panic: trap type 6, code=10, pc=0
Starting stack trace...
panic(ffffffff82fdd1ea) at panic+0x1d0 sys/kern/subr_prf.c:229
kerntrap(ffff800029fe5400) at kerntrap+0x29b sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
0(fffffd806a9e9f00,fffffd806a9e9f00,0,fffffd806a9e9f00,420,0) at 0
softclock_process_kclock_timeout(fffffd806a9e9f00,0) at softclock_process_kclock_timeout+0x2a2 sys/kern/kern_timeout.c:693
softclock(0) at softclock+0x199 sys/kern/kern_timeout.c:746
softintr_dispatch(0) at softintr_dispatch+0xf6 sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x27
__sanitizer_cov_trace_cmp8(ffff800029fe5778,fffffd80085b0300) at __sanitizer_cov_trace_cmp8
_rb_find(ffffffff832f5f10,fffffd805de45dd8,ffff800029fe5778) at _rb_find+0x68 sys/kern/subr_tree.c:450
uvm_pagelookup(fffffd805de45dc8,2ecf22000) at uvm_pagelookup+0x54 uvm_objtree_RBT_FIND sys/uvm/uvm_object.h:93 [inline]
uvm_pagelookup(fffffd805de45dc8,2ecf22000) at uvm_pagelookup+0x54 sys/uvm/uvm_page.c:1213
uvn_flush(fffffd805de45dc8,0,0,19) at uvn_flush+0x17b
uvn_detach(fffffd805de45dc8) at uvn_detach+0xcb sys/uvm/uvm_vnode.c:362
uvm_unmap_detach(ffff800029fe5a40,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364
uvm_map_teardown(fffffd806bf22528) at uvm_map_teardown+0x35e sys/uvm/uvm_map.c:2518
uvmspace_free(fffffd806bf22528) at uvmspace_free+0xcd sys/uvm/uvm_map.c:3422
reaper(ffff800029fd96d0) at reaper+0x246 sys/kern/kern_exit.c:481
end trace frame: 0x0, count: 240
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 f8e08a03-81bc-3227-53c0-939594373760
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 0x000f27c0: 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 $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