While I have not found out where exactly things go wrong, I could confirm that this is related to ppc64el builds using a 64k page size. I build a test kernel with 4k page size and installed it inside the VM. With that bcache-super-show will will reflect the correct status after activation and also the superblock magic will remain intact when breaking the cache and backing device.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1602299 Title: bcache is unstable on ppc64el To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1602299/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
