This bug was fixed in the package ubuntu-fan - 0.12.6

---------------
ubuntu-fan (0.12.6) artful; urgency=medium

  * fanatic: Add short success delay to nc_send (LP: #1721352)
  * fanatic: Catch test preparation steps failing (LP: #1718548)
  * fanatic: Add DNS checks to local-test preparation (LP: #1718548)

ubuntu-fan (0.12.5) artful; urgency=medium

  * DEP8: Fix LXD default interface detection (LP: #1718548)
  * fanctl: return error on fail_up (LP: #1719644)

 -- Stefan Bader <stefan.ba...@canonical.com>  Fri, 06 Oct 2017 12:15:38
+0200

** Changed in: ubuntu-fan (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1721352

Title:
  fanatic: nc_receive might return too slow

Status in ubuntu-fan package in Ubuntu:
  Fix Released

Bug description:
  SRU justification:

  Impact: When running the test-local-(lxd|docker) tests, the long data
  test is sending two pieces of data. In some rare cases it was observed
  that the second send was succeeding while the receive side was not
  completely closed down after getting the first part. This broke the
  test sequence and ended in both master/slave being stuck in waiting
  for data.

  Fix: Adding a short delay after each successful send avoids this
  issue. While being on this, also fixing the direction of the repeat
  counter (was counting up instead of down).

  Testcase: running the dep8 tests for the ubuntu-fan package.

  Regression risk: low (and limited to test functionality)

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