`with_winit` example panics when resizing on linux

[simonwuelker]

cargo run -p with_winit panics with the following backtrace when resizing the window. I'm on wayland, but the backtrace indicates the application ends up with x11.

Parsed svg Ghostscript_Tiger in 10.519153ms
Encoded svg Ghostscript_Tiger in 1.109533ms
[2026-08-03T03:48:37.554Z ERROR wgpu::backend::wgpu_core] Handling wgpu errors as fatal by default

thread 'main' (35767) panicked at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wgpu-29.0.3/src/backend/wgpu_core.rs:3879:18:
wgpu error: Validation Error

Caused by:
  In Surface::configure
    `SurfaceOutput` must be dropped before a new `Surface` is made


stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/31fca3adb283cc9dfd56b49cdee9a96eb9c96ffd/library/std/src/panicking.rs:689:5
   1: core::panicking::panic_fmt
             at /rustc/31fca3adb283cc9dfd56b49cdee9a96eb9c96ffd/library/core/src/panicking.rs:80:14
   2: wgpu::backend::wgpu_core::default_error_handler
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wgpu-29.0.3/src/backend/wgpu_core.rs:687:5
   3: wgpu::backend::wgpu_core::ErrorSinkRaw::handle_error_or_return_handler
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wgpu-29.0.3/src/backend/wgpu_core.rs:671:21
   4: wgpu::backend::wgpu_core::ContextWgpuCore::handle_error_inner
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wgpu-29.0.3/src/backend/wgpu_core.rs:299:18
   5: wgpu::backend::wgpu_core::ContextWgpuCore::handle_error_nolabel
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wgpu-29.0.3/src/backend/wgpu_core.rs:332:14
   6: <wgpu::backend::wgpu_core::CoreSurface as wgpu::dispatch::SurfaceInterface>::configure
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wgpu-29.0.3/src/backend/wgpu_core.rs:3879:18
   7: wgpu::api::surface::Surface::configure
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wgpu-29.0.3/src/api/surface.rs:96:20
   8: vello::util::RenderContext::configure_surface
             at ./vello/src/util.rs:140:25
   9: <with_winit::VelloApp as winit::application::ApplicationHandler<with_winit::UserEvent>>::window_event
             at ./examples/with_winit/src/lib.rs:638:38
  10: winit::event_loop::dispatch_event_for_app
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.13/src/event_loop.rs:642:56
  11: winit::event_loop::EventLoop<T>::run_app::{{closure}}
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.13/src/event_loop.rs:265:49
  12: core::ops::function::impls::<impl core::ops::function::FnMut<A> for &mut F>::call_mut
             at /home/alaska/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:298:21
  13: core::ops::function::impls::<impl core::ops::function::FnMut<A> for &mut F>::call_mut
             at /home/alaska/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:298:21
  14: winit::platform_impl::linux::x11::EventLoop<T>::single_iteration
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.13/src/platform_impl/linux/x11/mod.rs:564:17
  15: winit::platform_impl::linux::x11::EventLoop<T>::poll_events_with_timeout
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.13/src/platform_impl/linux/x11/mod.rs:505:14
  16: winit::platform_impl::linux::x11::EventLoop<T>::pump_events
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.13/src/platform_impl/linux/x11/mod.rs:424:18
  17: winit::platform_impl::linux::x11::EventLoop<T>::run_on_demand
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.13/src/platform_impl/linux/x11/mod.rs:385:24
  18: winit::platform_impl::linux::EventLoop<T>::run_on_demand
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.13/src/platform_impl/linux/mod.rs:820:61
  19: winit::platform_impl::linux::EventLoop<T>::run
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.13/src/platform_impl/linux/mod.rs:813:14
  20: winit::event_loop::EventLoop<T>::run_app
             at /home/alaska/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/winit-0.30.13/src/event_loop.rs:265:25
  21: with_winit::run
             at ./examples/with_winit/src/lib.rs:876:16
  22: with_winit::main
             at ./examples/with_winit/src/lib.rs:957:13
  23: with_winit_bin::main
             at ./examples/with_winit/src/main.rs:11:9
  24: core::ops::function::FnOnce::call_once
             at /home/alaska/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[DJMcNab]

Thanks for the report. I believe that this is a concern specific to our examples, and so while I'm keen to see a fix here, I don't know that we'll find time to dig into this ourselves.

[simonwuelker]

My application does run into the same issue, as I based it on the example. I'm not saying that anyone needs to spend time on this, but this is not a example-specific issue.

[DJMcNab]

I recognise that, but my point is mostly that you should be able to fix this in your own application directly, rather than needing a code change in the Vello library to fix it.

That is, concretely, our role is not to provide the canonical example of how to integrate wgpu and winit in a way which works on all platforms. I unfortunately don't have a great source for where a good version of that actually lives...