New submission from Xinmeng Xia <xi...@smail.nju.edu.cn>:
This program is initially from
"cpython/Lib/test/crashers/warnings_del_crasher.py" in Python 2.7. The original
case is fixed for all version of Python and removed from "crashers" directory.
However, if we replace the statement "for i in range(10):" of original program
with the statement "for do_work in range(10):" . The race will happen again,
and it will crash Python 3.7 - 3.10.
==================================================
import threading
import warnings
class WarnOnDel(object):
def __del__(self):
warnings.warn("oh no something went wrong", UserWarning)
def do_work():
while True:
w = WarnOnDel()
-for i in range(10):
+for do_work in range(10):
t = threading.Thread(target=do_work)
t.setDaemon(1)
t.start()
=================================================
Error messages on Python 3.7-3.10:
-------------------------------------------------------------------------------
Exception in thread Thread-2:
Traceback (most recent call last):
File "/usr/local/python310/lib/python3.10/threading.py", line 960, in
_bootstrap_inner
Exception in thread Thread-3:
Traceback (most recent call last):
Exception in thread Thread-4:
File "/usr/local/python310/lib/python3.10/threading.py", line 960, in
_bootstrap_inner
Exception in thread Thread-5:
Traceback (most recent call last):
self.run()
Traceback (most recent call last):
self.run()
Exception in thread Thread-6:
Exception in thread Thread-8:
Exception in thread Thread-9:
Exception in thread Thread-10:
Fatal Python error: _enter_buffered_busy: could not acquire lock for
<_io.BufferedWriter name='<stderr>'> at interpreter shutdown, possibly due to
daemon threads
Python runtime state: finalizing (tstate=0x2679180)
Current thread 0x00007f3481d3a700 (most recent call first):
<no Python frame>
Aborted (core dumped)
----------
components: Interpreter Core
messages: 383883
nosy: xxm
priority: normal
severity: normal
status: open
title: Exposing a race in the "_warnings" resulting Python parser crash
type: crash
versions: Python 3.10, Python 3.7, Python 3.8, Python 3.9
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42763>
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