Name of the game: War Thunder
Steam AppID: 236390

GPU: NVIDIA GeForce RTX 3080
Video driver version: nvidia 595.58.03
Kernel version: 6.19.10-1-cachyos
Link to full system information: (wklej z Steam → Help → System Information do Gist)
Proton version: Proton Experimental

I confirm:

• that I haven't found an existing compatibility report for this game.
• that I have checked whether there are updates for my system available.

Symptoms:
Fatal crash when entering any battle or test flight. FATAL ERROR dialog shows (libev) select, err=10045. Wine log (steam-236390.log) shows RPC_S_SERVER_UNAVAILABLE. Game works correctly
in hangar and menus. BattlEye is active.

Reproduction:

1. Launch War Thunder via Proton Experimental
2. Enter any battle or test flight
3. Game crashes immediately with FATAL ERROR: (libev) select, err=10045

Notes:

• PROTON_NO_ESYNC=1 PROTON_NO_FSYNC=1 PROTON_NO_NTSYNC=1 do not resolve the issue
• Firewall disabled — no change
• Proton prefix rebuilt from scratch — no change
• Issue appeared after nvidia driver update 595.45.04 → 595.58.03 (2026-03-24)
• Also reproducible on GE-Proton10-34

steam-236390.log