Reproduce with `./bzr selftest --subunit -s bt.test_trace mutter_never_fails` or remove --subunit to see the underlying error. Note also --parallel=fork doesn't break while --parallel=subprocess does so this is a real regression due to moving the stream wrapping around.
Reproduce with `./bzr selftest --subunit -s bt.test_trace mutter_never_fails` or remove --subunit to see the underlying error. Note also --parallel=fork doesn't break while --parallel= subprocess does so this is a real regression due to moving the stream wrapping around.