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.so...@canonical.com> 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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