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The WebGPU spec. `createBindGroup` [states][spec-ref] (emphasis mine): > Device timeline initialization steps: > > … > > 2. If any of the following conditions are unsatisfied generate a > validation error, invalidate _bindGroup_ and return. > > … > > For each `GPUBindGroupEntry` _bindingDescriptor_ in > _descriptor_.`entries`: > > - … > > - If the defined binding member for _layoutBinding_ is: > > - … > > - `buffer` > > - … > > - If _layoutBinding_.`buffer`.`type` is > > - … > > - `"storage"` or `"read-only-storage"` > > - … > > - effective buffer binding size(_bufferBinding_) is a multiple of 4. [spec-ref]: https://www.w3.org/TR/webgpu/#dom-gpudevice-createbindgroup We were not implementing this check of effective buffer binding size. Check that it's a multiple of 4, including `webgpu:api,validation,createBindGroup:buffer,effective_buffer_binding_size:*` that this is now implemented as intended.