openai/codex · error · io::Error

file read offset overflowed

Error message

file read offset overflowed

What it means

Error "file read offset overflowed" thrown in openai/codex.

Source

Thrown at codex-rs/exec-server/src/file_read.rs:87

        }
        result
    }

    pub(crate) async fn close(&self, handle_id: &str) {
        self.handles.lock().await.remove(handle_id);
    }

    pub(crate) async fn close_all(&self) {
        self.handles.lock().await.clear();
    }
}

fn read_block_at(file: &File, offset: u64, len: usize) -> io::Result<FileReadBlock> {
    let mut bytes = vec![0; len];
    let mut bytes_read = 0;
    while bytes_read < len {
        let read_offset = offset.checked_add(bytes_read as u64).ok_or_else(|| {
            io::Error::new(io::ErrorKind::InvalidInput, "file read offset overflowed")
        })?;
        match read_file_at(file, &mut bytes[bytes_read..], read_offset) {
            Ok(0) => break,
            Ok(read) => bytes_read += read,
            Err(error) if error.kind() == io::ErrorKind::Interrupted => {}
            Err(error) => return Err(error),
        }
    }
    bytes.truncate(bytes_read);
    Ok(FileReadBlock {
        eof: bytes_read < len,
        bytes,
    })
}

#[cfg(unix)]
fn read_file_at(file: &File, bytes: &mut [u8], offset: u64) -> io::Result<usize> {
    std::os::unix::fs::FileExt::read_at(file, bytes, offset)

View on GitHub (pinned to 339751715c)

Solutions

1. Use a read offset within the file size to avoid overflow.

When it happens

Trigger: Thrown at codex-rs/exec-server/src/file_read.rs:87 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/50e2c470c6810693. Report an issue: GitHub.