panic: trap type 6, code=2, pc=ffffffff8339ce72
Starting stack trace...
panic(ffffffff8348205d) at panic+0x1d0 sys/kern/subr_prf.c:229
kerntrap(ffff80002a2b3bd0) at kerntrap+0x30b
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
memset() at memset+0x52
ffs_write(ffff80002a2b3ef0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806d7c18b0,ffff80002a2b3f80,0,fffffd80097fd410) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
uvn_io(fffffd8075297968,ffff80002a2b4100,1,39,1) at uvn_io+0x498 sys/uvm/uvm_vnode.c:1232
uvm_pager_put(fffffd8075297968,fffffd800895c338,ffff80002a2b41a0,ffff80002a2b41c4,39,0,414156cfa3591743) at uvm_pager_put+0x10a sys/uvm/uvm_pager.c:505
uvn_flush(fffffd8075297968,0,0,19) at uvn_flush+0x690 sys/uvm/uvm_vnode.c:705
uvn_detach(fffffd8075297968) at uvn_detach+0xcf sys/uvm/uvm_vnode.c:344
uvm_unmap_detach(ffff80002a2b42d0,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1370
uvm_map_teardown(fffffd806ea1cb80) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2536
exit1(ffff80002a242540,43,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260
sys_exit(ffff80002a242540,ffff80002a2b44a0,ffff80002a2b43f0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80002a2b44a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a2b44a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x743af54a1990, count: 241
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 2c48b237-609e-0a7d-d6ca-08d70f46a694
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 0x000f26f0: 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>