Problem conclusion

• DB2 has been fixed to acquire a system latch before picking up
  the EB address for thread cancellation. The latch protects the
  EB address from getting freed and reused until the cancel
  operation is complete.
  

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:

  UI18723 UI18724

Modules/Macros

• DSNB1DRA DSNB1LDA DSNB1LDN DSNB1LRR
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UI18723

     UP14/06/25 P F406

• RB10 PSY UI18724

     UP14/06/25 P F406

Fix is available

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