SIGKILL failed to kill process

[vladbogo]

Hi,

I noticed the following error at the end of the testing step (https://buildbot.mariadb.org/#/builders/24/builds/5212). It appears that the steps has reached timeout and then the error occurred. However, the testing script has successfully run and finished. Any thoughts on what might be the cause?

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/twisted/internet/defer.py", line 501, in errback
    self._startRunCallbacks(fail)
  File "/usr/local/lib/python3.6/dist-packages/twisted/internet/defer.py", line 568, in _startRunCallbacks
    self._runCallbacks()
  File "/usr/local/lib/python3.6/dist-packages/twisted/internet/defer.py", line 654, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "/usr/local/lib/python3.6/dist-packages/twisted/internet/defer.py", line 1475, in gotResult
    _inlineCallbacks(r, g, status)
--- <exception caught here> ---
  File "/usr/local/lib/python3.6/dist-packages/buildbot/process/buildstep.py", line 567, in startStep
    self.results = yield self.run()
  File "/usr/local/lib/python3.6/dist-packages/buildbot/process/buildstep.py", line 697, in run
    results = yield self._start_deferred
  File "/usr/local/lib/python3.6/dist-packages/twisted/internet/defer.py", line 1418, in _inlineCallbacks
    result = g.send(result)
  File "/usr/local/lib/python3.6/dist-packages/buildbot/process/buildstep.py", line 697, in run
    results = yield self._start_deferred
builtins.TypeError: must be str, not bytes

Cheers!