{"record":{"id":"1089d6a885c07918","repo":"xai-org/grok-build","slug":"invalid-u64-in-memory-current","errorCode":null,"errorMessage":"<invalid u64 in memory.current>","messagePattern":"<invalid u64 in memory\\.current>","errorType":"validation","errorClass":"std::io::Error","httpStatus":null,"severity":"warning","filePath":"crates/codegen/xai-grok-tools/src/computer/local/cgroup.rs","lineNumber":243,"sourceCode":"                \"Created cgroup with memory limits\"\n            );\n\n            Ok(CgroupHandle { fs_path })\n        }\n\n        /// Move a process (by PID) into this cgroup.\n        pub(crate) async fn add_process(&self, pid: u32) -> std::io::Result<()> {\n            let procs_path = self.fs_path.join(\"cgroup.procs\");\n            tokio::fs::write(&procs_path, pid.to_string()).await\n        }\n\n        /// Read `memory.current` from this cgroup.\n        #[allow(dead_code)]\n        pub(crate) async fn memory_current(&self) -> std::io::Result<u64> {\n            let s: String = tokio::fs::read_to_string(self.fs_path.join(\"memory.current\")).await?;\n            s.trim()\n                .parse::<u64>()\n                .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, e))\n        }\n\n        /// Filesystem path to this cgroup.\n        pub(crate) fn path(&self) -> &std::path::Path {\n            &self.fs_path\n        }\n    }\n\n    impl Drop for CgroupHandle {\n        fn drop(&mut self) {\n            let path = self.fs_path.clone();\n            // Always use tokio::spawn: the cleanup future is Send and Drop\n            // can fire after the LocalSet has shut down, making spawn_local\n            // unsafe here.\n            tokio::spawn(async move {\n                let kill_path = path.join(\"cgroup.kill\");\n                let _ = tokio::fs::write(&kill_path, \"1\").await;\n                tokio::time::sleep(std::time::Duration::from_millis(50)).await;","sourceCodeStart":225,"sourceCodeEnd":261,"githubUrl":"https://github.com/xai-org/grok-build/blob/bc7f02eddd3d84085849dc19ed216f11c23b0571/crates/codegen/xai-grok-tools/src/computer/local/cgroup.rs#L225-L261","documentation":"memory_current reads the cgroup's memory.current file and parses its trimmed contents as u64; if the parse fails it wraps the ParseIntError in an io::Error with InvalidData. The message \"<invalid u64 in memory.current>\" indicates the kernel-reported value could not be interpreted as an unsigned 64-bit integer.","triggerScenarios":"memory.current containing \"max\", an empty string, or non-numeric bytes — e.g. reading from a wrong/placeholder cgroup path, a mocked or virtualized filesystem, or a file truncated to garbage.","commonSituations":"Pointing fs_path at a directory that is not a real cgroup; tests stubbing memory.current with placeholder text; container runtimes exposing nonstandard cgroup files; race where the cgroup directory is being torn down and reads return partial data.","solutions":["Verify fs_path points to an actual cgroupv2 directory containing a valid memory.current file.","cat the file manually to inspect its contents for non-numeric values like \"max\" or empty output.","Add a fallback (return None / a sentinel) when parsing fails so monitoring code treats it as an unreadable gauge rather than an error.","Retry after a short delay if the cgroup is being created/destroyed concurrently."],"exampleFix":"// before\nlet bytes = cgroup.memory_current()?;\n// after\nlet bytes = match cgroup.memory_current() {\n    Ok(b) => b,\n    Err(e) if e.kind() == std::io::ErrorKind::InvalidData => {\n        tracing::warn!(\"memory.current unreadable; skipping sample\");\n        0\n    }\n    Err(e) => return Err(e),\n};","handlingStrategy":"try-catch","validationCode":"let raw = tokio::fs::read_to_string(cgroup.path().join(\"memory.current\")).await?;\nlet valid = raw.trim().parse::<u64>().is_ok();","typeGuard":null,"tryCatchPattern":"match cgroup.memory_current().await {\n    Ok(v) => v,\n    Err(e) if e.kind() == std::io::ErrorKind::InvalidData => 0, // skip sample\n    Err(e) => return Err(e.into()),\n}","preventionTips":["Confirm the cgroup path is a real cgroupv2 directory before sampling.","Sanitize/guard metrics values so non-numeric states are reported as unavailable.","Log the raw file contents when parsing fails to ease diagnosis.","Poll memory.events/memory.current only after the cgroup is fully created."],"tags":["linux","cgroup","parse-error","invalid-data"],"backgroundTag":"invalid-number-parse","analyzedSha":"bc7f02eddd3d84085849dc19ed216f11c23b0571","analyzedAt":"2026-08-31T04:59:42.031Z","schemaVersion":2},"datasetVersion":"2026-08-31T09:17:48.483Z"}