bug#46630: GNU Parted bug: Unable to determine the dm type of /dev/mapper/name

Fyi...

I get the following error when I run "partprobe /dev/mapper/name" as
non-root on Ubuntu 20.04.

$  partprobe  /dev/mapper/name
/dev/mapper/control: open failed: Permission denied
Failure to communicate with kernel device-mapper driver.
Incompatible libdevmapper 1.02.167 (2019-11-30) and kernel driver
(unknown version).
A bug has been detected in GNU Parted.  Refer to the web site of
parted http://www.gnu.org/software/parted/parted.html for more
information of what could be useful for bug submitting!  Please email
a bug report to [email protected] containing at least the version
(3.3) and the following message:  Unable to determine the dm type of
/dev/mapper/name.

----

I did not expect partprobe to work as non-root.  But I did expect a
terse(r) error message.

For example, the following error message is expectedly terse.

$  partprobe  /dev/sdf
Error: Error opening /dev/sdf: Permission denied