Steam client won't stay open. The tray icon runs fine (I can use it to quit Steam), but the main library/store window never opens or stays open. steamwebhelper crashes and restarts in a loop, confirmed via cef_log.txt showing startcount incrementing every ~10 seconds. Big Picture mode also crashes immediately.

Confirmed via coredumpctl: steamwebhelper crashes with SIGSEGV, with the crash occurring inside libcef.so specifically (the same crash address is repeated across the entire stack trace, suggesting a stack overflow/infinite recursion inside CEF).

This happens identically across two completely separate install methods:

1. Native Steam (.deb via apt)
2. Fresh Flatpak install of com.valvesoftware.Steam

Both show the same SIGSEGV crash in libcef.so.

Things already tried, none of which fixed it:

• Reinstalled all Steam packages and dependencies
• Launched with --no-sandbox
• Forced software rendering (LIBGL_ALWAYS_SOFTWARE=1) and disabled GPU compositing (--disable-gpu --disable-gpu-compositing)
• Tried multiple desktop themes (Mint-Y, Adwaita, Mint L)
• Tried GLIBC_TUNABLES=glibc.rtld.optional_static_tls=4096
• Full clean reinstall (wiped ~/.steam and ~/.local/share/Steam)
• Checked AppArmor (aa-status), nothing blocking
• Confirmed plenty of free disk space

System info:

• Linux Mint 22.3, Cinnamon desktop
• Kernel: 7.0.0-28-generic
• CPU: Intel Core i3-12100F
• GPU: AMD Radeon RX 5700 XT (RADV NAVI10, Mesa 25.2.8)
• RAM: 16GB
• Steam build ID: 1785799196

Since this crashes identically on two separate install methods with different bundled libraries, this seems like a real bug rather than a local config issue. Happy to provide any additional logs or test any suggested fixes.