panic: trap type 4, code=0, pc=ffffffff81580c35
Starting stack trace...
panic(ffffffff825a0d51) at panic+0x16b sys/kern/subr_prf.c:229
kerntrap(ffff80002e4b5020) at kerntrap+0x1c7 sys/arch/amd64/amd64/trap.c:313
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
pool_do_put(ffffffff82a27a80,fffffd80745f4200) at pool_do_put+0x115
pool_put(ffffffff82a27a80,fffffd80745f4200) at pool_put+0x8b sys/kern/subr_pool.c:799
soclose(fffffd80745f4200,0) at soclose+0x4ba sys/kern/uipc_socket.c:432
soo_close(fffffd8063ff6430,ffff80002e4c7a50) at soo_close+0x40
fdrop(fffffd8063ff6430,ffff80002e4c7a50) at fdrop+0xc7 sys/kern/kern_descrip.c:1274
closef(fffffd8063ff6430,ffff80002e4c7a50) at closef+0x11c sys/kern/kern_descrip.c:1258
fdfree(ffff80002e4c7a50) at fdfree+0xe4 sys/kern/kern_descrip.c:1190
exit1(ffff80002e4c7a50,0,0,1) at exit1+0x37d sys/kern/kern_exit.c:196
sys_exit(ffff80002e4c7a50,ffff80002e4b5410,ffff80002e4b5460) at sys_exit+0x16 sys/kern/kern_exit.c:89
syscall(ffff80002e4b54e0) at syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff80002e4b54e0) at syscall+0x435 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffff80dd0, count: 243
End of stack trace.
syncing disks...32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32  giving up

dump to dev 4,1 not possible
rpebaonoitci: nkge.r.n.el
 diagnostic 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 5539092a-1476-82b6-0a34-88b96a0f4c53
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 0x000f24c0: 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> show malloc
boot: illegal argument malloc
boot> show all pools
boot> machine ddbcpu 0
machine: syntax error
boot> trace
boot> machine ddbcpu 1
machine: syntax error
boot> trace