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I’m using split panes in tmux – one being vim, the other being a shell.  Sometimes, around once a day, vim freezes.  I can move between panes, perform any tmux commands, just vim doesn’t react to anything.  This happens only with tmux.  My only solution for now is to kill that pane and create a new one.

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    This has never happened to me, and I have used tmux+Vim in that way extensively. This does not mean it cannot happen to you — but it means you will have to try to more precisely locate when it happens to try to figure out why. Relevant information is what terminal you are using. One idea: you are not just accidentally hitting Ctrl+S in the Vim window? In that case: press Ctrl+Q to "unfreeze".
    – Daniel Andersson
    Feb 17, 2013 at 12:07
  • Just to clarify, I use Ubuntu 12.10, tmux, zsh and gnome terminal emulator. My tmux prefix is rebound to ctrl+s. If I hit prefix + ctrl+s, vim freezes. ctrl+q without prefix unfreezes it. It puzzles me why this doesn't happen in shell though.
    – Ondrej Slinták
    Feb 17, 2013 at 12:33
  • The same thing seems to happen to me when I save and press ^ z to put vim into the background too quickly afterwards.
    – gnucchi
    Jun 8, 2017 at 14:56

3 Answers 3

Reset to default
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You might have hit Ctrl+S, which turns off flow control in terminals and stops the terminal from accepting input. It is reenabled by pressing Ctrl+Q.

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    When you're just starting to use vim/terminal editors as your main editor, this is a very common problem. Later on, you'll end up having :wq spread throughout all your documents (or ZZ, I don't judge) and feel silly.
    – Rob
    Jul 29, 2013 at 15:14
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    Amazing how you correctly guessed the problem from such such a vague description. Thanks!
    – DBedrenko
    May 30, 2014 at 8:00
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    Holy ...! I've been having this issue for years, and never actually searched for a solution. This answer was the first solution I found, and it literally took me 3 seconds... All those hours wasted, and you had the solution just a couple of seconds away. I wish I could upvote you more (and downvote myself). Thanks!
    – simendsjo
    Oct 10, 2014 at 21:29
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    and if it happens to be twice unlucky (a remote tmux session with C-q as prefix): Type Cltr-q, then :, and enter in tmux: send-keys C-q!
    – Paschalis
    Apr 14, 2016 at 20:24
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    Wow!!!. You have opened my eyes. I had this issue for years and thought that the terminal hangs due to CPU/Memory resource issue. If I remote login, then I think it is a network issue. In all such occurrences, I just kill the terminal forcefully and start a new one.
    – RoboAlex
    Feb 4, 2019 at 8:19
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For me, this turned out to be a gpm problem. Run:

sudo service gym restart

See here for the related bug.

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My story involved following

alias doodle='(f=$(mktemp); vim $f; echo $f)' # alias to quick edit a new file with whatever name

Now that I use this alias diff -u $(doodle) $(doodle) vim said Vim: Warning: Output is not to a terminal. After that the terminal froze. Usual keys wouldn't help, e.g. Ctrl+Q, Ctrl-C, etc.

Pressing ZQ helped. It would exit the vim that you stuck in, but whos UI you can't see.

I guess vim needs some flag (not figured out yet which) to show itself on screen when being executed from bach mode.

I hope it helps someone.

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