On Sat, May 24, 2025 at 3:17 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> So it seems that "very low-probability issue in our Mac AIO code" is
> the most probable description.
There isn't any macOS-specific AIO code so my first guess would be
that it might be due to aarch64 weak memory reordering (though Andres
speculated that itt should all be one backend, huh), if it's not just
a timing luck thing. Alexander, were the other OSes you tried all on
x86?