[Bug]: CS2 is giving in dmesg an segfault error because of empty LD_LIBRARY_PATH

[Ecke]

User story

I would like to see that the LSGM configuration is filling automatically the LD_LIBRARY_PATH to the correct path.

Game

CS2 (CSGO)

Linux distro

Ubuntu 24.04, Ubuntu 22.04

Command

command: start

Further information

CS2 is giving the following error when it is starting the server: segfault at 0 ip 00007c1776e7a3f8 sp 00007ffd7d9ef0c0 error 6 in libtier0.so[7c1776d26000+37c000] likely on CPU 1 (core 1, socket 0)

This can be found in sudo dmesg

You can solve this to fill the variable: LD_LIBRARY_PATH
export LD_LIBRARY_PATH=/home/cs2server/serverfiles/game/bin/linuxsteamr

Workaround for now:
If you add this export to /home/cs2server/lgsm/config-lgsm/cs2server/cs2server.cfg (when you connect with SSH still the echo $LD_LIBRARY_PATH is then empty but for the server start it isn't).
Or you add Environment="LD_LIBRARY_PATH=/home/cs2server/serverfiles/game/bin/linuxsteamrt64” in the systemd unit file as a systemwide solution

If you done one of the above workarounds then the segfault error is solved.

My friend and I had the same issue with different hardware. Both we are using a VM in Proxmox. This issue is also to help others who might experiencing the same behaviour and don't understand why their server is not starting.

Relevant log output

segfault at 0 ip 00007c1776e7a3f8 sp 00007ffd7d9ef0c0 error 6 in libtier0.so[7c1776d26000+37c000] likely on CPU 1 (core 1, socket 0)

Steps to reproduce

1. Start the cs2server ./cs2server start
2. check the details ./cs2server details
3. sudo dmesg

[Ecke]

@borzaka I see your fix in the cs2.sh but and I still used my workaround in the cs2server configuration. Unfortunately the issue returned.

I have since Wed, 21 Jan 2026 22:33:56 +0000 again the following error in my cs2server configuration.

segfault at 0 ip 00007ca38368b850 sp 00007ffe1af77700 error 6 in libtier0.so[7ca383527000+381000] likely on CPU 1 (core 1, socket 0)

If I run ./cs2server debug I see this exit code:
[ ERROR ] Debugging cs2server: Server has stopped: exit code: 139

So does someone know what is causing now this error and how can I solve it?

Extra log info:
SteamGameServer_Init()
dlopen failed trying to load:
steamclient.so
with error:
steamclient.so: cannot open shared object file: No such file or directory
[S_API] SteamAPI_Init(): Loaded '/home/cs2server/.steam/sdk64/steamclient.so' OK. (First tried local 'steamclient.so')
[S_API] SteamAPI_Init(): No SteamClient023
FATAL ERROR: Failed to initialize Steamworks SDK for gameserver. No SteamClient023
0 FATAL ERROR: Failed to initialize Steamworks SDK for gameserver. No SteamClient023

./cs2.sh: line 109: 2069626 Segmentation fault (core dumped) ${STEAM_RUNTIME_PREFIX} ${GAME_DEBUGGER} "${GAMEROOT}"/${GAMEEXE} "$@"
[ ERROR ] Debugging cs2server: Server has stopped: exit code: 139
[ ERROR ] Debugging cs2server: Press ENTER to exit debug mode

[Ecke]

Ok with help of claude I fixed the server:

This solved my issue:
Initial error: libtier0.so segfault - caused by missing LD_LIBRARY_PATH
Second error: steamclient.so not found - library path didn't include Steam SDK
Third error: SteamClient023 version mismatch - outdated Steam SDK

The fix was likely a combination of:

Setting LD_LIBRARY_PATH in cs2.sh (so it persists when the server starts)
Updating SteamCMD to get the correct SteamClient023 version

The key issue was that your LD_LIBRARY_PATH export in the LinuxGSM config wasn't being picked up by the cs2.sh wrapper script, so we had to add it directly in the script itself.

So what have I done, in cs2.sh line 109 I added the LD_LIBARY_PATH in the else:
else
export LD_LIBRARY_PATH="${GAMEROOT}/bin/linuxsteamrt64:${GAMEROOT}/bin/linux64:${HOME}/.steam/sdk64:${HOME}/.steam/sdk32:${LD_LIBRARY_PATH}"
${STEAM_RUNTIME_PREFIX} ${GAME_DEBUGGER} "${GAMEROOT}"/${GAMEEXE} "$@"
fi
STATUS=$?

And I fixed my steamfiles with the following command:
cd ~/.local/share/Steam/steamcmd/
./steamcmd.sh +quit

Also I made new symlinks but I am not sure if that is really needed.

[Ecke]

Solution that worked for me

The segfault was resolved by ensuring the Steam SDK paths are in LD_LIBRARY_PATH.

Fix Applied

Modified /home/cs2server/serverfiles/game/cs2.sh (around line 106-110):

export LD_LIBRARY_PATH="${GAMEROOT}/bin/linuxsteamrt64:${GAMEROOT}/bin/linux64:${HOME}/.steam/sdk64:${HOME}/.steam/sdk32:${LD_LIBRARY_PATH}"

Additional Steps

1. Updated SteamCMD: ~/.local/share/Steam/steamcmd/steamcmd.sh +quit
2. Ensured Steam SDK symlinks exist: ln -sf ~/.local/share/Steam/steamcmd/linux64/steamclient.so ~/.steam/sdk64/steamclient.so

Environment

• LinuxGSM version: v25.2.0
• CS2 build: 21669343
• Date fixed: January 28, 2026

This resolves both the libtier0.so segfault and the SteamClient023 errors.

[borzaka]

Well, I'm not sure what issue you're experiencing. I haven't encountered anything like that on my side. It works properly on my Debian 12 bare-metal setup.

I've run multiple events using this setup without any of the technical issues mentioned above.

The main goal of the LGSM project is to avoid the need for such workarounds in order to make things work. I'd suggest trying a clean install using LGSM.

At the very least, try running a file verification, as it's possible that cs2.sh has been modified beyond repair.