Crash report
What happened?
Calling many different methods on a _ssl._SSLSocket() instance causes a segfault, for example:
import _ssl
s = _ssl._SSLSocket()
s.shutdown()
# Segmentation fault
Other methods known to segfault are do_handshake, get_channel_binding, get_verified_chain (but not get_unverified_chain), getpeercert, read, verify_client_post_handshake, write. Backtrace looks like:
#0 0x00007ffff7b89129 in SSL_shutdown () from /lib/x86_64-linux-gnu/libssl.so.3
#1 0x00007ffff7c287bc in _ssl__SSLSocket_shutdown_impl (self=self@entry=0x20000572510) at ./Modules/_ssl.c:2710
#2 0x00007ffff7c28977 in _ssl__SSLSocket_shutdown (self=0x20000572510, _unused_ignored=<optimized out>)
at ./Modules/clinic/_ssl.c.h:557
#3 0x0000555555694039 in method_vectorcall_NOARGS (func=<method_descriptor at remote 0x20000779380>, args=0x7fffffffd298,
nargsf=<optimized out>, kwnames=<optimized out>) at Objects/descrobject.c:447
#4 0x000055555567ccec in _PyObject_VectorcallTstate (tstate=0x555555d2c2a0 <_PyRuntime+359904>,
callable=<method_descriptor at remote 0x20000779380>, args=0x7fffffffd298, nargsf=9223372036854775809, kwnames=0x0)
at ./Include/internal/pycore_call.h:167
#5 0x000055555567ce0b in PyObject_Vectorcall (callable=callable@entry=<method_descriptor at remote 0x20000779380>,
args=args@entry=0x7fffffffd298, nargsf=<optimized out>, kwnames=kwnames@entry=0x0) at Objects/call.c:327
#6 0x0000555555841c09 in _PyEval_EvalFrameDefault (tstate=tstate@entry=0x555555d2c2a0 <_PyRuntime+359904>, frame=<optimized out>,
throwflag=throwflag@entry=0) at Python/generated_cases.c.h:955
#7 0x000055555586fb1f in _PyEval_EvalFrame (throwflag=0, frame=<optimized out>, tstate=0x555555d2c2a0 <_PyRuntime+359904>)
at ./Include/internal/pycore_ceval.h:116
#8 _PyEval_Vector (tstate=tstate@entry=0x555555d2c2a0 <_PyRuntime+359904>, func=func@entry=0x20000ad32d0,
locals=locals@entry={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <type at remote 0x20000276e10>, '__spec__': None, '__builtins__': <module at remote 0x2000025c640>, '_ssl': <module at remote 0x20000778d60>, 's': <_ssl._SSLSocket at remote 0x20000572510>}, args=args@entry=0x0, argcount=argcount@entry=0, kwnames=kwnames@entry=0x0) at Python/ceval.c:1886
#9 0x000055555586fd6c in PyEval_EvalCode (co=co@entry=<code at remote 0x2000033f190>,
globals=globals@entry={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <type at remote 0x20000276e10>, '__spec__': None, '__builtins__': <module at remote 0x2000025c640>, '_ssl': <module at remote 0x20000778d60>, 's': <_ssl._SSLSocket at remote 0x20000572510>},
locals=locals@entry={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <type at remote 0x20000276e10>, '__spec__': None, '__builtins__': <module at remote 0x2000025c640>, '_ssl': <module at remote 0x20000778d60>, 's': <_ssl._SSLSocket at remote 0x20000572510>}) at Python/ceval.c:662Found using fusil by @vstinner.
CPython versions tested on:
3.10, 3.11, 3.12, 3.13, 3.14, CPython main branch
Operating systems tested on:
Linux, Windows
Output from running 'python -VV' on the command line:
Python 3.14.0a1+ experimental free-threading build (heads/main-dirty:bfc1d2504c, Nov 4 2024, 07:55:58) [GCC 11.4.0]
Linked PRs
Crash report
What happened?
Calling many different methods on a
_ssl._SSLSocket()instance causes a segfault, for example:Other methods known to segfault are
do_handshake,get_channel_binding,get_verified_chain(but notget_unverified_chain),getpeercert,read,verify_client_post_handshake,write. Backtrace looks like:Found using fusil by @vstinner.
CPython versions tested on:
3.10, 3.11, 3.12, 3.13, 3.14, CPython main branch
Operating systems tested on:
Linux, Windows
Output from running 'python -VV' on the command line:
Python 3.14.0a1+ experimental free-threading build (heads/main-dirty:bfc1d2504c, Nov 4 2024, 07:55:58) [GCC 11.4.0]
Linked PRs