PK65636: RESTART DB2 HANGS IN V8 NEW FUNCTION MODE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Restart DB2 hangs in DB2 z/OS V8 new function mode for 6-way
  data sharing members.  The thread is suspended at DSNB1CPL
  UK30649 +1E1A.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: DB2 data sharing users.                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: Hang waiting for castout, with agent    *
  *                      suspended in DSNB1CPL or DSNB1PCO.      *
  *                      If hang occurs during DB2 restart, it   *
  *                      may prevent DB2 from coming up.         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The hang is the result of a timing window between castout
  processing and a rebuild of the GBP (duplexing or otherwise).
  If the castout engine detects that a rebuild is in progress,
  it will re-queue it's work request(s) and suspend.  At the end
  of the rebuild, a process is in place to reschedule castout for
  any pagesets or partitions with work queued up.  However, if
  the castout engine is still running and in the process of re-
  queueing its work, it will not be rescheduled.  Any agents
  waiting for the castout to complete will remain suspended until
  some event occurs to cause castout to be scheduled again.
  

Problem conclusion

• The GBP rebuild process which handles rescheduling castout has
  been modified to detect any pagesets or partitions for which
  castout is already running, and to wait for that to complete
  before performing the reschedule.
  

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:

  UK37753 UK37752

Modules/Macros

• DSNB1PCD
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• R810 PSY UK37752

     UP08/07/16 P F807

• R910 PSY UK37753

     UP08/07/16 P F807

Fix is available

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