{"record":{"id":"32886dd3ef354ddb","repo":"astrid-runtime/astrid","slug":"invalid-fuse-service-parent-pid","errorCode":null,"errorMessage":"invalid FUSE service parent PID","messagePattern":"invalid FUSE service parent PID","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/astrid-storage-provider-fuse/src/service.rs","lineNumber":184,"sourceCode":"    KernelControlResponse::Failure {\n        code: code.to_owned(),\n        message: message.chars().take(4096).collect(),\n    }\n}\n\nfn validate_launch(launch: &StorageProviderServiceLaunchV1) -> Result<()> {\n    validate_parent(&launch.parent)?;\n    validate_lease(&launch.lease)?;\n    validate_mountpoint(&launch.mountpoint, &launch.lease.resource_path)?;\n    validate_control_path(&launch.control_path, &launch.lease.resource_path)?;\n    Ok(())\n}\n\nfn validate_parent(\n    parent: &astrid_core::storage_filesystem::StorageProviderParentLifetimeV1,\n) -> Result<()> {\n    if parent.pid <= 1 || parent.pid == std::process::id() {\n        bail!(\"invalid FUSE service parent PID\");\n    }\n    if parent.token.len() < 16\n        || parent.token.len() > 512\n        || parent.token.chars().any(char::is_control)\n    {\n        bail!(\"invalid FUSE service parent token\");\n    }\n    if let Some(identity) = parent.start_identity.as_deref()\n        && (identity.is_empty() || identity.len() > 512 || identity.chars().any(char::is_control))\n    {\n        bail!(\"invalid FUSE service parent start identity\");\n    }\n    #[cfg(target_os = \"linux\")]\n    if parent.start_identity.is_none() {\n        bail!(\"FUSE service parent start identity is required on Linux\");\n    }\n    Ok(())\n}","sourceCodeStart":166,"sourceCodeEnd":202,"githubUrl":"https://github.com/astrid-runtime/astrid/blob/affd8760f44190dbdfbec23403f4c4b642c33112/crates/astrid-storage-provider-fuse/src/service.rs#L166-L202","documentation":"Before launching the FUSE service, the parent lifetime descriptor is validated. The parent PID must be greater than 1 and must not be the helper's own PID; otherwise the liveness/token handshake would be meaningless or self-referential. This error signals a malformed or nonsensical parent PID in the launch configuration.","triggerScenarios":"`validate_parent` (called from `validate_launch`) sees `parent.pid <= 1` (unset, 0, or PID 1) or `parent.pid == std::process::id()` when constructing the launch payload.","commonSituations":"Caller forgot to fill in the parent PID field (defaults to 0); a container passed PID 1 of the namespace; a bug where the helper spawned itself as parent; deserialized config with missing pid.","solutions":["Set `parent.pid` to the real PID of the spawning process (`std::process::id()` on the parent side) before launching.","Reject/validate the launch config on the parent side before spawning the helper.","Avoid running the mounting client as PID 1 (or pass a dedicated supervisor's PID) in containers.","Fix serialization so the pid field is always populated when building `StorageProviderParentLifetimeV1`."],"exampleFix":"// before\nlet parent = StorageProviderParentLifetimeV1 { pid: 0, token, .. };\n// after\nlet parent = StorageProviderParentLifetimeV1 { pid: std::process::id(), token, .. };","handlingStrategy":"validation","validationCode":"fn valid_parent_pid(pid: u32) -> bool { pid > 1 && pid != std::process::id() }\nif !valid_parent_pid(parent.pid) { return Err(\"bad parent pid\"); }","typeGuard":"fn has_valid_pid(parent: &StorageProviderParentLifetimeV1) -> bool {\n    parent.pid > 1 && parent.pid != std::process::id()\n}","tryCatchPattern":null,"preventionTips":["Always set pid to the spawning process's real PID","Never run the mounting client as PID 1 in containers","Validate the launch descriptor before spawning the helper"],"tags":["fuse","validation","process"],"backgroundTag":"invalid-argument-value","analyzedSha":"affd8760f44190dbdfbec23403f4c4b642c33112","analyzedAt":"2026-09-09T21:28:12.402Z","contentChangedAt":"2026-09-09T21:28:12.402Z","schemaVersion":2},"datasetVersion":"2026-09-14T11:17:12.474Z"}