** Summary changed:

- 'testbed_script_replay_simple' test fails intermittently
+ test-umockdev tests flaky on armhf

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https://bugs.launchpad.net/bugs/1831467

Title:
  test-umockdev tests flaky on armhf

Status in umockdev package in Ubuntu:
  New

Bug description:
  [impact]

  this test fails intermittently, due to read failures when the test
  expects to read data, but the umockdev 'replay' script device doesn't
  provide the data to read.

  this appears to just be a timing issue, as the test expects the umockdev 
device to provide specific data replayed at specific times, and those times are 
very short (ms).  Looking at the autopkgtest results:
  http://autopkgtest.ubuntu.com/packages/umockdev

  it looks like the failures are mostly on armhf, presumably because
  that is run in a container and provides the least guarantee of
  accurate short usleep() timing, but it also does fail on other archs
  sometimes as well.

  [test case]

  check the previous autopkgtest logs, e.g.
  
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-cosmic/cosmic/armhf/u/umockdev/20190601_015323_8f795@/log.gz

  [regression potential]

  probably low, as it seems like this is really just a test case issue
  of expecting very specific ms-range timing.

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