Re: Linux 5.19-rc7 liburing test `poll-mshot-overflow.t` and `read-write.t` fail

[Ammar Faizi]

On 7/21/22 7:05 PM, Dylan Yudaken wrote:
> It seems to be a problem with blocking reads, buffer select and READV.
> My guess is that ext4/xfs are not blocking.
>
> in b66e65f41426 ("io_uring: never call io_buffer_select() for a buffer
> re-select"), this line was added in __io_iov_buffer_select
>
> -       iov[0].iov_len = len;
> +       req->rw.len = iov[0].iov_len = len;
>
> Basically stashing the buffer length in rw.len. The problem is that the
> next time around that breaks at
>
>          if (req->rw.len != 1)
>                  return -EINVAL;
>
>
> The below fixes it as an example, but it's not great. Maybe someone can
> figure out a better patch? Otherwise I can try tomorrow:

It's 8:05 PM from my end. I'll try to play with your patch after dinner
while waiting for others say something.

--
Ammar Faizi