{"record":{"id":"e8be110ae705b51e","repo":"gfx-rs/wgpu","slug":"wgpu-hal-ran-into-a-preventable-internal-error-t","errorCode":null,"errorMessage":"wgpu-hal ran into a preventable internal error: {txt}","messagePattern":"wgpu-hal ran into a preventable internal error: (.+?)","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"wgpu-hal/src/lib.rs","lineNumber":517,"sourceCode":"        gpu_allocator::AllocationSizes::new(\n            value.min_device_memblock_size,\n            value.min_host_memblock_size,\n        )\n        .with_max_device_memblock_size(value.max_device_memblock_size)\n        .with_max_host_memblock_size(value.max_host_memblock_size)\n    }\n}\n\n#[allow(dead_code, reason = \"may be unused on some platforms\")]\n#[cold]\nfn hal_usage_error<T: fmt::Display>(txt: T) -> ! {\n    panic!(\"wgpu-hal invariant was violated (usage error): {txt}\")\n}\n\n#[allow(dead_code, reason = \"may be unused on some platforms\")]\n#[cold]\nfn hal_internal_error<T: fmt::Display>(txt: T) -> ! {\n    panic!(\"wgpu-hal ran into a preventable internal error: {txt}\")\n}\n\n#[derive(Clone, Debug, Eq, PartialEq, Error)]\npub enum ShaderError {\n    #[error(\"Compilation failed: {0:?}\")]\n    Compilation(String),\n    #[error(transparent)]\n    Device(#[from] DeviceError),\n}\n\n#[derive(Clone, Debug, Eq, PartialEq, Error)]\npub enum PipelineError {\n    #[error(\"Linkage failed for stage {0:?}: {1}\")]\n    Linkage(wgt::ShaderStages, String),\n    #[error(\"Entry point for stage {0:?} is invalid\")]\n    EntryPoint(naga::ShaderStage),\n    #[error(transparent)]\n    Device(#[from] DeviceError),","sourceCodeStart":499,"sourceCodeEnd":535,"githubUrl":"https://github.com/gfx-rs/wgpu/blob/3e11ff59bf3f9795d285ecc045014089640d7248/wgpu-hal/src/lib.rs#L499-L535","documentation":"This panic is wgpu-hal's generic internal error hook for failures that are not invariant violations (usage errors) but still indicate a preventable problem inside a HAL backend implementation. It is raised via `hal_internal_error`, a cold `panic!` helper in wgpu-hal/src/lib.rs, meaning a backend hit an unexpected condition that upstream validation should normally have prevented. Because it is a panic (not a Result), it aborts the calling thread and indicates a wgpu bug or mis-wired backend rather than ordinary user error.","triggerScenarios":"Any wgpu-hal backend code path that calls `hal_internal_error(...)` when a backend-specific condition cannot be fulfilled at runtime (e.g. a device/adapter capability or surface configuration that the backend assumed valid but turns out not to be). It is the companion of `hal_usage_error` (invariant violations) and is never intentionally triggered by user API calls.","commonSituations":"Hitting a backend bug while using bleeding-edge or experimental features (ray tracing, etc.), running on a driver with unusual behavior, or using wgpu internals directly (e.g. writing a custom backend or bypassing wgpu-core validation). Also seen when a feature gate is missing so a capability check fails deep in the HAL.","solutions":["Reproduce with WGPU_BACKTRACE=1 to get a stack trace and file a wgpu issue with the message and backend/driver info","Check that required wgpu::Features are requested on the device before using the feature that panicked","Update wgpu to the latest version in case the backend bug is already fixed","If using wgpu-hal directly, add the missing validation/check that the invariant expects"],"exampleFix":"// before\nlet device = adapter.request_device(&desc, None)?; // desc.features = Features::empty()\nshader uses feature X -> hal_internal_error\n// after\nlet mut features = wgt::Features::empty();\nfeatures.insert(wgt::Features::EXPERIMENTAL_X);\nlet device = adapter.request_device(&DeviceDescriptor { features, ..Default::default() }, None)?;","handlingStrategy":"validation","validationCode":"if !device.features().contains(required_feature) {\n    panic/return Err(\"feature X not enabled for this device\");\n}","typeGuard":null,"tryCatchPattern":"std::panic::catch_unwind(|| device.create_render_pipeline(&desc))","preventionTips":["Request all required wgpu::Features on device creation","Keep wgpu updated to pick up backend fixes","Report panics with WGPU_BACKTRACE=1 output to the wgpu issue tracker"],"tags":["panic","internal-error","wgpu-hal","bug"],"backgroundTag":"hal-internal-panic","analyzedSha":"3e11ff59bf3f9795d285ecc045014089640d7248","analyzedAt":"2026-09-03T01:43:21.459Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-10T07:17:11.731Z"}