[BUG] Commands from proc section showing in the wrong position

[jaskij]

Describe the bug

I believe this is caused by the command itself containing a newline or something like that. You can see the two lines in the process section missing commands entirely.

This commands are ran inside an LXC container.

To Reproduce

I can describe my setup, but do not know which steps are crucial to reproduce. This stopped some time into the build though.

• host is Arch
• btop installed via the official package
• an LXC container with images:debian/bullseye
• running a Yocto build inside

Expected behavior

Commands properly showing in the process list.

Screenshots

Info (please complete the following information):

• btop++ version: 1.2.6
• Binary: from Arch repos
• Architecture: x86_64
• Platform: Linux
• (Linux) Kernel: 5.15.41-1-lts
• Terminal used: Terminator
• Font used: JetBrainsMono Nerd Font Regular

Additional context

$ cat btop.log 

2022/05/26 (20:31:21) | ===> btop++ v.1.2.6
2022/05/26 (20:31:21) | DEBUG: Starting in DEBUG mode!
2022/05/26 (20:31:21) | INFO: Logger set to DEBUG
2022/05/26 (20:31:21) | DEBUG: Setting LC_ALL=en_US.utf8
2022/05/26 (20:31:21) | INFO: Running on /dev/pts/4

GDB Backtrace

n/a

[aristocratos]

@jaskij Can't reproduce this with newlines or escape characters:

Any special characters looks to be already "unescaped" in /proc/[pid]/cmdline where the process command line is collected from.

So that shouldn't be the issue.

Can you try catching the output of /proc/[pid]/cmdline of that sh process when it's running?

[jaskij]

I will try, although it was quite ephemeral. Might be it was simply very long, but you probably handle that already. Maybe \t?

I'll try tomorrow.