Hello @alexandru-calinoiu, this reads like you do not have a sane OpenGL driver install.
Please verify you have nvidia-dkms, nvidia-utils, and lib32-nvidia-utils installed and that they are all paired versions. The fact that steam is trying to use swrast means that your system is trying to use mesa's libGL.so with the nVidia proprietary driver, which is incompatible.
Apparently I did not had lib32-nvidia-utils installed and this triggered the failure. Fix was to simply install it.
That's no fix. Steam should report the lack of a needed tool instead of segfaulting with no explanation. Please reopen.
Please reopen, issue still persists.
Your system information
Please describe your issue in as much detail as possible:
When starting steam using the nvidia discret graphic card I get:
Steps for reproducing this issue:
Notes
I've tried the fix here https://github.com/ValveSoftware/steam-for-linux/issues/3863 with no luck