I don't understand the error, it doesn't make sense. It *seems* like faulthandler.cancel_dump_traceback_later attribute has been set to an int, but I don't see how it could be possible. Or the call raises the TypeError? But the call can be summarized to:

    Py_CLEAR(thread.file);

and I don't see how Py_CLEAR() can trigger a TypeError.

https://buildbot.python.org/all/#/builders/170/builds/175

ERROR: test_sigwaitinfo (__main__.SignalEINTRTest)

Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.7.koobs-freebsd10.nondebug/build/Lib/test/eintrdata/eintr_tester.py", line 71, in tearDown
    faulthandler.cancel_dump_traceback_later()
TypeError: 'int' object is not callable