panic: trap type 6, code=0, pc=ffffffff824b23ff
Starting stack trace...
panic(ffffffff8284d99d) at panic+0x16f sys/kern/subr_prf.c:229
kerntrap(ffff80002ecc3f20) at kerntrap+0x1d7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
fifo_write(ffff80002ecc4010) at fifo_write+0x4f sys/miscfs/fifofs/fifo_vnops.c:273
VOP_WRITE(fffffd80677fd958,ffff80002ecc40c8,3,fffffd807f7d77b8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a2234a8,fffffd80677fd958,fffffd807f7d77b8,ffff80002ecc4198,ffff80002ecc4170) at ktrwriteraw+0x16b sys/kern/kern_ktrace.c:682
ktrstruct(ffff80002a2234a8,ffffffff8295a713,ffff80002ecc4350,20) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:645 [inline]
ktrstruct(ffff80002a2234a8,ffffffff8295a713,ffff80002ecc4350,20) at ktrstruct+0x169 sys/kern/kern_ktrace.c:308
sys_kevent(ffff80002a2234a8,ffff80002ecc45e0,ffff80002ecc4530) at sys_kevent+0x61d sys/kern/kern_event.c:1069
syscall(ffff80002ecc45e0) at syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline]
syscall(ffff80002ecc45e0) at syscall+0x8cf sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2930986c0, 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 50375c3b-e826-8a7e-06ca-b163c863336b
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 0x000f27f0: 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 3.65
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