Comment 2 for bug 1848496

Related logs from journalctl -b:
os-prober[6348]: debug: running /usr/lib/os-probes/10zvol-test on /dev/sda5
os-prober[6351]: debug: running /usr/lib/os-probes/50mounted-tests on /dev/sda5
50mounted-tests[6361]: debug: creating device mapper device /dev/mapper/osprober-linux-sda5
kernel: device-mapper: table: 253:0: linear: Device lookup failed
kernel: device-mapper: ioctl: error adding target to table

Running "sudo sh -x /usr/lib/os-probes/50mounted-tests /dev/sda5" shows that it fails with:

+ logger -t 50mounted-tests debug: creating device mapper device /dev/mapper/osprober-linux-sda5
+ dmsetup create -r osprober-linux-sda5
+ echo 0 14706655 linear /dev/sda5 0
device-mapper: reload ioctl on osprober-linux-sda5 failed: Device or resource busy
Command failed.
+ dm_device=
+ [ ]
+ do_unmount
+ [ ]
+ [ -e ]
+ rmdir /var/lib/os-prober/mount
+ exit 1

"sudo dmsetup ls" / status / info report that "No devices found".