Comment 11 for bug 1942935

Here is Donald Buczek's reproducer script. I setup an Ubuntu 20.04 VM with latest linux-image-generic and was able to reproduce it within maybe 10 or 15 minutes. Exactly the same issue.

Filesystem layout built as follows:

# assemble raid devices
mdadm --create /dev/md0 --level=1 --raid-devices=2 --spare-devices=1 /dev/sda2 /dev/sdb2 /dev/sdc2
mdadm --create /dev/md1 --level=5 --raid-devices=5 /dev/sda3 /dev/sdb3 /dev/sdc3 /dev/sdd3 /dev/sde3

# create PVs, VGs, LVs
pvcreate /dev/md1
vgcreate vg1 /dev/md1
lvcreate --name root --extents 100%FREE vg1

# create filesystems
mkfs.ext4 /dev/md0
mkfs.ext4 /dev/vg1/root