Public bug reported:
== 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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1776254
Title:
CacheFiles: Error: Overlong wait for old active object to go away.
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