I can replicate your bug with fstrim -a command. Can you please try it (save your work before)?
In fact, bug reproduces itself in a weekly bases thanks to fstrim systemd timer. Timer can be disabled with: sudo systemctl disable fstrim.timer command.
In my understanding, fstrim tries to trim cache drive, however it locked by bcache.
Hello step21,
I can replicate your bug with fstrim -a command. Can you please try it (save your work before)?
In fact, bug reproduces itself in a weekly bases thanks to fstrim systemd timer. Timer can be disabled with: sudo systemctl disable fstrim.timer command.
In my understanding, fstrim tries to trim cache drive, however it locked by bcache.
OS: Ubuntu 18.10
Kernel: 4.18.0-12-generic #13-Ubuntu
Can you please confirm?