vdostats fails with "Error enumerating VDO devices: dmsetup: command failed, exit status 2" if it is run by cron

Issue

• When vdostats command is run by cron, it fails with "Error enumerating VDO devices: dmsetup: command failed, exit status 2" error.

# crontab -l
*/10 * * * * /usr/bin/vdostats

# less /var/log/cron
[...]
Aug 22 04:35:01 localhost CROND[617534]: (root) CMDOUT (Error enumerating VDO devices: dmsetup: command failed, exit status 2)
[...]

• We can run it manually without the error.

# vdostats
Device               1K-blocks      Used Available Use% Space saving%
/dev/mapper/vdo-test   6291456   4196060   2095396  66%           98%