Your system information

• Steam client version (build number or date): 1731433018
• Distribution (e.g. Ubuntu): NixOS
• Opted into Steam client beta?: [Yes/No] No
• Have you checked for system updates?: [Yes/No] Yes
• Steam Logs: steam-logs.tar.gz
• GPU: VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev e7)

Please describe your issue in as much detail as possible:

Steam checks for runtime updates, then logs in (spinner), then crashes before (or right when) the main window is supposed to open.

GDB says this about the segmentation fault:

Thread 45 "IPC:CSteamEngin" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xd9bffb40 (LWP 9551)]
0xdaae4f9d in ?? () from /home/user/.local/share/Steam/ubuntu12_32/steamclient.so
(gdb) 

full GDB output: https://gist.github.com/tu-maurice/acc2c80ede61be10cdf56493a9741dce

Steps for reproducing this issue:

1. Start
2. Login
3. Segfault