BTW The test gdb also crashes in the same way:

test test_gdb crashed -- Traceback (most recent call last):
  File "/builddir/build/BUILD/Python-3.9.0a6/Lib/test/libregrtest/runtest.py", line 270, in _runtest_inner
    refleak = _runtest_inner2(ns, test_name)
  File "/builddir/build/BUILD/Python-3.9.0a6/Lib/test/libregrtest/runtest.py", line 221, in _runtest_inner2
    the_module = importlib.import_module(abstest)
  File "/builddir/build/BUILD/Python-3.9.0a6/Lib/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 790, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "/builddir/build/BUILD/Python-3.9.0a6/Lib/test/test_gdb.py", line 41, in <module>
    gdb_version, gdb_major_version, gdb_minor_version = get_gdb_version()
  File "/builddir/build/BUILD/Python-3.9.0a6/Lib/test/test_gdb.py", line 38, in get_gdb_version
    raise Exception("unable to parse GDB version: %r" % version)
Exception: unable to parse GDB version: ''

1 test failed again:
    test_gdb