>
>
> > Perhaps you can reduce the
> > problem to a small C reproducer?
> >
> That was my intended next step, yes

s***, I didn't resist and I had to explain to my wife that no, I don't
like io_uring more than I like her.

But here it is.

This is a modification of test/connect.c.
I added a pthread comparison example that should achieve the same
sequence of events:
- try to sync connect
- wait a bit
- shutdown

I added a fixed wait for pthread to make sure that shutdown is not
called before connect.

For io_uring, the shutdown is configurable with the program argument.
This works just fine if I sleep before shutdown (as I would expect from a race).
This hangs every time if I don't.

Unless I am missing something I don't think this is the expected behavior