Fix VM race conditions #2788

Job	Run time
Code (oldstable)	7m 29s
System (stable, cluster, dir)	11m 38s
Documentation	5m 7s
Code (stable)	7m 26s
Client (oldstable, ubuntu-latest)	23s
System (stable, cluster, btrfs)	12m 55s
Code (tip)	10m 26s
Client (oldstable, macos-latest)	25s
System (stable, cluster, lvm)	13m 15s
Client (oldstable, windows-latest)	57s
System (stable, cluster, zfs)	12m 52s
Client (stable, ubuntu-latest)	27s
System (stable, cluster, ceph)	17m 25s
Client (stable, macos-latest)	34s
System (stable, cluster, random)	13m 39s
Client (stable, windows-latest)	58s
System (stable, standalone, dir)	21m 41s
System (stable, standalone, btrfs)	21m 29s
System (stable, standalone, lvm)	32m 34s
System (stable, standalone, zfs)	36m 17s
System (stable, standalone, ceph)	1h 13m 56s
System (stable, standalone, random)	27m 26s
System (oldstable, cluster, dir)	12m 17s
System (oldstable, standalone, dir)	20m 58s
System (tip, cluster, dir)	14m 38s
System (tip, standalone, dir)	25m 8s
	6h 42m 20s

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