When using docker volumes for /var/lib/mysql on 9p fs. mounts, the initial preallocation fails for ibdata1 file. The error was stating that fallocate failed with exit code 95. Our further investigation revealed that 9p fs (and ZFS) does not support fallocate at all. We tried a few workarounds that we found online, but nothing worked. As it is a common pratice to use MariaDB in a virtual environment, we need a way to use it and it's not realy possible with the current version of MariaDB.