I have a completely encrypted home (auto configured) in bionic and have the same error messages in dmesg. Moreover, since a few weeks ago, the home directory sometimes gets broken in a way that all list requests (ls, browse in nautilus) hang just on the home directory (process in S state) and only a reboot solves this. I found the dmesg messages only because of these hangs which might be unrelated.
I have a completely encrypted home (auto configured) in bionic and have the same error messages in dmesg. Moreover, since a few weeks ago, the home directory sometimes gets broken in a way that all list requests (ls, browse in nautilus) hang just on the home directory (process in S state) and only a reboot solves this. I found the dmesg messages only because of these hangs which might be unrelated.