Message195244
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 :-) |
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Date |
User |
Action |
Args |
2013-08-15 10:14:20 | vstinner | set | recipients:
+ vstinner, ncoghlan, pitrou |
2013-08-15 10:14:20 | vstinner | set | messageid: <1376561660.51.0.498019291184.issue18746@psf.upfronthosting.co.za> |
2013-08-15 10:14:20 | vstinner | link | issue18746 messages |
2013-08-15 10:14:19 | vstinner | create | |
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