{"record":{"id":"87d063e3d714cade","repo":"gfx-rs/wgpu","slug":"mismatched-pop-error-scope-call-no-error-scope-fo","errorCode":null,"errorMessage":"Mismatched pop_error_scope call: no error scope for this thread. Error scopes are thread-local.","messagePattern":"Mismatched pop_error_scope call: no error scope for this thread\\. Error scopes are thread-local\\.","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"critical","filePath":"wgpu-core/src/error.rs","lineNumber":395,"sourceCode":"        }\n\n        #[cfg(not(feature = \"std\"))]\n        fn is_panicking() -> bool {\n            false\n        }\n\n        let mut error_sink = self.error_sink.0.lock();\n\n        // We go out of our way to avoid panicking while unwinding, because that would abort the process,\n        // and we are supposed to just drop the error scope on the floor.\n        let is_panicking = is_panicking();\n        let thread_id = thread_id::ThreadId::current();\n        let err = \"Mismatched pop_error_scope call: no error scope for this thread. Error scopes are thread-local.\";\n        let scopes = match error_sink.scopes.get_mut(&thread_id) {\n            Some(s) => s,\n            None => {\n                if !is_panicking {\n                    panic!(\"{err}\");\n                } else {\n                    return None;\n                }\n            }\n        };\n        if scopes.is_empty() && !is_panicking {\n            panic!(\"{err}\");\n        }\n        if index as usize != scopes.len() - 1 && !is_panicking {\n            panic!(\n                \"Mismatched pop_error_scope call: error scopes must be popped in reverse order.\"\n            );\n        }\n\n        // It would be more correct in this case to use `remove` here so that when unwinding is occurring\n        // we would remove the correct error scope, but we don't have such a primitive on the web\n        // and having consistent behavior here is more important. If you are unwinding and it unwinds\n        // the guards in the wrong order, it's totally reasonable to have incorrect behavior.","sourceCodeStart":377,"sourceCodeEnd":413,"githubUrl":"https://github.com/gfx-rs/wgpu/blob/3e11ff59bf3f9795d285ecc045014089640d7248/wgpu-core/src/error.rs#L377-L413","documentation":"pop_error_scope_checked validates that the calling thread has a registered error-scope stack. If no scope was ever pushed on this thread, wgpu panics with this message. Error scopes in wgpu are strictly thread-local, so a scope pushed on one thread cannot be popped on another.","triggerScenarios":"Calling device.pop_error_scope() (or the internal equivalent) on a thread that never called push_error_scope; calling pop more times than push on that thread; popping a scope from a different thread than the one that pushed it.","commonSituations":"Multithreaded code where push happens on a worker thread but pop is awaited elsewhere; an unbalanced push/pop pair after an early-return; porting code that assumed error scopes were device-global like in some other APIs.","solutions":["Ensure push_error_scope and pop_error_scope are called on the same thread, paired one-to-one.","Refactor to keep the entire scope push/pop lifecycle in one function/task (use async blocks that run on a single executor thread).","Guard the pop behind a flag set by the corresponding push on the same thread.","If this fires during process shutdown/panic unwinding it is expected to return None instead; only fix code paths that call it normally."],"exampleFix":"// before\nlet handle = std::thread::spawn(move || device.push_error_scope(knd));\n// later, on main thread:\ndevice.pop_error_scope().await; // panics\n// after\nlet handle = std::thread::spawn(move || {\n    device.push_error_scope(knd);\n    // ... work ...\n    device.pop_error_scope() // same thread\n});","handlingStrategy":"validation","validationCode":"fn thread_can_pop(pushed_on: std::thread::ThreadId) -> bool {\n    pushed_on == std::thread::current().id()\n}","typeGuard":"struct ScopedErrorScope<'a> { device: &'a Device }\nimpl Device {\n    fn with_error_scope<F: FnOnce()>(&self, k: ErrorFilter, f: F) {\n        self.push_error_scope(k);\n        f();\n    }\n}","tryCatchPattern":"// panics are not catchable idioms here; instead ensure same-thread pairing\nstd::thread::scope(|s| {\n    s.spawn(|| {\n        device.push_error_scope(ErrorFilter::Validation);\n        device.pop_error_scope(); // same thread\n    });\n});","preventionTips":["Never move scope push/pop across threads; keep them in one function.","Use RAII or closure-based helpers so pairing is structural.","Count pushes/pops in debug builds to catch imbalance early."],"tags":["wgpu","panic","error-scope","thread-local"],"backgroundTag":"mismatched-error-scope","analyzedSha":"3e11ff59bf3f9795d285ecc045014089640d7248","analyzedAt":"2026-09-03T01:43:21.459Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-10T07:17:11.731Z"}