Hi fellow #FreeBSD users. Anyone experienced boot panic with the message "panic: free: guard2 fail @ 0x72b4f9e0 + 2065 from unknown: 0"? Last week the box booted fine (13 on two ssds with geli/zroot in a zraid) and the only difference which makes me wonder is that the hard drives are now labelled different upon boot (disk1p... and disk2p... instead of disk0 and disk1) since last week.
Okay, it seems the issue was caused by some corruption in the boot loader code. I copied it over (loader.efi -> boot...efi) from a live dvd and now it seems to be working fine. No idea though how such a thing could have happened.