fs.read error #4443

fs.read(fd, buf, 0, buf.length, stat.size-buf.length-i, function(err, bytesRead, buffer) {
                    if(err) {console.log(err);throw err;}
                           buffer.copy(lastlinebuffer,position, 0,1);
                    position++;
                    if(position>100000)console.log("文件最后行太长超出缓存区");
                    if (buffer[0] === 0x0a) { //0x0a == '\n'


{ [Error: EINVAL, read] errno: -4071, code: 'EINVAL' }
Error: EINVAL, read
    at Error (native)