I wrote:
FWIW, I've tried all communication styles this morning, and none of them work. :SPAWN hangs, and the other ones lead to the exact same error as with :SIGIO (the one I used without even knowing it as it is the default).
Now I've bisected some recent commits, and I found the culprit. Before this one, everything works fine.
commit 2e7f94633acebd5cf4074ce9601b021624ad8233 Author: Stas Boukarev stassats@gmail.com Date: Thu Jan 11 15:29:00 2018 +0300
More energy efficient auto-flush-loop.
Don't spin until there's something to flush.