Python crashes at interpreter shutdown when running this script which starts a misconfigured SSL server:
import ssl
import socket
import sys
import threading
import time
SERVER_ADDR = ("127.0.0.1", 37017)
CA_FILE = "test/certificates/ca.pem"
SERVER_CERT = "test/certificates/server.pem"
CLIENT_CERT = "test/certificates/client.pem"
def run_server():
# Intentionally omit cafile/load_cert_chain causes CPython to crash
context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)#, cafile=CA_FILE)
# context.load_cert_chain(SERVER_CERT)
context.check_hostname = False
context.verify_mode = ssl.CERT_NONE
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server = context.wrap_socket(server, server_side=True)
server.bind(SERVER_ADDR)
server.listen(0)
while True:
connection, client_address = server.accept()
t = threading.Thread(target=handle_server_connection, args=(connection, client_address), daemon=True)
t.start()
def handle_server_connection(connection, client_address):
client_address = f"{client_address[0]}:{client_address[1]}"
print(f"server opened connection from {client_address}")
while True:
data = connection.recv(1024)
if not data:
print(f"server closed connection from {client_address}")
return
print(f"server got data from {client_address}: {data}")
if data == b"CLOSE":
print(f"server closing {client_address}")
connection.close()
return
# Echo back
connection.sendall(data)
def get_client():
# Intentionally omit cafile/load_cert_chain causes CPython to crash
context = ssl.create_default_context() #cafile=CA_FILE)
# context.load_cert_chain(CLIENT_CERT)
context.check_hostname = False
context.verify_mode = ssl.CERT_NONE
print(f"client connecting")
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.connect(SERVER_ADDR)
sock = context.wrap_socket(sock)
return sock
def main():
print(f"{sys.version=}\n{ssl.OPENSSL_VERSION=}")
server = threading.Thread(target=run_server, daemon=True)
server.start()
time.sleep(1)
client1 = get_client()
if __name__ == "__main__":
main()
$ python repro-ssl-crash-bug.py
sys.version='3.13.0 (v3.13.0:60403a5409f, Oct 7 2024, 00:37:40) [Clang 15.0.0 (clang-1500.3.9.4)]'
ssl.OPENSSL_VERSION='OpenSSL 3.0.15 3 Sep 2024'
client connecting
Exception in thread Thread-1 (run_server):
Traceback (most recent call last):
Traceback (most recent call last):
File "/Users/shane/git/mongo-python-driver/repro-pypy-ssl-bug.py", line 71, in <module>
main()
~~~~^^
File "/Users/shane/git/mongo-python-driver/repro-pypy-ssl-bug.py", line 67, in main
client1 = get_client()
File "/Users/shane/git/mongo-python-driver/repro-pypy-ssl-bug.py", line 58, in get_client
sock = context.wrap_socket(sock)
File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/ssl.py", line 455, in wrap_socket
return self.sslsocket_class._create(
~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
sock=sock,
^^^^^^^^^^
...<5 lines>...
session=session
^^^^^^^^^^^^^^^
)
^
File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/threading.py", line 1041, in _bootstrap_inner
self.run()
~~~~~~~~^^
File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/threading.py", line 992, in run
self._target(*self._args, **self._kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/ssl.py", line 1076, in _create
self.do_handshake()
~~~~~~~~~~~~~~~~~^^
File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/ssl.py", line 1372, in do_handshake
self._sslobj.do_handshake()
~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/Users/shane/git/mongo-python-driver/repro-pypy-ssl-bug.py", line 26, in run_server
connection, client_address = server.accept()
~~~~~~~~~~~~~^^
File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/ssl.py", line 1418, in accept
newsock = self.context.wrap_socket(newsock,
do_handshake_on_connect=self.do_handshake_on_connect,
suppress_ragged_eofs=self.suppress_ragged_eofs,
server_side=True)
File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/ssl.py", line 455, in wrap_socket
return self.sslsocket_class._create(
~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
sock=sock,
^^^^^^^^^^
...<5 lines>...
session=session
^^^^^^^^^^^^^^^
)
^
File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/ssl.py", line 1076, in _create
self.do_handshake()
~~~~~~~~~~~~~~~~~^^
File "/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/ssl.py", line 1372, in do_handshake
self._sslobj.do_handshake()
~~~~~~~~~~~~~~~~~~~~~~~~~^^
ssl.SSLError: [SSL: SSLV3_ALERT_HANDSHAKE_FAILURE] sslv3 alert handshake failure (_ssl.c:1020)
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=0x00000001021ec560)
Current thread 0x0000000205de8f80 (most recent call first):
<no Python frame>
[1] 45370 abort python repro-pypy-ssl-bug.py
Here's some of the apple crash report:
Translated Report (Full Report Below)
-------------------------------------
Process: Python [45370]
Path: /Library/Frameworks/Python.framework/Versions/3.13/Resources/Python.app/Contents/MacOS/Python
Identifier: org.python.python
Version: 3.13.0 (3.13.0)
Code Type: ARM-64 (Native)
Parent Process: zsh [45114]
Responsible: pycharm [65042]
User ID: 502
Date/Time: 2025-01-31 16:19:54.0206 -0800
OS Version: macOS 14.7.2 (23H311)
Report Version: 12
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Termination Reason: Namespace SIGNAL, Code 6 Abort trap: 6
Terminating Process: Python [45370]
Application Specific Information:
abort() called
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x19df595d0 __pthread_kill + 8
1 libsystem_pthread.dylib 0x19df91c20 pthread_kill + 288
2 libsystem_c.dylib 0x19de9ea30 abort + 180
3 Python 0x101f6e710 _Py_FatalErrorFormat + 40
4 Python 0x101fd9418 _enter_buffered_busy + 288
5 Python 0x101fdbd3c _io__Buffered_flush + 600
6 Python 0x101d39f04 method_vectorcall_NOARGS + 120
7 Python 0x101d298e4 PyObject_VectorcallMethod + 152
8 Python 0x101fe1784 _io_TextIOWrapper_flush + 140
9 Python 0x101d39f04 method_vectorcall_NOARGS + 120
10 Python 0x101d298e4 PyObject_VectorcallMethod + 152
11 Python 0x101f69e10 flush_std_files + 448
12 Python 0x101f69724 fatal_error + 396
13 Python 0x101f6e7cc _Py_FatalErrorFormat + 228
14 Python 0x101fd9418 _enter_buffered_busy + 288
15 Python 0x101fdb958 _io_BufferedWriter_write + 1240
16 Python 0x101d3a14c method_vectorcall_O + 116
17 Python 0x101d298e4 PyObject_VectorcallMethod + 152
18 Python 0x101fe2a2c _textiowrapper_writeflush + 656
19 Python 0x101fe1760 _io_TextIOWrapper_flush + 104
20 Python 0x101d39f04 method_vectorcall_NOARGS + 120
21 Python 0x101d298e4 PyObject_VectorcallMethod + 152
22 Python 0x101f69e10 flush_std_files + 448
23 Python 0x101f6a26c _Py_Finalize + 320
24 Python 0x101fa0460 Py_RunMain + 620
25 Python 0x101fa1dcc pymain_main + 500
26 Python 0x101fa1f34 Py_BytesMain + 40
27 dyld 0x19dc07154 start + 2476
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000000 x1: 0x0000000000000000 x2: 0x0000000000000000 x3: 0x0000000000000000
x4: 0xfffffffffffb7d30 x5: 0x0000000000000020 x6: 0x000000000000003e x7: 0x000000003b9ac618
x8: 0x88027b3a413da6b8 x9: 0x88027b3844e32938 x10: 0x00000001022156f8 x11: 0x0000000000000000
x12: 0x0000000000000000 x13: 0x0000000000000001 x14: 0x00000001021b0078 x15: 0x00000001021b0068
x16: 0x0000000000000148 x17: 0x00000002104e6e40 x18: 0x0000000000000000 x19: 0x0000000000000006
x20: 0x0000000205de8f80 x21: 0x0000000000000103 x22: 0x0000000205de9060 x23: 0x8000000000000001
x24: 0x7fffffffffffffde x25: 0x0000000100b9ec88 x26: 0x0000000000000000 x27: 0x0000000000000000
x28: 0x0000000000000000 fp: 0x000000016f28a6e0 lr: 0x000000019df91c20
sp: 0x000000016f28a6c0 pc: 0x000000019df595d0 cpsr: 0x40001000
far: 0x0000000000000000 esr: 0x56000080 Address size fault
I also see the same crash on Python 3.9. Is this expected behavior?
CPython versions tested on:3.13
Operating systems tested on:macOS
Output from running 'python -VV' on the command line:Python 3.13.0 (v3.13.0:60403a5409f, Oct 7 2024, 00:37:40) [Clang 15.0.0 (clang-1500.3.9.4)]
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