test_dev's first block checked for agent.sock without having completed a
round-trip, so nothing put the check after the bind. merged_setup binds the
dev socket and returns; the main thread calls agent/start only after that, and
a connect lands in the backlog because merged_serve does not accept until it
has seen agent.sock itself. 2 runs in 8 failed.
Moving the describe up in front of the check supplies the ordering: a reply
arriving means merged_serve is past its own await, so it has already observed
the path. That closes the second race too — unlinking before merged_serve
looked made it wait out its full ten seconds and warn, which is the ten
seconds separating the passing runs from the failing ones.
0 in 10 after, and every run in the fast band.
Joseph Ferano
f80a7a98e7