Forcing ext4lazyinit to finish its thing?

In order to 'force' ext4lazyinit to finish the thing it does with maximum priority, you need to mount the filesystem with 'init_itable=0'. By default it is 10 (for detail please see link below)

Alternative solution is to disable the ext4lazyinit thread by mount option 'noinit_itable' which may however not be a good idea on production system (for detail please see link below).

Source with detailed info here ext4lazyinit git commit comment.