[Bug]: Panic related to GetHiddenAreaMesh

[mitsuami-megane]

Operating System

Gentoo

OpenXR Runtime

WiVRn 26.2

Describe the issue.

This keeps popping up every now and again for me.

The panic happens right when the game starts, around the time when I would expect to start seeing images from the game's loading screen in VR.

It is is quite rare and seems mostly random. I'm not sure when I saw the first one, but it was likely before 0.4.0 even.

[2026-02-11T14:38:50.675 DEBUG xrizer::clientcore ThreadId(1)] app asking about interface: "IVRSystem_022"
[2026-02-11T14:38:50.675 DEBUG xrizer::clientcore ThreadId(1)] requested interface "IVRSystem_022"
[2026-02-11T14:38:50.675 DEBUG xrizer::clientcore ThreadId(1)] requested interface "IVRCompositor_028"
[2026-02-11T14:38:50.675 DEBUG xrizer::clientcore ThreadId(1)] requested interface "IVROverlay_027"
[2026-02-11T14:38:50.688 DEBUG xrizer::clientcore ThreadId(1)] requested interface "IVRSystem_022"
[2026-02-11T14:38:50.688 DEBUG xrizer::system ThreadId(2)] GetHiddenAreaMesh: area mesh type: Standard
[2026-02-11T14:38:50.688 ERROR xrizer ThreadId(2)] panicked at src/system.rs:75:14:
Couldn't locate views: ERROR_RUNTIME_FAILURE
[2026-02-11T14:38:50.688 ERROR xrizer ThreadId(2)] Backtrace:
   0: xrizer::init_logging::{{closure}}::{{closure}}
   1: std::panicking::panic_with_hook
   2: std::panicking::panic_handler::{{closure}}
   3: std::sys::backtrace::__rust_end_short_backtrace
   4: __rustc::rust_begin_unwind
   5: core::panicking::panic_fmt
   6: core::result::unwrap_failed
   7: xrizer::system::ViewCache::get_views_view_space
   8: xrizer::system::ViewCache::get_views
   9: xrizer::system::System::get_views
  10: <xrizer::system::System as openvr::bindings::vr::IVRSystem023_Interface>::GetProjectionRaw
  11: <xrizer::system::System as openvr::bindings::vr::IVRSystem023_Interface>::GetHiddenAreaMesh
  12: openvr::bindings::vr::ivrsystem022::GetHiddenAreaMesh
  13: IVRSystem_IVRSystem_022_GetHiddenAreaMesh
  14: __wine_unix_call_dispatcher
  15: start_thread
  16: <unknown>
  17: clone

Steps to reproduce

Launch VRChat

Please confirm you have reproduced this on the latest commit.

• I have reproduced this on the latest commit

[ImSapphire]

Did this start happening with WiVRn v26.2 (more specifically since the prediction-pacing merge) or has this been an ongoing issue?

[mitsuami-megane]

I've been seeing these for a very long time. Probably 6+ months. However it's been quite rare, and just trying to start the game again always seems to fix it, so I didn't think too much of it.

[ImSapphire]

I believe this is fixed in WiVRn master branch, but #311 may also prevent the error.