PM84918: REBASE -COMPLETE FAILS WITH DEADMAN LOCK TIMEOUT DURING REBASE OF A STREAM IN A UCM ENVIRONMENT WITH MULTIPLE PVOBS

Rational ClearCase Fix Pack 11 (7.1.2.11) for 7.1.2
Rational ClearCase Fix Pack 07 (8.0.0.7) for 8.0
Rational ClearCase Fix Pack 14 (7.1.2.14) for 7.1.2
Rational ClearCase Fix Pack 11 (8.0.0.11) for 8.0
Rational ClearCase Fix Pack 12 (8.0.0.12) for 8.0
Rational ClearCase Fix Pack 15 (7.1.2.15) for 7.1.2
Rational ClearCase Fix Pack 13 (8.0.0.13) for 8.0
Rational ClearCase Fix Pack 16 (7.1.2.16) for 7.1.2
Rational ClearCase Fix Pack 17 (7.1.2.17) for 7.1.2
Rational ClearCase Fix Pack 14 (8.0.0.14) for 8.0
Rational ClearCase Fix Pack 18 (7.1.2.18) for 7.1.2
Rational ClearCase Fix Pack 15 (8.0.0.15) for 8.0
Rational ClearCase Fix Pack 19 (7.1.2.19) for 7.1.2
Rational ClearCase Fix Pack 16 (8.0.0.16) for 8.0
Rational ClearCase Fix Pack 17 (8.0.0.17) for 8.0
Rational ClearCase Fix Pack 18 (8.0.0.18) for 8.0
Rational ClearCase Fix Pack 19 (8.0.0.19) for 8.0
Rational ClearCase Fix Pack 20 (8.0.0.20) for 8.0
Rational ClearCase Fix Pack 21 (8.0.0.21) for 8.0

APAR status

• Closed as program error.

Error description

• In an IBM Rational ClearCase environment involving multiple
  Project VOBs linked by a common administrative VOB, it is
  possible that simultaneous transactions in the PVOBs can cause a
  deadlock resulting in one or both processes to fail when the
  deadman lock timout is reached. One such transaction that may be
  affected is rebase completion, which involves nested
  transactions in multiple vobs when for example a stream in one
  PVOB is rebased to a baseline in another PVOB.
  
  Running 'cleartool rebase -complete' results in the following
  error on the client:
  
  Updating stream's configuration...
  cleartool: Error: Error from VOB database: '/vobs/pvob1'.
  cleartool: Error: Unable to create hlink of type 'UseBaseline'
  from 'stream1', to 'baseline1'.
  cleartool: Error: Can't update stream's configuration.
  cleartool: Error: Unable to update config.
  cleartool: Error: Unable to complete integration.
  cleartool: Error: Can't update stream's configuration.
  cleartool: Error: Unable to resume rebase.
  
  The VOB server will log the following event in the
  db_server_log:
  
  Error: Deadman lock timeout.  Client
  'client1,pid==<pid>,euid==UNIX:UID-<uid>,cleartool 'rebase'
  '-complete'' idle while holding locks.
  
  Steps to reproduce: The exact circumstances are unknown. This
  problem may only be seen under certain conditions where there is
  heavy load on multiple PVOBs and nested transactions are taking
  place in both concurrently. In theory it will only take two
  clients to reproduce the timeout.
  
  Workaround: Retry the operation until it succeeds, or lock all
  PVOBs using the -nusers switch to exempt one user whose
  operation is failing due to deadman timeout.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Rebase -complete may fail  with deadman lock timeout during
  rebase of a stream in a UCM environment with multiple PVOBs
  

Problem conclusion

• A fix is available in ClearCase versions 7.1.2.11 and
  8.0.0.7
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  CC&CC MSITE WIN

• Fixed component ID

  5724G3300

Applicable component levels

• R712 PSN

     UP