Comment 8 for bug 1877716

As of version 5.0.0-6 (released a day ago), qemu on Arch is no longer built with io_uring support because of this bug. The previous version (5.0.0-5) was built with io_uring support and this bug was happening on my machine. Before the fixed version was released I myself added --disable-linux-io-uring to the build file of 5.0.0-5 and that fixed the issue for me. Now I'm running 5.0.0-6 and it's working as good as ever.
You can track the changes of qemu build files here: https://git.archlinux.org/svntogit/packages.git/log/trunk?h=packages/qemu