STINNER Victor <[email protected]> added the comment:
I wrote 3 scripts to reproduce the bug in a more reliable way. So I just have
to type "bisect" and it runs the test 12 times.
(1) bisect.bat:
---
@"C:\vstinner\python\3.9\PCbuild\amd64\python_d.exe" bisect.py
---
(2) bisect.py:
---
import subprocess
import os
import sys
BISECT = False
def run(*args):
print("+ ", ' '.join(args))
env = dict(os.environ)
env['PYTHONFAULTHANDLER'] = '1'
proc = subprocess.run(args, env=env)
exitcode = proc.returncode
if exitcode:
print()
print(f"COMMAND FAILED: {exitcode}")
if BISECT:
print()
print("type: git bisect bad")
sys.exit(exitcode)
python = sys.executable
#script = "win_py399_crash_reproducer.py"
script = "bug.py"
nrun = 12
for i in range(1, nrun+1):
print(f"Run #{i}/{nrun}")
if i % 2:
run(python, script)
else:
run(python, "-X", "dev", script)
if BISECT:
print()
print("Not reproduced")
print()
run("git", "checkout", ".")
run("git", "bisect", "good")
---
(3) win_py399_crash_reproducer.py (import "_sre"):
---
# When this program is run on windows using python 3.9.9 it crashes about 50%
# of the time.
import _testcapi
import threading
code = """
import _sre
print("exit subinterpreter")
"""
def doIt():
_testcapi.run_in_subinterp(code)
tt=[]
for i in range(16):
t = threading.Thread(target=doIt)
t.start()
tt.append(t)
for t in tt:
t.join()
print("exit main")
---
Example:
---
vstinner@DESKTOP-DK7VBIL C:\vstinner\python\3.9>bisect
Run #1/12
+ C:\vstinner\python\3.9\PCbuild\amd64\python_d.exe bug.py
Run #2/12
+ C:\vstinner\python\3.9\PCbuild\amd64\python_d.exe -X dev bug.py
Run #3/12
+ C:\vstinner\python\3.9\PCbuild\amd64\python_d.exe bug.py
Windows fatal exception: access violation
(...)
Current thread 0x00000420 (most recent call first):
File "C:\vstinner\python\3.9\bug.py", line 13 in doIt
File "C:\vstinner\python\3.9\lib\threading.py", line 910 in run
File "C:\vstinner\python\3.9\lib\threading.py", line 973 in _bootstrap_inner
File "C:\vstinner\python\3.9\lib\threading.py", line 930 in _bootstrap
(...)
COMMAND FAILED: 3221225477
---
----------
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Python tracker <[email protected]>
<https://bugs.python.org/issue46070>
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