[Bug 1535741] Re: UnicodeDecodeError when command report gibberish

[Martin Pitt]

http://anonscm.debian.org/cgit/autopkgtest/autopkgtest.git/commit/?id=717c3491d

** Changed in: autopkgtest (Ubuntu)
   Importance: High => Medium

** Changed in: autopkgtest (Ubuntu)
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1535741

Title:
  UnicodeDecodeError when command report gibberish

Status in autopkgtest package in Ubuntu:
  Fix Committed

Bug description:
  We get a lot of errors like in
  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
  /autopkgtest-xenial/xenial/s390x/h/hg-git/20160119_123943@/log.gz
  after all tests finished and the testbed gets cleaned up:

  adt-run [12:39:41]: @@@@@@@@@@@@@@@@@@@@ summary
  testsuite            PASS
  mercurial-git        PASS
  Unexpected error:
  Traceback (most recent call last):
    File "/home/ubuntu/autopkgtest/lib/VirtSubproc.py", line 702, in mainloop
      command()
    File "/home/ubuntu/autopkgtest/lib/VirtSubproc.py", line 640, in command
      r = f(c, ce)
    File "/home/ubuntu/autopkgtest/lib/VirtSubproc.py", line 116, in cmd_close
      cleanup()
    File "/home/ubuntu/autopkgtest/lib/VirtSubproc.py", line 665, in cleanup
      caller.hook_cleanup()
    File "/home/ubuntu/autopkgtest/virt-subproc/adt-virt-lxc", line 275, in hook_cleanup
      stderr=subprocess.PIPE)
    File "/home/ubuntu/autopkgtest/lib/VirtSubproc.py", line 148, in execute_timeout
      (out, err) = sp.communicate(instr)
    File "/usr/lib/python3.5/subprocess.py", line 1055, in communicate
      stderr = self.stderr.read()
    File "/usr/lib/python3.5/codecs.py", line 321, in decode
      (result, consumed) = self._buffer_decode(data, self.errors, final)
  UnicodeDecodeError: 'utf-8' codec can't decode byte 0x85 in position 467: invalid start byte

  So it seems lxc-stop is sending some gibberish or interrupted stream.
  Don't fail like that and instead just show the original error message.

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