uvm_fault(0xfffffd806be811e0, 0xf, 0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff828da238 cs 8 rflags 10246 cr2 f cpl 0 rsp ffff80003c50f8a0
gsbase 0xffffffff837a8ff0  kgsbase 0x0
panic: trap type 6, code=0, pc=ffffffff828da238
Starting stack trace...
panic(ffffffff83317482) at panic+0x1d0 sys/kern/subr_prf.c:229
kerntrap(ffff80003c50f7f0) at kerntrap+0x29b sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
ktrops(ffff80003c4d6548,ffffffffffffffff,0,80000310,fffffd806bad83a0,fffffd807f7d2548) at ktrops+0x58 ktrcanset sys/kern/kern_ktrace.c:727 [inline]
ktrops(ffff80003c4d6548,ffffffffffffffff,0,80000310,fffffd806bad83a0,fffffd807f7d2548) at ktrops+0x58 sys/kern/kern_ktrace.c:570
doktrace(fffffd806bad83a0,4,310,0,ffff80003c4d6548) at doktrace+0x6dd ktrsetchildren sys/kern/kern_ktrace.c:595 [inline]
doktrace(fffffd806bad83a0,4,310,0,ffff80003c4d6548) at doktrace+0x6dd sys/kern/kern_ktrace.c:517
sys_ktrace(ffff80003c4d6548,ffff80003c50fc00,ffff80003c50fb50) at sys_ktrace+0x11c sys/kern/kern_ktrace.c:558
syscall(ffff80003c50fc00) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c50fc00) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xa35f1f64a10, count: 249
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 479bd2e4-6073-186a-8c25-a69e4074584d
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 0x000f27d0: 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> trace
boot> machine ddbcpu 1
machine: syntax error
boot> trace