JATtho

I had a similar debacle, when I managed to corrupt a btrfs file system to point it wouldn't mount again...

I was preparing it to have as my main system on bare hardware. I had accidentally mounted the same block device simultaneously in the host and guest: kablamo silent corruption and all 5 hours of progress lost.^*^ :(

*shred the guest VM, host was ok.

On arch, UEFI boot vars are mounted at /sys/firmware/efi/efivars. It's unwise to rm -rf them....