[Bug 1549425] Re: ERROR: testbed failure: testbed auxverb failed with exit code 255

[Martin Pitt]

The auxverb is "ssh" in this case, and it exiting with 255 means that
the ssh connection was interrupted. Could indeed be a flaky cable, or
sshd getting killed. It would help if you can add the --debug option to
adt-run, then you see the commands that are being sent. But either way,
probably not much that we can do on the adt side -- the ssh runner needs
ssh, if that goes down we lose :-(

** Changed in: autopkgtest (Ubuntu)
       Status: New => Incomplete

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Title:
  ERROR: testbed failure: testbed auxverb failed with exit code 255

Status in autopkgtest package in Ubuntu:
  Incomplete

Bug description:
  Hi, not sure if we're doing something wrong while testing devices in
  our lab Jenkin--could very easily be "flaky USB cable"--just need more
  help than the error is providing :) .

  I'll attach a full log, but the gist is

  adt-run [17:47:12]: testbed dpkg architecture: armhf
  adt-run [17:47:15]: testbed running kernel: Linux 3.10.35+ #1 SMP PREEMPT Mon Jan 11 05:26:56 UTC 2016
  adt-run [17:47:15]: @@@@@@@@@@@@@@@@@@@@ unbuilt-tree /var/lib/jenkins/slaves/arale-06/workspace/test-alesage-sanity-arale-vivid/qa-jenkins-jobs/ubuntu-system-tests
  Exit request sent.
  adt-run [17:47:17]: ERROR: testbed failure: testbed auxverb failed with exit code 255

  Adding sleeps seems to help in some cases, which of course is a sign
  that more investigation is warranted--what's the source of this error?

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