Help wanted: tmux print control chars after startup

Issue description

As title said, tmux would print ^[[>0;10;1c; after startup.

it can be reproduced without user-defined .tmux.conf, just start tmux and exit, and do these action for several times, the string will be printed. How to eliminate them?

Required information

Please provide the following information:

tmux 3.2a with Z-Shell 5.8
openSUSE Tumbleweed 20210817 in virtual box, connected from windows by SSH for windows 8.1p1
xterm-256color
how to upload the logs?

Is this printed inside or outside tmux? Please attach the logs to this issue:

No, it appeared after tmux startup only. Logs are following, I just exit tmux after it started:

tmux-server-12191.log
tmux-out-12191.log
tmux-client-12189.log

How did you attach this log? Did you give it time to upload? It doesn't work:

$ ftp https://github.com/tmux/tmux/files/7030615/tmux-server-12191.log
Trying 140.82.121.4...
Requesting https://github.com/tmux/tmux/files/7030615/tmux-server-12191.log
ftp: Error retrieving https://github.com/tmux/tmux/files/7030615/tmux-server-12191.log: 404 Not Found

I dragged and dropped them in writing box. it might be my network issue. Could you access them this time?

tmux-client-12189.log
tmux-out-12191.log
tmux-server-12191.log

If you start and detach tmux fast enough and your terminal is slow enough to respond, then the device query string tmux asked for will end up on the terminal. Is that what you are doing?

I cannot get the point. how much the time is fast enough to start and detach tmux?
these chars would appear even if I do other operations instead of exiting it.

If you do this outside tmux, what do you see:

printf '\033[>c\033[>q';cat

I got this, and this string will be printed when I input <CR>.

The problem is that tmux is asking for this sequence to be sent once but your terminal is sending it twice. Does this still happen if you use a different terminal?

Can you run tmux like this:

strace -ttfostrace.out tmux -f/dev/null -Ltest new

Then reproduce and show me the strace.out file.

Actually add -vv as well:

strace -vvttfostrace.out tmux -f/dev/null -Ltest new

I have tried bash(5.1.8) and sh(5.1), and this problem appeared.
strace.zip

bash and sh are not terminals, they are shells. Try a different terminal like putty.

got it, I have tried in windows terminal and MobaXterm, this problem appeared.

Do you still see it if you run tmux -f/dev/null -Ltest new -- cat so tmux runs cat instead of your shell?

sorry for replying late.
I have tried in PuTTY, the string was not printed on screen.
And I configured .tmux.conf to disable the status bar, the string was not printed neither.

But I don't want to disable status bar, because I need it to manager windows in tmux, any suggestions?

hmmm... Test with windows terminal.
Status bar disabled seems not resolve this issue completely, but the probability seems decreased.

Can you reproduce without status line and with -vv and show me the tmux log files? For example do:

rm tmux*.log
tmux -Ltest kill-server
tmux -Ltest -vvf/dev/null set -g status off \; new

This is almost certainly a terminal bug so if we narrow it down we may be able to work around it but we won't be able to fix it in tmux.

tmux-log.zip

OK, I will push an issue to windows terminal if it's a terminal bug.

I cannot download this latest zip file, are you sure you uploaded it correctly?

tmux-log.zip
could you re-open this issue? I am sorry for forgetting it.

I have pushed the issue to windows terminal as #11204

@Stark-Zhang

From tmux manual:

     escape-time time
             Set the time in milliseconds for which tmux waits after an escape is input to determine if it is part of
             a function or meta key sequences.  The default is 500 milliseconds.

@Stark-Zhang what happen if you add "set -sg escape-time 10" to your .tmux.conf to increase the time from the default 500ms?

@Stark-Zhang is this happening when connecting to a remote system or only to the local VM. I can't install Virtualbox due to being mutually exclusive with WSL2 running on my local machine. I could not reproduce when launching tmux on a remote system.

I don't know, this seems like it is definitely a terminal bug. This is what tmux is sending up to the point it receives the doubled DA response, out.txt. But it contains nothing unusual and we have tried removing the most obvious stuff, it is not consistent. This needs someone to see what the terminal actually thinks it is sending.

yes, let's take a look what responded from developers of Windows Terminal.

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

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Help wanted: tmux print control chars after startup #2844

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nicm commented on Aug 23, 2021

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nicm commented on Aug 24, 2021

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nicm commented on Aug 24, 2021

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