acme/client_test.py::ClientNetworkSourceAddressBindingTest::test_source_address_set
PASSED                                                                         
                                        [ 61%]
acme/crypto_util_test.py::SSLSocketAndProbeSNITest::test_probe_connection_error
PASSED                                                                         
                                            [ 62%]
acme/crypto_util_test.py::SSLSocketAndProbeSNITest::test_probe_not_recognized_name
PASSED                                                                         
                                         [ 62%]
acme/crypto_util_test.py::SSLSocketAndProbeSNITest::test_probe_ok Segmentation
fault (core dumped)

(gdb) bt
#0  0x00007fc7877a0468 in EVP_DigestSign () from
/usr/lib64/python3.7/site-packages/cryptography/hazmat/bindings/_openssl.abi3.so
#1  0x00007fc78766cb71 in tls_construct_server_key_exchange (s=0x7fc780003b80,
pkt=0x7fc786a58f30) at ssl/statem/statem_srvr.c:2804
#2  0x00007fc78765fa7f in write_state_machine (s=0x7fc780003b80) at
ssl/statem/statem.c:843
#3  state_machine (s=0x7fc780003b80, server=1) at ssl/statem/statem.c:443
#4  0x00007fc78764b9d4 in SSL_do_handshake (s=0x7fc780003b80) at
ssl/ssl_lib.c:3599
#5  0x00007fc78772acd7 in _cffi_f_SSL_do_handshake (self=<optimized out>,
arg0=<unknown at remote 0x7fc786c010a0>) at
build/temp.linux-x86_64-3.7/_openssl.c:38285
#6  0x00007fc7894b10b8 in _PyMethodDef_RawFastCallKeywords () from
/usr/lib64/libpython3.7m.so.1.0
#7  0x00007fc7894b1400 in _PyCFunction_FastCallKeywords () from
/usr/lib64/libpython3.7m.so.1.0
#8  0x00007fc78951f73d in _PyEval_EvalFrameDefault () from
/usr/lib64/libpython3.7m.so.1.0
#9  0x00007fc7894b081a in _PyFunction_FastCallKeywords () from
/usr/lib64/libpython3.7m.so.1.0
#10 0x00007fc78951f1a6 in _PyEval_EvalFrameDefault () from
/usr/lib64/libpython3.7m.so.1.0
#11 0x00007fc7894b081a in _PyFunction_FastCallKeywords () from
/usr/lib64/libpython3.7m.so.1.0
#12 0x00007fc78951f1a6 in _PyEval_EvalFrameDefault () from
/usr/lib64/libpython3.7m.so.1.0
#13 0x00007fc7894b081a in _PyFunction_FastCallKeywords () from
/usr/lib64/libpython3.7m.so.1.0
#14 0x00007fc78951adf4 in _PyEval_EvalFrameDefault () from
/usr/lib64/libpython3.7m.so.1.0
#15 0x00007fc7894b081a in _PyFunction_FastCallKeywords () from
/usr/lib64/libpython3.7m.so.1.0
#16 0x00007fc78951adf4 in _PyEval_EvalFrameDefault () from
/usr/lib64/libpython3.7m.so.1.0
#17 0x00007fc78946660a in _PyFunction_FastCallDict () from
/usr/lib64/libpython3.7m.so.1.0
#18 0x00007fc789477656 in _PyObject_Call_Prepend () from
/usr/lib64/libpython3.7m.so.1.0
#19 0x00007fc789466deb in PyObject_Call () from /usr/lib64/libpython3.7m.so.1.0
#20 0x00007fc78951c58a in _PyEval_EvalFrameDefault () from
/usr/lib64/libpython3.7m.so.1.0
#21 0x00007fc7894b081a in _PyFunction_FastCallKeywords () from
/usr/lib64/libpython3.7m.so.1.0
#22 0x00007fc78951adf4 in _PyEval_EvalFrameDefault () from
/usr/lib64/libpython3.7m.so.1.0
#23 0x00007fc7894b081a in _PyFunction_FastCallKeywords () from
/usr/lib64/libpython3.7m.so.1.0
#24 0x00007fc78951adf4 in _PyEval_EvalFrameDefault () from
/usr/lib64/libpython3.7m.so.1.0
#25 0x00007fc78946660a in _PyFunction_FastCallDict () from
/usr/lib64/libpython3.7m.so.1.0
#26 0x00007fc789477656 in _PyObject_Call_Prepend () from
/usr/lib64/libpython3.7m.so.1.0
#27 0x00007fc789466deb in PyObject_Call () from /usr/lib64/libpython3.7m.so.1.0
#28 0x00007fc789595913 in ?? () from /usr/lib64/libpython3.7m.so.1.0
#29 0x00007fc78953a4f4 in ?? () from /usr/lib64/libpython3.7m.so.1.0
#30 0x00007fc78989cfab in start_thread (arg=<optimized out>) at
pthread_create.c:486
#31 0x00007fc7897cd81f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

As you can see the crasher is in python-cryptography, but still it is not
reproducible with older openssl.