mc freezes for 10 seconds, after which it opens with an empty PS1 (mc, tmux).

[mc-butler]

Important

This issue was migrated from Trac:

Origin	https://midnight-commander.org/ticket/4568
Reporter	krekhov (@iikrllx)
Keywords	mc, tmux, subshell, freeze

I discovered strange behavior of mc after exiting the tmux session. I checked this bug on Manjaro and Debian, package versions are listed below. The point is that mc freezes for 10 seconds when opened, then opens without PS1, only the '$' symbol is visible in the mc prompt and if return to tmux, in session 0 you can see the 'Bad file descriptor' errors (see 'b.png' screenshot).

--- Actions

-> install mc and tmux latest versions

$ sudo useradd -m -s /bin/bash tester
$ sudo passwd tester
$ sudo echo "[ -z \"\$TMUX\" ] && tmux" >> /home/tester/.bashrc
$ su tester
$ mc

mc opens well, PS1 is present.

-> exit from mc
-> exit from tmux

$ mc

or

$ mc -U

10 seconds wait, then PS1 will be empty. I expected that mc would open immediately and PS1 would be present there (see 'a.png' screenshot).

$ sudo mc

mc opens well, PS1 is present.

$ mc -u

mc opens well, PS1 is empty (that's how it should be, because '--nosubshell')

-> exit from mc

$ tmux

-> ctrl + b + s
-> select session 0 from the list
-> there will be errors (see 'b.png' screenshot)

--- Versions
-- Manjaro

$ lsb_release -a

LSB Version: n/a
Distributor ID: Manjaro
Description: Manjaro Linux
Release: 24.0.6
Codename: Wynsdey

$ pacman -Qi mc

Version : 4.8.31-3
Description : A file manager that emulates Norton Commander
Architecture : x86_64
...

$ pacman -Qi tmux

Name : tmux
Version : 3.4-10
Description : Terminal multiplexer
Architecture : x86_64
...

-- Debian

$ lsb_release -a

No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 12 (bookworm)
Release: 12
Codename: bookworm

$ dpkg -l | grep -E 'tmux|mc'

ii mc 3:4.8.31-1 amd64 Midnight Commander - a powerful file manager
ii mc-data 3:4.8.31-1 all Midnight Commander - a powerful file manager -- data files
ii tmux 3.4-7 amd64 terminal multiplexer

Note

Original attachments:

• a.png (raw) by krekhov (@iikrllx) on Aug 9, 2024 at 15:41 UTC
• b.png (raw) by krekhov (@iikrllx) on Aug 9, 2024 at 15:41 UTC

[mc-butler]

Changed by krekhov (@iikrllx) on Aug 9, 2024 at 15:41 UTC

• Attachment a.png (raw) added

[mc-butler]

Changed by krekhov (@iikrllx) on Aug 9, 2024 at 15:41 UTC

• Attachment b.png (raw) added