PK99747: INCOMPATIBLE RETAINED LOCKS DETECTED DURING GROUP RESTART.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Module DXRRL2R2:03 RETLOCK Detected Incompatible Lock
  detected.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: DB2 data sharing users.                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: Failures during a group restart, when   *
  *                      a page set is in GRECP state and has    *
  *                      indoubt URs with an interest in it:     *
  *                      - For V8 only, abend in IRLM module     *
  *                        DXRRL2R2 due to incompatible retained *
  *                        lock.                                 *
  *                      - For both V8 and V9, ABEND04E          *
  *                        RC00C2010E in DSNB1LPL.               *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  For DB2 V8, an attempt to open a page set in GRECP state will be
  treated as a failure, and the page set will immediately be
  closed and its P-lock released.  If the page set has indoubt URs
  interested in it, it will be logged during DB2 checkpoints, but
  as "non-GBP-dependent" since no P-lock is held.  If two members
  have indoubt URs, then they will both be logging the page set as
  "non-GBP-dependent".  In the event of a group restart, DB2 will
  attempt to build retained page set P-locks for both members
  based on these log records, and will try to build a retained X
  lock for both.  This causes an abend in IRLM since the locks are
  incompatible.
  
  For both V8 and V9, a group restart with indoubt URs and a page
  set in GRECP state may attempt to put the page set into LPL.
  The LPL logic may try to use a peer member's restart LRSN as
  the starting LRSN for the LPL range, but if that member was
  quiesced then its restart LRSN will be x'FFFFFFFFFFFF'.  Using
  that value results in an ABEND04E RC00C2010E in DSNB1LPL, since
  it will be higher than the ending LRSN.
  

Problem conclusion

• The V8 page set open logic has been modified to hold on to the
  page set P-lock if the page set is in GRECP state.  This ensures
  that it will correctly be logged as GBP-dependent.
  
  The V8 and V9 LPL logic has been modified to not consider the
  peer's restart LRSN if it is set to x'FFFFFFFFFFFF' (member was
  quiesced).
  

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:

  UK52192 UK52193

Modules/Macros

• DSNB1LPL DSNB1OPP DSNB1OPS
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• R810 PSY UK52192

     UP09/12/08 P F912

• R910 PSY UK52193

     UP09/12/08 P F912

Fix is available

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