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[Launchpad Bug Tracker <1776254@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.13.0-158.208

---------------
linux (3.13.0-158.208) trusty; urgency=medium

  * linux: 3.13.0-158.208 -proposed tracker (LP: #1788764)

  * CVE-2018-3620 // CVE-2018-3646
    - SAUCE: x86/fremap: Invert the offset when converting to/from a PTE

  * BUG: scheduling while atomic (Kernel : Ubuntu-3.13 + VMware: 6.0 and late)
    (LP: #1780470)
    - VSOCK: sock_put wasn't safe to call in interrupt context
    - VSOCK: Fix lockdep issue.
    - VSOCK: Detach QP check should filter out non matching QPs.

  * CacheFiles: Error: Overlong wait for old active object to go away.
    (LP: #1776254)
    - cachefiles: Fix missing clear of the CACHEFILES_OBJECT_ACTIVE flag
    - cachefiles: Wait rather than BUG'ing on "Unexpected object collision"

  * fscache cookie refcount updated incorrectly during fscache object allocation
    (LP: #1776277)
    - fscache: Fix reference overput in fscache_attach_object() error handling

  * FS-Cache: Assertion failed: FS-Cache: 6 == 5 is false (LP: #1774336)
    - Revert "UBUNTU: SAUCE: CacheFiles: fix a read_waiter/read_copier race"
    - fscache: Allow cancelled operations to be enqueued
    - cachefiles: Fix refcounting bug in backing-file read monitoring

 -- Kleber Sacilotto de Souza <kleber.souza@xxxxxxxxxxxxx>  Fri, 24 Aug
2018 15:08:23 +0000

** Changed in: linux (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1776254

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

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  == SRU Justification ==

  [Impact]
  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!

  [Cause]
    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 looked.
    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.

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

  [Testcase]
  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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