WebGPU adapter.info call fails after device creation

[matthew-wong1]

Hi! I wasn't too sure if this was a bug, but I got an unexpected error for this WebGPU program:

async function main() {
  const adapter = await navigator.gpu.requestAdapter();
  const device = adapter.requestDevice();
  console.log(adapter.info);
}
main()
  .then(() => {})
  .catch((error) => {
    console.log(error);
  });

When you run the program with:

DENO_WEBGPU_BACKEND=metal deno run --allow-read --unstable-webgpu --allow-write webgpu.js

It outputs this on both versions 1.46.3 and 2.0.0-rc.5:

TypeError: The adapter cannot be reused, as it has been invalidated by a device creation
    at GPUAdapter.get info (ext:deno_webgpu/01_webgpu.js:520:13)
    at main (file:///Users/test_case.js:14:22)

But this error doesn't show up if you replace the adapter.info call with any of other other adapter attributes such as:

adapter.limits
adapter.features
adapter.isFallbackAdapter

I was wondering if there was a specific reason only adapter.info would be disabled after requestDevice is called or if this might be some sort of bug. Thanks!

[crowlKats]

This was intended behaviour at one point, but it is not anymore from quickly looking at the spec, which is quite annoying, since there is no way to destroy a GPUAdapter manually, this allowed to get the info and then the device (wher ethe latter would destroy it under the hood), but since this changed now there wont be a way to destroy the adapter, which is not good since that will make tests difficult and have leaking resources. I will bring this up in next week's wgpu meeting to figure out whats up here.