{"record":{"id":"24855894d7665fd2","repo":"xai-org/grok-build","slug":"reading-command-stdout-e","errorCode":null,"errorMessage":"reading command stdout: {e}","messagePattern":"reading command stdout: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/codegen/xai-grok-shell/src/auth/auth_provider.rs","lineNumber":313,"sourceCode":"        tracing::debug!(error = %e, \"auth provider: could not enroll helper process group\");\n    }\n    let stdout = child.stdout.take().expect(\"stdout is piped\");\n    let stderr = child.stderr.take().expect(\"stderr is piped\");\n    let mut out_buf = Vec::new();\n    let mut err_buf = Vec::new();\n\n    // One extra stdout byte so an over-cap write is detectable, not truncated.\n    // The stderr read is advisory (it only feeds the failure log), so only\n    // stdout governs the mint.\n    let capture = async {\n        let (out_res, err_res) = tokio::join!(\n            read_capped(stdout, PROVIDER_STDOUT_CAP_BYTES + 1, &mut out_buf),\n            read_capped(stderr, PROVIDER_STDERR_CAP_BYTES, &mut err_buf),\n        );\n        if let Err(e) = err_res {\n            tracing::debug!(error = %e, \"auth provider: stderr capture failed (advisory)\");\n        }\n        out_res.map_err(|e| anyhow::anyhow!(\"reading command stdout: {e}\"))?;\n        child\n            .wait()\n            .await\n            .map_err(|e| anyhow::anyhow!(\"waiting on command: {e}\"))\n    };\n\n    let status = match tokio::time::timeout(timeout, capture).await {\n        Ok(res) => res?,\n        Err(_elapsed) => {\n            let _ = group.kill();\n            anyhow::bail!(\"command timed out after {}s\", timeout.as_secs());\n        }\n    };\n    if out_buf.len() as u64 > PROVIDER_STDOUT_CAP_BYTES {\n        anyhow::bail!(\"command wrote more than {PROVIDER_STDOUT_CAP_BYTES} bytes to stdout\");\n    }\n    Ok(std::process::Output {\n        status,","sourceCodeStart":295,"sourceCodeEnd":331,"githubUrl":"https://github.com/xai-org/grok-build/blob/bc7f02eddd3d84085849dc19ed216f11c23b0571/crates/codegen/xai-grok-shell/src/auth/auth_provider.rs#L295-L331","documentation":"run_capped reads the helper's stdout with read_capped (with a byte cap). If the stdout read future returns an error it is surfaced as 'reading command stdout'. Stderr read failures are only advisory and logged, not fatal.","triggerScenarios":"The pipe to the helper's stdout breaking (helper killed the reader side), an IO error on the pipe, or read_capped failing internally during capture.","commonSituations":"Helper process being killed by OOM-killer or security policy mid-run, pipe buffer misuse in a forked helper, or disk/IO errors in exotic setups.","solutions":["Check whether the helper process died unexpectedly (dmesg/oom logs, exit signals)","Re-run mint_provider_token to see if it is transient","Ensure the helper writes bounded output; oversized output is capped, but corrupt pipes indicate helper misbehavior"],"exampleFix":null,"handlingStrategy":"retry","validationCode":null,"typeGuard":null,"tryCatchPattern":"match mint_provider_token().await {\n    Err(e) if e.to_string().contains(\"reading command stdout\") => {\n        eprintln!(\"helper died mid-run: {e}; check oom/kill logs, retrying once\");\n        mint_provider_token().await?;\n    }\n    other => other?,\n}","preventionTips":["Keep helper output bounded and well-formed","Monitor for helper crashes (signals, OOM) in system logs","Retry transient IO failures with a single retry before failing the flow"],"tags":["io","pipe","process"],"backgroundTag":"stdout-read-failed","analyzedSha":"bc7f02eddd3d84085849dc19ed216f11c23b0571","analyzedAt":"2026-08-31T04:59:42.031Z","schemaVersion":2},"datasetVersion":"2026-08-31T09:17:48.483Z"}