Comment 2 for bug 1662407

I can reproduce adding such a cache triggering an OOPS in 18.10:

make-bcache -o 7741440 -w 8k -B /dev/md127 -C /dev/nvme0n1p2

RIP 0010:create_empty_buffers+0x29/0x110
CallTrace
create_page_buffers
block_read_full_page
check_disk_change
__add_to_page_cache_locked
blkdev_readpage
...