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46 lines
2 KiB
Markdown
46 lines
2 KiB
Markdown
---
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weight: 50
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title: Easy Anti-Cheat
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---
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# Easy Anti-Cheat
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Sometimes, seemingly randomly, you can get an EAC error during the VRChat startup/login screen. It looks like a message box, with the title "Anti-cheat Error", no actual message text, and a single button labeled "Quit".
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## Recommended Workaround
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Wrapper script for starting VRChat: [startvrc.sh on GitHub](https://gist.github.com/galister/ca63a5795694e4c839a8e7f4bb8a35bc)
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Set startup options for VRChat:
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`/path/to/startvrc.sh %command%`
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If you're using extra env vars, they should go first:
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`PRESSURE_VESSEL_FILESYSTEMS_RW=/run/user/1000/monado_comp_ipc /path/to/startvrc.sh %command%`
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## Root Cause
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We are still trying to determine the cause.
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It is likely caused by a race condition. Closing unnecessary apps or otherwise **lowering your CPU usage** before starting VRChat seems to make the EAC error happen significantly less often. It is safe to crank the CPU usage back up after the home world has loaded.
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The following sections do not fix the issue, but are still kept on the wiki to dispel rumors and record research.
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## (Outdated) glibc dt_gnu_hash
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Previously, we believed it to be related to an incompatible glibc version. However, upon further testing, this turned out to be insufficient.
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In other games with EAC, getting past the EAC splash screen had required glibc to be built with a specific flag to work.<sup>[1],[2]</sup> (`--hash-style=both`)
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[1]: https://github.com/ValveSoftware/Proton/issues/6051
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[2]: https://www.phoronix.com/news/Glibc-2.36-EAC-Problems
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Flatpak Steam includes this flag, however Flatpak Steam is not recommended for VR.
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As of 2024-02-09, Arch Linux no longer ships with this flag.
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- Arch users could use this EAC-specific glibc from the AUR: https://aur.archlinux.org/packages/glibc-eac
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- Gentoo users could enable the fix using the `hash-sysv-compat` USE flag on `sys-libs/glibc`.
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To reiterate, this glibc flag does _not_ appear to fix VRChat's particular flavor of EAC failures.
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