{"record":{"id":"b1e1747a44a4b87f","repo":"tauri-apps/tauri","slug":"unable-to-create-thread-with-8mib-stack","errorCode":null,"errorMessage":"unable to create thread with 8MiB stack","messagePattern":"unable to create thread with 8MiB stack","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"critical","filePath":"crates/tauri-codegen/src/context.rs","lineNumber":479,"sourceCode":"    );\n\n    #with_tray_icon_code\n    #maybe_config_parent_setter\n\n    context\n  });\n\n  // Wrapping in a function to make rust analyzer faster,\n  // see https://github.com/tauri-apps/tauri/pull/14457\n  // We take the assets as an argument so when the caller provides custom `assets` the closure\n  // does not capture from the caller's scope (\"can't capture dynamic environment in a fn item\").\n  let output = quote!({\n    fn inner<R: #root::Runtime, A: #root::Assets<R> + 'static>(assets: A) -> #root::Context<R> {\n      let thread = ::std::thread::Builder::new()\n        .name(String::from(\"generated tauri context creation\"))\n        .stack_size(8 * 1024 * 1024)\n        .spawn(move || #context)\n        .expect(\"unable to create thread with 8MiB stack\");\n\n      match thread.join() {\n        Ok(context) => context,\n        Err(_) => {\n          eprintln!(\"the generated Tauri `Context` panicked during creation\");\n          ::std::process::exit(101);\n        }\n      }\n    }\n    inner(#assets)\n  });\n\n  Ok(output)\n}\n\nfn find_icon(\n  config: &Config,\n  config_parent: &Path,","sourceCodeStart":461,"sourceCodeEnd":497,"githubUrl":"https://github.com/tauri-apps/tauri/blob/52e4b6e71d8632a7e648f866c442e287ecddee34/crates/tauri-codegen/src/context.rs#L461-L497","documentation":"Runtime panic in code emitted by tauri-codegen (added so rust-analyzer stays fast): Context creation runs on a dedicated thread built with thread::Builder::stack_size(8 * 1024 * 1024).spawn(...), and .expect(\"unable to create thread with 8MiB stack\") fires when the OS refuses to spawn that thread — normally memory limits (RLIMIT_AS, cgroups) or thread/process limits — killing the app at startup.","triggerScenarios":"Launching the app where virtual memory is capped below the 8 MiB stack plus working set (`ulimit -v`), a container cgroup memory limit hit during startup, or an exhausted thread/process limit (RLIMIT_NPROC, systemd TasksMax) in a restricted sandbox.","commonSituations":"Minimal Docker containers with tight --memory or ulimit -v settings; systemd units with MemoryLimit/TasksMax set too low; heavily threaded apps (runtime pools, telemetry SDKs) hitting limits before Context creation.","solutions":["Raise or remove the virtual-memory limit: increase `ulimit -v` and the container/systemd memory cap","Check thread/process ceilings: `ulimit -u`, systemd TasksMax, cgroup pids.max — leave headroom for one more thread","Reduce threads spawned before main (background pools, agents) so the context thread can be created","Update to the latest Tauri patch release and, if limits were already adequate, report the environment details upstream"],"exampleFix":"# before: docker run --memory=32m myapp → panics at startup\n# after: give the app room for the 8 MiB context thread\ndocker run --memory=512m myapp","handlingStrategy":"validation","validationCode":"# verify the deployment environment can spawn an 8 MiB-stack thread\nulimit -v unlimited 2>/dev/null || echo \"WARNING: RLIMIT_AS set\"\npython3 -c \"import threading;threading.stack_size(8*1024*1024);t=threading.Thread(target=lambda:None);t.start();t.join();print('8MiB thread OK')\"","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Do not set `ulimit -v` for Tauri apps; size cgroup memory limits above app footprint + 8 MiB","Boot-test the packaged app under the same limits as production before release","Minimize threads spawned before Context creation"],"tags":["runtime","thread","memory","startup","panic"],"backgroundTag":"thread-spawn-failed","analyzedSha":"52e4b6e71d8632a7e648f866c442e287ecddee34","analyzedAt":"2026-08-20T13:59:20.734Z","contentChangedAt":"2026-08-20T13:59:20.734Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}