Tmux freezes Mac when killing a long running session

[dphaener]

I have found that when I have a local tmux session running for more than 2-3 hours, and I kill it, my Mac (Running OS X El Capitan GM Candidate) freezes completely.

Running Tmux 2.0 Stable in Terminal.app (it also happens when using iTerm).

Additionally, Vim and Terminal apps start becoming sluggish and unresponsive after a session is open for a day or two. I wouldn't mind that too much if I could just kill the session and start it back up again. :)

[nicm]

There is no way the freezing is a tmux problem, userspace programs shouldn't be able to do this. Either you are hitting a kernel bug or your hardware is dodgy.

What kind of memory usage is tmux hitting after a day or so? Have you got some ridiculously huge history-limit set?

[dphaener]

I'm using the default history-limit (2000). I've heard of a possible kernel bug, but the description I saw didn't look like the same issue I was having.

I'll keep an eye on the memory usage today (just started a new session about 30 minutes ago) and see if that gives us any more information.

[pengux]

I have the same problem. tmux doesn't have high memory usage when this happens. I also have the Activity Monitor open when I close tmux to see if anything suspicious is happening but couldn't find anything off. I ran tmux -vvvv to have logs but the logs doesn't show any errors either. But the problem is very much reproducible, it happens everytime.

[nicm]

The freezing? Well, does it happen when you send SIGKILL to tmux? Or on SIGTERM? Or only when you exit all the panes? Does it happen with no .tmux.conf at all? Does it happen on older OS X versions?

[dphaener]

@nicm I have just confirmed that killing it via SIGKILL causes a system freeze.

[nicm]

You need to go and talk to Apple about this.

-------- Original message --------
From: Darin Haener notifications@github.com
Date:15/09/2015 19:25 (GMT+00:00)
To: tmux/tmux tmux@noreply.github.com
Cc: Nicholas Marriott nicholas.marriott@gmail.com
Subject: Re: [tmux] Tmux freezes Mac when killing a long running session
(#108)

@nicm I have just confirmed that killing it via SIGKILL causes a system freeze.

—
Reply to this email directly or view it on GitHub.

[dphaener]

Thought that might be the case.......Unfortunately.

[paulrouget]

@dphaener do you need to wait 2 hours before this happens? It happens to me imediatly: boot osx 10.11, starts tmux, quit tmux, spinning wheel.

[dphaener]

@paulrouget Yes that's correct. I haven't nailed down an exact time, but the session has to be open for some time before this behavior occurs.

[dphaener]

@paulrouget Update: Restarting OSX 10.11, opening a tmux session, killing session. This did not cause a full freeze. I then opened a new session. About 10 minutes later, the system began to become unresponsive, slowly. First tmux windows froze, then other programs started to become unresponsive, eventually requiring a full reboot.

[pengux]

Actually the problem also occur with SIGTERM, not just SIGKILL. And I've ran tmux without any .tmux.conf too and still the same. As @dphaener reported, it doesn't happens right away, but tmux needs to be open for a while before it starts to slows down and become unresponsive.

[zacharyvoase]

I can +1 this. Has anyone filed a Radar yet, or should I? It's unfortunate that it brings the system to a halt but force-rebooting my Mac doesn't cause it to be recognized as a crash, so I don't get any traces/logs.

[paulrouget]

Has anyone filed a Radar yet, or should I?

Please do.

[zxcvbn97]

+1 Same problem here