Comment # 3 on bug 1183948 from Diego Ercolani

On my system the issue is "in place":

pc-diego:~ # cat /etc/os-release 
NAME="openSUSE Leap"
VERSION="15.3"
ID="opensuse-leap"
ID_LIKE="suse opensuse"
VERSION_ID="15.3"
PRETTY_NAME="openSUSE Leap 15.3"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:opensuse:leap:15.3"
BUG_REPORT_URL="https://bugs.opensuse.org"
HOME_URL="https://www.opensuse.org/"
pc-diego:~ # lvm-cache-stats /dev/raid/rootfs
rootfs              rootfs_cache_cdata  rootfs_cache_cmeta  
pc-diego:~ # lvm-cache-stats /dev/raid/rootfs
Failed to get stats for '/dev/raid/rootfs': Failed to create DM task for the
cache map '-dev/raid/rootfs': 
pc-diego:~ #