intermittent failure in test-aio-multithread

[Peter Maydell]

Anybody got any idea about this one?

ERROR:../tests/unit/test-aio-multithread.c:371:test_multi_fair_mutex:
assertion failed (counter == atomic_counter): (316636 == 316637)
(test program exited with status code -6)

See https://gitlab.com/qemu-project/qemu/-/issues/2127 for links
to the CI job log.

I think this is the first time I've seen this particular failure;
CI job was on an AArch64 host, in case that matters.

CCing Paolo as the last person to make significant changes
to this test case...

thanks
-- PMM