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
time.sleep(2)
print('program blocked; aborting')
os._exit(2)
t = threading.Thread(target=killer)
t.daemon = True
t.start()
# This is the trace function
def func(frame, event, arg):
threading.current_thread()
return func
sys.settrace(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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Python tracker <[email protected]>
<http://bugs.python.org/issue18746>
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