panic: trap type 6, code=0, pc=ffffffff81c3f778
Starting stack trace...
panic(ffffffff834ecb53) at panic+0x1d0 sys/kern/subr_prf.c:229
kerntrap(ffff80003afbeae0) at kerntrap+0x30b
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dovutimens(ffff80002a221240,fffffc00709edd88,ffff80003afbeca0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2690
sys_futimens(ffff80002a221240,ffff80003afbedf0,ffff80003afbed40) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2766
syscall(ffff80003afbedf0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003afbedf0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xdfc745893e0, count: 250
End of stack trace.

dump to dev 4,1 not possible
rebooting...
SeaBIOS (version 1.8.2-google)
Total RAM Size = 0x0000000080000000 = 2048 MiB
CPUs found: 2     Max CPUs supported: 2
SeaBIOS (version 1.8.2-google)
Machine UUID 0d5ef51b-0062-dd1a-a10b-15f17b148763
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f2600: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Sending Seabios boot VM event.
Booting from Hard Disk 0...
>> OpenBSD/amd64 BOOT 3.67
boot> set $lines = 0
set: syntax error
boot> set $maxwidth = 0
set: syntax error
boot> show panic
boot: illegal argument panic
boot> trace
boot> show registers
boot> show proc
boot> ps
boot> show all locks
boot> show malloc
boot> show all pools
boot> machine ddbcpu 0
machine: syntax error
boot>