sudo find / -size +5G -ls
listed debug files with more than 8GB size at /sys/kernel/debug/dri/n/amdgpu_vram
(n is the number of GPUs)
These might be useless debug files. Cannot delete them (error "Operation not permited"). How to delete these files?
2 Answers
These are not files in the traditional sense.
The entire /sys filesystem is a virtual file system, which maps various system functions as files. They are not stored on disk; they're merely mechanisms to access various kernel functions. In this case, the file is the video RAM. The files can serve as a debugging interface, thus the naming.
Removing them does literally not make sense - as they're an representation of a physical feature of your computer system. That's why you're not allowed to remove them.
In short: Do not touch anything inside /sys or /proc unless you know what you are doing. You may crash your system. Reading them is generally safe - worst case will typically garble your terminal with random data.
There's lots of interesting stuff in /sys and /proc, that can tell you a whole lot about how your system operates, both the Linux kernel, and physical parts of your computer.
I have the same problem.
df -Th
command shows 100% Usage on / . Therefore, it is not imaginary problem. It is what did happen in my rig before, too. I solved it by using commands like
sudo apt autoremove
sudo apt autoclean
sudo apt clean
sudo apt autoremove --purge
sudo rm /var/log/kern.log
touch /forcefsck
sudo shutdown -rF now
If I find the full solution, I will post it here. ncdu is a better application for checking disk space usage in command line.
apt install ncdu
After several reboot and using commands like above and
sudo lsof +L1 | grep deleted
to detect processes which hold deleted files, the problem solved.
