Advisory: v5.1b Patch kit #5 requires an additional patch

HellO:

  I thought I will warn everybody about a possible AdvFS hang
  after installing patch kit 5.1b-3.

  If you use clones with AdvFS, then there will be a racing
  condition that will force the entire system to hang. There will
  be two problems:

  1. A deadlock can occur between a migration and a flush on a
  file. One thread will be waiting in insert_actRange_onto_list()
  and the other in cfs_condio_cc_excl_mode_enter().

  2. A deadlock can occur when a clone fileset is mounted, and
  there are racing threads that are modifying a common file via
  memory mapping.  One thread will be waiting in cow_get_locks
  and the other in msfs_mmap.
   
  We were hit by this bug. Fortunately, there is a patch
  available at ITRC T64KIT0025601-V51BB26-E-20050513. You will
  want to install this if you plan to use clones with AdvFS.

  Cheers,

   -- mahendra
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   A. Mahendra Rajah             Email: [email protected]
   Tru64 UNIX Systems Manager    Phone:            (306) 585-4496
   Dept. of Computing Services   FAX:              (306) 337-2324
   University of Regina,
   Regina, Sask., S4S 0A2
   Canada.       
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