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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:
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@"C:\vstinner\python3円.9\PCbuild\amd64\python_d.exe" bisect.py
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(2) bisect.py:
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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")
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(3) win_py399_crash_reproducer.py (import "_sre"):
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# 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")
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Example:
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vstinner@DESKTOP-DK7VBIL C:\vstinner\python3円.9>bisect
Run #1/12
+ C:\vstinner\python3円.9\PCbuild\amd64\python_d.exe bug.py
Run #2/12
+ C:\vstinner\python3円.9\PCbuild\amd64\python_d.exe -X dev bug.py
Run #3/12
+ C:\vstinner\python3円.9\PCbuild\amd64\python_d.exe bug.py
Windows fatal exception: access violation
(...)
Current thread 0x00000420 (most recent call first):
 File "C:\vstinner\python3円.9\bug.py", line 13 in doIt
 File "C:\vstinner\python3円.9\lib\threading.py", line 910 in run
 File "C:\vstinner\python3円.9\lib\threading.py", line 973 in _bootstrap_inner
 File "C:\vstinner\python3円.9\lib\threading.py", line 930 in _bootstrap
(...)
COMMAND FAILED: 3221225477
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