"Invalid argument" Error in the sq_poll Example

[lei-houjyu]

Hi, I'm new to io_uring and encountered the following error when running the sq_poll example:

$ sudo ./sq_poll
Kernel thread io_uring-sq is not running.
Error in async operation: Invalid argument
Result of the operation: -22
Error in async operation: Invalid argument
Result of the operation: -22
   7963 ?        00:00:00 io_uring-sq
Kernel thread io_uring-sq found running...
Error in async operation: Invalid argument
Result of the operation: -22
Error in async operation: Invalid argument
Result of the operation: -22
Contents read from file:

My environment is:

$ uname -r
5.4.0-67-generic
$ cmake --version
cmake version 3.16.3

CMake suite maintained and supported by Kitware (kitware.com/cmake).

Does anyone have any suggestions? Many thanks!