Hi. I started using tmux a few weeks ago, and every few days my session
was just disappearing without dropping a core file. I started it with
-v, and this is what `tail tmux-server-86369.log` says:

-----
keys are 1 (x)
)eys are 1 (
keys are 1 (e)
keys are 1 (x)
keys are 1 (i)
keys are 1 (t)
)eys are 1 (
writing 16 to client 5
got 15 from client 5
fatal: tty_start_tty: fcntl failed: Device not configured
-----

(I wasn't exiting tmux, just a window.) I don't see any other relavent
information in the log files.

So in lines 177-180 of tty.c there seems to be a race condition or
something with the tty that fcntl is trying to muck with, but I can't
reproduce the error at will (though it reproduces itself randomly) and
don't know enough about fcntl to offer more help.

As far as use cases go, I connect to it with urxvt on my laptop and
connectbot on my phone with `SSH_AUTH_SOCK=/home/hunner/.tmux-ssh-agent
TERM=xterm-256color tmux -v at`. Disconnects are done with a variety of
^Bd, closing the terminal, suspending my laptop, or losing a connection.
Nothing does it even remotely consistently.

Thanks for any help

;hunter

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