Oh, test_ssl also crashed on Linux on the 3.10 branch, commit 0d399516320d8dfce4453037338659cef3a2adf4.

AMD64 Fedora Stable 3.10
https://buildbot.python.org/all/#/builders/659/builds/70

test.pythoninfo:

ssl.HAS_SNI: True
ssl.OPENSSL_VERSION: OpenSSL 1.1.1k  FIPS 25 Mar 2021
ssl.OPENSSL_VERSION_INFO: (1, 1, 1, 11, 15)
ssl.OP_ALL: 0x80000054
ssl.OP_NO_TLSv1_1: 0x10000000
ssl.SSLContext.maximum_version: TLSv1_3
ssl.SSLContext.minimum_version: TLSv1_2
ssl.SSLContext.options: OP_NO_COMPRESSION|OP_ENABLE_MIDDLEBOX_COMPAT|OP_CIPHER_SERVER_PREFERENCE|OP_NO_SSLv3|0x80000054
ssl.SSLContext.protocol: PROTOCOL_TLS_CLIENT
ssl.SSLContext.verify_mode: CERT_REQUIRED

Log:

(...)
test_sni_callback_wrong_return_type (test.test_ssl.ThreadedTests) ... ok
test_socketserver (test.test_ssl.ThreadedTests)
Using socketserver to create and manage SSL connections. ... ok
Fatal Python error: Segmentation fault

Current thread 0x00007f9de2d1f640 (most recent call first):
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/linecache.py", line 72 in checkcache
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/traceback.py", line 375 in extract
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/traceback.py", line 494 in __init__
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/traceback.py", line 132 in format_exception
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/test_ssl.py", line 262 in handle_error
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/test_ssl.py", line 2401 in wrap_conn
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/test_ssl.py", line 2444 in run
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/threading.py", line 1006 in _bootstrap_inner
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/threading.py", line 963 in _bootstrap

Thread 0x00007f9de0d1b640 (most recent call first):
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/threading.py", line 1102 in _wait_for_tstate_lock
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/threading.py", line 1086 in join
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/test_ssl.py", line 2604 in run
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/threading.py", line 1006 in _bootstrap_inner
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/threading.py", line 963 in _bootstrap

Thread 0x00007f9df0b5c740 (most recent call first):
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/threading.py", line 1102 in _wait_for_tstate_lock
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/threading.py", line 1086 in join
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/test_ssl.py", line 2583 in __exit__
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/test_ssl.py", line 3273 in test_ssl_cert_verify_error
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/unittest/case.py", line 549 in _callTestMethod
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/unittest/case.py", line 592 in run
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/unittest/case.py", line 652 in __call__
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/unittest/suite.py", line 122 in run
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/unittest/suite.py", line 84 in __call__
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/unittest/suite.py", line 122 in run
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/unittest/suite.py", line 84 in __call__
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/unittest/runner.py", line 176 in run
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/support/__init__.py", line 959 in _run_suite
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/support/__init__.py", line 1082 in run_unittest
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/test_ssl.py", line 5007 in test_main
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/libregrtest/runtest.py", line 246 in _runtest_inner2
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/libregrtest/runtest.py", line 282 in _runtest_inner
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/libregrtest/runtest.py", line 154 in _runtest
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/libregrtest/runtest.py", line 194 in runtest
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/libregrtest/main.py", line 321 in rerun_failed_tests
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/libregrtest/main.py", line 698 in _main
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/libregrtest/main.py", line 641 in main
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/libregrtest/main.py", line 719 in main
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/test/__main__.py", line 2 in <module>
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/runpy.py", line 86 in _run_code
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-x86_64/build/Lib/runpy.py", line 196 in _run_module_as_main

Extension modules: _testcapi (total: 1)
make: *** [Makefile:1256: buildbottest] Segmentation fault (core dumped)