uvm_fault(0xfffffd806b93c230, 0x8, 0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff81205b0e cs 8 rflags 10246 cr2 8 cpl 0 rsp ffff80002b40a650
gsbase 0xffffffff82b47ff0  kgsbase 0x0
panic: trap type 6, code=0, pc=ffffffff81205b0e
Starting stack trace...
panic(ffffffff8271b381) at panic+0x155 sys/kern/subr_prf.c:229
kerntrap(ffff80002b40a5a0) at kerntrap+0x1b7 sys/arch/amd64/amd64/trap.c:334
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
fifo_write(ffff80002b40a6a0) at fifo_write+0x4e sys/miscfs/fifofs/fifo_vnops.c:272
VOP_WRITE(fffffd8069e70100,ffff80002b40a750,3,fffffd807f7d7888) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
ktrwriteraw(ffff800027fc62e8,fffffd8069e70100,fffffd807f7d7888,ffff80002b40a810,ffff80002b40a7f0) at ktrwriteraw+0x13d sys/kern/kern_ktrace.c:660
ktrstruct(ffff800027fc62e8,ffffffff8275a4f0,ffff80002b40a8c0,80) at ktrstruct+0x16f ktrwrite2 sys/kern/kern_ktrace.c:625 [inline]
ktrstruct(ffff800027fc62e8,ffffffff8275a4f0,ffff80002b40a8c0,80) at ktrstruct+0x16f sys/kern/kern_ktrace.c:309
sys_fstat(ffff800027fc62e8,ffff80002b40a9a0,ffff80002b40a9f0) at sys_fstat+0x1cb sys/kern/kern_descrip.c:813
syscall(ffff80002b40aa70) at syscall+0x4e6 sys/arch/amd64/amd64/trap.c:626
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffd9190, count: 247
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 1f5eaa37-9319-de71-8c79-d2e486f4a21c
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 3.55
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