After adding some debug I see that multipath is opening the device,
hence bd_openers > 0 and we get the EBUSY return.  Killing multipath
fixes this.  It also explains why we can't remove the module at the end
of the test.

** Changed in: linux-lts-xenial (Ubuntu)
   Importance: Undecided => Low

** Changed in: linux-lts-xenial (Ubuntu)
       Status: New => In Progress

** Changed in: linux-lts-xenial (Ubuntu)
     Assignee: (unassigned) => Colin Ian King (colin-king)

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https://bugs.launchpad.net/bugs/1798291

Title:
  ubuntu_zram_smoke_test failed on ppc64el with Trusty 4.4

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