[users at bb.net] Server Crash

[Chris Spencer]

My Buildbot 0.9.5 server randomly crashed today, with twistd.log showing:

2017-05-16 21:00:19+0000 [-] Unhandled Error
    Traceback (most recent call last):
      File
"/usr/local/myproject/.env/local/lib/python2.7/site-packages/twisted/internet/defer.py",
line 1030, in _cbDeferred
        self.callback(self.resultList)
      File
"/usr/local/myproject/.env/local/lib/python2.7/site-packages/twisted/internet/defer.py",
line 457, in callback
        self._startRunCallbacks(result)
      File
"/usr/local/myproject/.env/local/lib/python2.7/site-packages/twisted/internet/defer.py",
line 565, in _startRunCallbacks
        self._runCallbacks()
      File
"/usr/local/myproject/.env/local/lib/python2.7/site-packages/twisted/internet/defer.py",
line 651, in _runCallbacks
        current.result = callback(current.result, *args, **kw)
    --- <exception caught here> ---
      File
"/usr/local/myproject/.env/local/lib/python2.7/site-packages/twisted/internet/base.py",
line 433, in _continueFiring
        callable(*args, **kwargs)
      File
"/usr/local/myproject/.env/local/lib/python2.7/site-packages/txrequests/sessions.py",
line 46, in <lambda>
        reactor.addSystemEventTrigger("after", "shutdown", lambda:
pool.stop())
      File
"/usr/local/myproject/.env/local/lib/python2.7/site-packages/twisted/python/threadpool.py",
line 274, in stop
        self._team.quit()
      File
"/usr/local/myproject/.env/local/lib/python2.7/site-packages/twisted/_threads/_team.py",
line 226, in quit
        self._quit.set()
      File
"/usr/local/myproject/.env/local/lib/python2.7/site-packages/twisted/_threads/_convenience.py",
line 35, in set
        self.check()
      File
"/usr/local/myproject/.env/local/lib/python2.7/site-packages/twisted/_threads/_convenience.py",
line 46, in check
        raise AlreadyQuit()
    twisted._threads._ithreads.AlreadyQuit:

What is the cause of this?
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