+1 same issue on Fedora 38 using rpm package from rpmfusion.

Adding -vgui as suggested by LRitzdorf does allow steam to launch in the old ui but as noted there is various features unavailable.

Indeed, on ArchLinux for the last two days, I observe that I can't launch the GUI: no matter what I do, the GUI just won't appear. And, as mentioned above, the -vgui works fine.

...okay, I hate to be this guy, but the issue has resolved itself for me. It seems to have been helped by removing ~/.cache/nvidia/GLCache and ~/.local/share/vulkan/implicit_layer.d/steam*.json, though I have no idea why either of those would affect the web helper.

Also, @fontivan and @vityafx: note that there are several other issues with the Steam Web Helper, so unless you can see it crashing with the same out-of-memory error, don't assume that this specifically is your issue — try looking at some of the other Web Helper posts here, and maybe try their suggested solutions (if any).

@LRitzdorf I had exactly the same steamwebhelper.log crashes with the constant loop.
However I can confirm that deleting ~/.cache/nvidia/GLCache immediately fixes my client.

I did recently update my nvidia driver to 535 which could be related? Though client has been a bit troublesome since the new UI update so I am not sure.

Okay, good, just wanted to make sure you hadn't been drawn here by the fact that this was a recently-created issue.

The weird thing about this issue for me is that it appeared when I wiped and remade the disk partition containing my home directory. Nothing outside of /home/me was touched, and system packages stayed the same. This makes it even stranger that clearing the GL cache would help — those files had to have been very recently created by Steam anyway. (Then again, I know very little about the inner workings of the Steam client, so I'm just glad to have found a solution).

Nvidia Driver version: 535.54.03 CUDA Version: 12.2

Confirming that removing ~/.cache/nvidia/GLCache also fixed the issue for me on fedora 38. Also confirm that -vgui launched, but that way there be dragons, lol

I had this issue after a fresh install. I reinstalled Linux Mint and all my apps (including Steam), before realising I was still using the Nouveau graphics drivers instead of the proprietary NVIDIA ones. I switched to the latest (v535) and restarted my machine; upon reboot Steam stopped working as above. It would appear as an icon in the tray, but clicking any menu items like Library or Store didn't work. I uninstalled Steam completely and reinstalled it to no avail. Running steam via command line printed strange messages over and over in an infinite loop:

partially disabling sandbox until CEF supports clone3()
Runtime for steamwebhelper: defaulting to [PATH]

Following advice, I went to ~/.cache/nvidia/GLCache and renamed all the GUID folders to have an underscore _ (just in case). As soon as I renamed the last folder, suddenly all the folders disappeared, and Steam appeared out of nowhere. It now seems to work completely fine. Another thing to note is I was previously using this exact configuration and drivers before reinstalling Linux, which might give credit to the "changing drivers broke something" theory.

Hopefully this helps debug the issue - I can provide logs if requested.

Wild, removing ~/.cache/nvidia/GLCache works. Reboot... and still works.

Nvidia rtx2060; openSUSE Leap 15.5; drivers version: 535.54.03.

Nvidia driver version 535.86.05 that was just released fixes the issue for me.