Hi, after a routine buildworld/kernel/installworld/kernel/etcupdate on a stable/12 bhyve guest, loader started to spit: Consoles: EFI console Reading loader env vars from /efi/freebsd/loader.env Setting currdev to disk0p1: FreeBSD/amd64 EFI loader, Revision 1.1 Command line arguments: loader.efi EFI version: 2.40 EFI Firmware: BHYVE (rev 1.00) Console: efi (0x20001000) Load Path: \EFI\BOOT\BOOTX64.EFI Load Device: PciRoot(0x0)/Pci(0x3,0x0)/HD(1,GPT,A7A0422F-6F85-11EA-8A55-00A09858FAF5,0x28,0x64000) BootCurrent: 0000 BootOrder: 0000[*] 0001 0002 0003 BootInfo Path: PciRoot(0x0)/Pci(0x3,0x0) Ignoring Boot0000: Only one DP found Trying ESP: PciRoot(0x0)/Pci(0x3,0x0)/HD(1,GPT,A7A0422F-6F85-11EA-8A55-00A09858FAF5,0x28,0x64000) Setting currdev to disk0p1: Trying: PciRoot(0x0)/Pci(0x3,0x0)/HD(2,GPT,A7C612E0-6F85-11EA-8A55-00A09858FAF5,0x64028,0x400) Setting currdev to disk0p2: Trying: PciRoot(0x0)/Pci(0x3,0x0)/HD(3,GPT,A7D27D9F-6F85-11EA-8A55-00A09858FAF5,0x64800,0x800000) Setting currdev to disk0p3: Trying: PciRoot(0x0)/Pci(0x3,0x0)/HD(4,GPT,A7D7E55E-6F85-11EA-8A55-00A09858FAF5,0x864800,0x479B000) Setting currdev to zfs:zroot/ROOT/default: ZFS: i/o error - all block copies unavailable ZFS: i/o error - all block copies unavailable ERROR: /boot/lua/loader.lua:1: unexpected symbol near '`'. Type '?' for a list of commands, 'help' for more detailed help. OK - KERNCONF is stock GENERIC - problematic version is stable/12-c243335-ge817c8f77fe - Booting off 12.2-STABLE snapshot ISO 20210128-r369150 and using -a flag to ask for a root mount and specifying zfs:zroot/ROOT/default makes the system run normally (apropriate modules have to be loaded from within the loadet, ofc). - using in-tree zfs - zpool scrub did not show any anomalies - gpart bootcode has already been run (after first unsusccessful boot). - Another bhyve guest (13.0-ALPHA3) on the same host works OK Any suggestions what to check, please? Thanks otis ? Juraj Lutter XMPP: juraj (at) lutter.sk GSM: +421907986576