login: uvm_fault(0xfffffd807f014550, 0x8, 0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff8140de5e cs 8 rflags 10246 cr2 8 cpl 0 rsp ffff8000243423e0
gsbase 0xffffffff82aedff0  kgsbase 0x0
panic: trap type 6, code=0, pc=ffffffff8140de5e
Starting stack trace...
panic(ffffffff82721714) at panic+0x155 sys/kern/subr_prf.c:229
kerntrap(ffff800024342330) at kerntrap+0x1b7 sys/arch/amd64/amd64/trap.c:334
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
fifo_write(ffff800024342430) at fifo_write+0x4e sys/miscfs/fifofs/fifo_vnops.c:272
VOP_WRITE(fffffd8076d407a8,ffff8000243424e0,3,fffffd807f7d76e8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
ktrwriteraw(ffff8000216ee5b0,fffffd8076d407a8,fffffd807f7d76e8,ffff8000243425a0,ffff800024342580) at ktrwriteraw+0x13d sys/kern/kern_ktrace.c:660
ktrstruct(ffff8000216ee5b0,ffffffff8279fe3a,ffff800024342850,8) at ktrstruct+0x16f ktrwrite2 sys/kern/kern_ktrace.c:625 [inline]
ktrstruct(ffff8000216ee5b0,ffffffff8279fe3a,ffff800024342850,8) at ktrstruct+0x16f sys/kern/kern_ktrace.c:309
doppoll(ffff8000216ee5b0,200000c0,1,ffff800024342948,0,ffff800024342a00) at doppoll+0x68f sys/kern/sys_generic.c:1026
sys_poll(ffff8000216ee5b0,ffff8000243429b8,ffff800024342a00) at sys_poll+0xa7
syscall(ffff800024342a80) at syscall+0x4e6 sys/arch/amd64/amd64/trap.c:626
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc05b3d94a90, count: 246
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 969d4b26-6dee-2bb7-7d35-48434919f208
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