The LUKS subtest in testcase_btrfs_basic leaves stale LUKS headers on
the underlying SCSI devices, so if the VM is rebooted the test fails
because the LUKS signature is still there and blkid finds it.
[ 7.683] + udevadm lock ... mkfs.btrfs -f -L btrfs_root -U deadbeef-dead-dead-beef-000000000000 /dev/disk/by-id/scsi-0systemd_foobar_deadbeefbtrfs0
[ 7.729] Label: btrfs_root
[ 7.729] UUID: deadbeef-dead-dead-beef-000000000000
[ 7.743] + udevadm wait --settle --timeout=30 /dev/disk/by-id/scsi-0systemd_foobar_deadbeefbtrfs0 /dev/disk/by-uuid/deadbeef-dead-dead-beef-000000000000 /dev/disk/by-label/btrfs_root
[ 7.788] sda: ... SYMLINK+="disk/by-label/$env{ID_FS_LABEL_ENC}": Added device node symlink "disk/by-label/encdisk0".
[ 37.998] Timed out for waiting devices being initialized.
[ 38.002] TEST-64-UDEV-STORAGE-btrfs_basic.service: Main process exited, code=exited, status=1/FAILURE
Likewise for the BTRFS UUID:
ERROR: non-unique UUID: deadbeef-dead-dead-beef-000000000001
So wipe that too.
System and Service Manager
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