They were both failing on master:
- test_dumbdbm was failing in a test case that writes out some data to a database,
  closes it, then reopens the db and expects to be able to read the data.
- test_memoryview expected some weakrefs to get cleared at the right time.

test_socket.py appears to "pass" -- it exits with code 0, but it spams a bunch of
error messages from other threads.