uvm_fault(0xfffffd806ee20b88, 0x8, 0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff819a15be cs 8 rflags 10246 cr2 8 cpl 0 rsp ffff80002a860a10
gsbase 0xffffffff8294bff0  kgsbase 0x0
panic: trap type 6, code=0, pc=ffffffff819a15be
Starting stack trace...
panic(ffffffff825a448b) at panic+0x16b sys/kern/subr_prf.c:229
kerntrap(ffff80002a860960) at kerntrap+0x1c7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
fifo_write(ffff80002a860a60) at fifo_write+0x4e sys/miscfs/fifofs/fifo_vnops.c:271
VOP_WRITE(fffffd80760e8438,ffff80002a860b18,3,fffffd807f7d7270) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
ktrwriteraw(ffff800021259a40,fffffd80760e8438,fffffd807f7d7270,ffff80002a860be0,ffff80002a860bc0) at ktrwriteraw+0x15f sys/kern/kern_ktrace.c:660
ktrstruct(ffff800021259a40,ffffffff8264141d,ffff80002a860cd0,10) at ktrstruct+0x175 ktrwrite2 sys/kern/kern_ktrace.c:625 [inline]
ktrstruct(ffff800021259a40,ffffffff8264141d,ffff80002a860cd0,10) at ktrstruct+0x175 sys/kern/kern_ktrace.c:309
sys_nanosleep(ffff800021259a40,ffff80002a860d40,ffff80002a860d90) at sys_nanosleep+0xe0 sys/kern/kern_time.c:289
syscall(ffff80002a860e10) at syscall+0x4c2 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff80002a860e10) at syscall+0x4c2 sys/arch/amd64/amd64/trap.c:599
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffff02e0, count: 247
End of stack trace.

dump to dev 4,1 not possible
rebpoanioct:i nkgern.e.l.
 diagnostic assertioSeaBIOS (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 003a59b7-54eb-38ca-1cfb-72bc238e03e5
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 0x000f2480: 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 3.55
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