panic: trap type 6, code=10, pc=0
Starting stack trace...
panic(ffffffff83302432) at panic+0x1ba sys/kern/subr_prf.c:229
kerntrap(ffff80002a8db4b0) at kerntrap+0x28b sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
0(fffffd805dcbff08,fffffd805dcbff08,0,fffffd805dcbff08,298,0) at 0
softclock_process_kclock_timeout(fffffd805dcbff08,0) at softclock_process_kclock_timeout+0x2a0 sys/kern/kern_timeout.c:692
softclock(0) at softclock+0x199 sys/kern/kern_timeout.c:745
softintr_dispatch(0) at softintr_dispatch+0xfe sys/kern/kern_softintr.c:87
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:840
Xsoftclock() at Xsoftclock+0x27
ttread(ffff80000143f600,ffff80002a8dbb90,0) at ttread+0x861 sys/kern/tty.c:1589
ptsread(500,ffff80002a8dbb90,0) at ptsread+0x319 sys/kern/tty_pty.c:321
spec_read(ffff80002a8db980) at spec_read+0x14c sys/kern/spec_vnops.c:215
VOP_READ(fffffd8069318528,ffff80002a8dbb90,0,fffffd807f7d7270) at VOP_READ+0x102 sys/kern/vfs_vops.c:227
vn_read(fffffd806305f000,ffff80002a8dbb90,0) at vn_read+0x16d sys/kern/vfs_vnops.c:369
dofilereadv(ffff8000339079d0,6,ffff80002a8dbb90,0,ffff80002a8dbc50) at dofilereadv+0x230 sys/kern/sys_generic.c:252
sys_readv(ffff8000339079d0,ffff80002a8dbd00,ffff80002a8dbc50) at sys_readv+0xd8 sys/kern/sys_generic.c:199
syscall(ffff80002a8dbd00) at syscall+0x97e mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a8dbd00) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xdcbe8520b70, count: 239
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 6a63e308-43db-2955-5bd8-f45d251cdfc1
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 0x000f2820: 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 $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> trace
boot> machine ddbcpu 1
machine: syntax error
boot> trace