[Bug 199727] CPU freezes in KVM guests during high IO load on host

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https://bugzilla.kernel.org/show_bug.cgi?id=199727

--- Comment #6 from Roland Kletzing (devzero@xxxxxx) ---
what i have also seen is VM freezes when backup runs in our gitlab vm server,
which is apparently related to fsync/fdatasync sync writes.  

at least for zfs there exists some write starvation issue , as large sync
writes may starve small ones, as there apparently is no fair scheduling for it,
see 

https://github.com/openzfs/zfs/issues/10110

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