Comment # 9 on bug 908706 from Neil Brown

Hi ... early April is close to late January - right?

sorry for the delay.

There are no upstream patches to cachefiled and nothing in the kernel which
looks relevant, so it is probable that this bug still exists.

Firstly, could you check that /var/cache/fscache isn't running out of space.
In particular, the output of:

 df /var/cache/fscache
 du -s /var/cache/fscache
 cat /etc/cachefilesd.conf

would be helpful - if only to confirm there is nothing odd there.

Secondly, can you get me a full kernel log of a cache on the most recent kernel
that you can conveniently run?  One way to get a kernel log would be to
configure netconsole.  I can give details if you need them.  This requires
another computer running Linux to gather the logs.

It might also help to turn on cachefiles debugging.
Either 
 echo 7 > /sys/module/cachefiles/parameters/debug

or add
  debug 7

to /etc/cachefilesd.conf

Thanks.