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Crash on latest version #994
Description
tmux 3.6 and tmuxp 1.57 on Ubuntu 24.04 (I use pixi package manager to install). I get this crash which I didn't have before. Happens on multiple systems. Reverting to old versions (system versions from Ubuntu, tmux 3.4 and tmuxp 1.38) and don't see the crash.
Traceback (most recent call last):
File "/home/cagelab/.pixi/envs/tmuxp/bin/tmuxp", line 9, in <module>
sys.exit(cli.cli())
~~~~~~~^^
File "/home/cagelab/.pixi/envs/tmuxp/lib/python3.14/site-packages/tmuxp/cli/__init__.py", line 148, in cli
command_load(
~~~~~~~~~~~~^
args=CLILoadNamespace(**vars(args)),
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
parser=parser,
^^^^^^^^^^^^^^
)
^
File "/home/cagelab/.pixi/envs/tmuxp/lib/python3.14/site-packages/tmuxp/cli/load.py", line 583, in command_load
load_workspace(
~~~~~~~~~~~~~~^
workspace_file,
^^^^^^^^^^^^^^^
...<2 lines>...
**tmux_options,
^^^^^^^^^^^^^^^
)
^
File "/home/cagelab/.pixi/envs/tmuxp/lib/python3.14/site-packages/tmuxp/cli/load.py", line 357, in load_workspace
_reattach(builder)
~~~~~~~~~^^^^^^^^^
File "/home/cagelab/.pixi/envs/tmuxp/lib/python3.14/site-packages/tmuxp/cli/load.py", line 129, in _reattach
builder.session.attach_session()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/home/cagelab/.pixi/envs/tmuxp/lib/python3.14/site-packages/libtmux/session.py", line 827, in attach_session
raise exc.LibTmuxException(proc.stderr)
libtmux.exc.LibTmuxException: ['open terminal failed: not a terminal']
Reacted by bibek-shah-butterfly
Activity
0re5ama commentedon Nov 30, 2025
I am facing the same issue. I tried running tmux and I am getting the error:
open terminal failed: not a terminal. I think it has got something to do withncursesupdate.tony commentedon Nov 30, 2025
Does tmux 3.5 work?
I will take a closer look at 3.6 today.
tony commentedon Nov 30, 2025
@0re5ama @iandol Does just typing
tmuxby itself work?I'm getting
not a terminaleven when I runtmuxon 3.6.tony commentedon Nov 30, 2025
@iandol @0re5ama
Does it work if you fully close tmux and try again? (e.g.
killall -9 tmux/killall -9 /usr/local/bin/tmux/killall -9 /usr/bin/tmux?)That fixed it for me.
From tmux/tmux#4699:
tony commentedon Nov 30, 2025
Moving this to a discussion - this looks tmux 3.6 related and I think we have a workaround