QEMU has troubles if host runs on XFS, which is already fixed upstream:

https://git.qemu.org/?p=qemu.git;a=commitdiff;h=b2c6f23f4a9f6d8f1b648705cd46d3713b78d6a2

But as new release is not there qemu-kvm is fixed like distributions do:

https://bugzilla.redhat.com/show_bug.cgi?id=1751934#c22

/reviewed-on nexedi/slapos!650