Re: [GIT PULL] io_uring fixes for 6.0-rc1

[Linus Torvalds <torvalds@linux-foundation.org>]

[ Crossed emails ]

On Fri, Aug 12, 2022 at 2:34 PM Jens Axboe <axboe@kernel.dk> wrote:
>
> Keith brought up a good point, is this some weird randomization of
> io_kiocb that makes it bigger? struct io_rw is already at 64-bytes as it
> is, if it gets re-arranged for more padding maybe that's what you're
> hitting? Is it just io_rw or are you seeing others?

I think was seeing others (I got hundreds of lines or errors), but now
that I've blown things away I can't recreate it. My allmodconfig build
just completed with no sign of the errors I saw earlier.

I think Keith is right. An allmodconfig build for me has

  CONFIG_RANDSTRUCT=y
  CONFIG_GCC_PLUGIN_RANDSTRUCT=y

and the io_uring "type safety" isn't actually typesafe: it just checks
the size of types.

The other alternative is that we have some build dependency issue, and
blowing away my old tree fixed things. But that sounds unlikely, we
haven't had those kinds of issues in a long time.

           Linus