After cPanel's latest update (11.46.0 Build 12) many people have been receiving notifications or emails containing similar messages:

Subject: Output from your job 805
Message: repquota: Cannot stat() mounted device /dev/simfs: No such file or directory
repquota: Cannot stat() mounted device /dev/simfs: No such file or directory

This is a normal error in our virtualization environment, and in almost all cases it can safely be ignored. It's actually a result of security hardening.

The error message results from the way KnownHost's secured VPS's mount /tmp with the noexec option when guest containers, or VPS's, are mounted from the host node. The noexec option prevents programs from running in the system temporary directory. Our VPS's are not configured with a simfs device, so this results in harmless errors during quota operations at the container or VPS level.

– Credits to William K. of our support department

If you have any further questions or concerns feel free to comment in this article or open a Support Department ticket.