panic: trap type 6, code=10, pc=0
Starting stack trace...
panic(ffffffff827782a4) at panic+0x159 sys/kern/subr_prf.c:229
kerntrap(ffff800030eeb470) at kerntrap+0x1c7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
0(fffffd805efb7f00,fffffd805efb7f00,0,fffffd805efb7f00,dbc,0) at 0
softclock_process_kclock_timeout(fffffd805efb7f00,0) at softclock_process_kclock_timeout+0x1ca sys/kern/kern_timeout.c:695
softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:754
softintr_dispatch(0) at softintr_dispatch+0xd1 sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x27
free(ffff800000f9e000,7f,10000) at free+0x223 sys/kern/kern_malloc.c:429
ufs_readdir(ffff800030eeb960) at ufs_readdir+0x366 sys/ufs/ufs/ufs_vnops.c:1477
VOP_READDIR(fffffd8054942390,ffff800030eeb9e0,fffffd807f7d78f0,ffff800030eeba24) at VOP_READDIR+0xc3 sys/kern/vfs_vops.c:444
sys_getdents(ffff80002c152ab0,ffff800030eebaa0,ffff800030eebaf0) at sys_getdents+0x20f sys/kern/vfs_syscalls.c:3143
syscall(ffff800030eebb60) at syscall+0x543 sys/arch/amd64/amd64/trap.c:606
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x71c13219b300, count: 243
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 8a8635c2-f252-d190-235a-0f50a6ed73cd
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 0x000f28a0: 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 $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