We're also seeing this with 4.4.0-111-generic (on Trusty), and a very
similar hardware profile.  The boxes in question are running Swift with
a large (millions) number of objects all approx 32k in size.

I'm currently fio'ing in a test environment to try to reproduce this
away from production.

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https://bugs.launchpad.net/bugs/1724173

Title:
  bcache makes the whole io system hang after long run time

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