** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
       Status: Incomplete => Triaged

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  CacheFiles: Error: Overlong wait for old active object to go away.

Status in linux package in Ubuntu:

Bug description:
  == SRU Justification ==

  Oops during heavy NFS + FSCache + Cachefiles use:

   CacheFiles: Error: Overlong wait for old active object to go away.
   BUG: unable to handle kernel NULL pointer dereference at 0000000000000002

   CacheFiles: Error: Object already active
   kernel BUG at fs/cachefiles/namei.c:163!

    In a heavily loaded system with big files being read and truncated,
    an fscache object for a cookie is being dropped and a new object being 
    The new object being looked for has to wait for the old object to go away 
before the
    new object is moved to active state.

       Clear the flag 'CACHEFILES_OBJECT_ACTIVE' for the new object when 
       the object lookup.
       Remove the BUG() for the case where the old object is still being dropped
       and convert to WARN()

  A user has run ~100 hours of NFS stress tests and not seen this bug recur.

  [Regression Potential]
   - Limited to fscache/cachefiles.

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