[New-bugs-announce] [issue18746] test_threading.test_finalize_with_trace() fails on FreeBSD buildbot

STINNER Victor report at bugs.python.org
Thu Aug 15 12:14:20 CEST 2013

New submission from STINNER Victor:

The following test fails on FreeBSD buildbot:

    def test_finalize_with_trace(self):
        # Issue1733757
        # Avoid a deadlock when sys.settrace steps into threading._shutdown
        assert_python_ok("-c", """if 1:
            import sys, threading

            # A deadlock-killer, to prevent the
            # testsuite to hang forever
            def killer():
                import os, time
                print('program blocked; aborting')
            t = threading.Thread(target=killer)
            t.daemon = True

            # This is the trace function
            def func(frame, event, arg):
                return func


I ran it manually on my FreeBSD 9.1 VM, I get the following error. I don't know if it's the same error than the buildbot.
# clear builtins._
# restore sys.stderr
# cleanup __main__
# cleanup[1] _sysconfigdata
# cleanup[1] threading
Exception ignored in: <function WeakSet.__init__.<locals>._remove at 0x801b11058>
Traceback (most recent call last):
  File "/usr/home/haypo/prog/python/default/Lib/_weakrefset.py", line 38, in _remove
  File "x.py", line 17, in func
AttributeError: 'NoneType' object has no attribute 'current_thread'
# cleanup[1] _weakrefset
# cleanup[3] _codecs
PyThreadState_Clear: warning: thread still has a frame

The weakref is probably threading._dangling.

IMO Py_Finalize() should first clear the trace function. Tracing Python exception while Python is dying (exiting) is insane. I'm surprised that it works :-)

messages: 195244
nosy: haypo, ncoghlan, pitrou
priority: normal
severity: normal
status: open
title: test_threading.test_finalize_with_trace() fails on FreeBSD buildbot
versions: Python 3.4

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