Voice chat breaks after unloading a workshop map.

[DarkRTA]

Description

When playing a workshop map in CS2, voice chat will break after returning to the main menu and loading an official map, requiring a game restart in order to fix. This seems to be caused by the resource system getting confused and being unable to reload sounds/servervoice.vsnd_c

Steps to reproduce.

• Load any workshop map offline.
• Type voice_loopback true into the console.
• Try speaking, you should hear yourself.
• Load any official map offline.
• Type voice_loopback true into the console.
• Try speaking, you will not hear yourself this time and will see the game failing to load sounds/servervoice.vsnd_c in the console.

System information

This bug has been confirmed to occur on Windows clients although I am testing on a NixOS machine.

Processor Information:
CPU Vendor: AuthenticAMD
CPU Brand: AMD Ryzen 5 3600 6-Core Processor

Operating System Version:
"NixOS 25.05 (Warbler)" (64 bit)
Kernel Name: Linux
Kernel Version: 6.6.71

Video Card:
Driver: AMD AMD Radeon RX 7600 XT (radeonsi, navi33, LLVM 19.1.5, DRM 3.54, 6.6.71)
Driver Version: 4.6 (Compatibility Profile) Mesa 24.3.3

Memory:
RAM: 15915 Mb

[DarkRTA]

This is caused by the game purging all sounds whenever all workshop addons are unloaded.

Since servervoice.vsnd_c seems to be created by the voice system on init and not loaded from a file, the voice system ends up being unable to find it whenever it goes to play back any voice chat.

Patching libsoundsystem.so to not unload sounds on addon unmount (requires -insecure) avoids this bug entirely.

[EngineServiceManager] Unmounting addon '3075706807'
[SoundSystem] Addon unloaded, unloading sound resources. <--- bug occurs here

// later when the game needs to play voice chat
[ResourceSystem] Failed loading resource "sounds/servervoice.vsnd_c" (ERROR_FILEOPEN: File not found)

[thouravi]

Can confirm, this issue also exists in Windows. @kisak-valve

[danginsburg]

Thanks for the excellent bug report! We are working on a fix.