panic: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1248
Starting stack trace...
panic(ffffffff830b6ace) at panic+0x1ba sys/kern/subr_prf.c:229
__assert(ffffffff83069aeb,ffffffff82fb9fdd,4e0,ffffffff830bd64a) at __assert+0x29
uvm_pageunwire(fffffd8007132300) at uvm_pageunwire+0x1dd sys/uvm/uvm_page.c:1248
uvm_fault_unwire_locked(fffffd8078238970,45b8cb78000,45b8cb79000) at uvm_fault_unwire_locked+0x33e sys/uvm/uvm_fault.c:1695
uvm_unmap_kill_entry_withlock(fffffd8078238970,fffffd806b49e7e0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1861
uvm_map_teardown(fffffd8078238970) at uvm_map_teardown+0x1c7 sys/uvm/uvm_map.c:2498
uvmspace_free(fffffd8078238970) at uvmspace_free+0xbd sys/uvm/uvm_map.c:3422
reaper(ffff80002a4571c0) at reaper+0x225 sys/kern/kern_exit.c:478
end trace frame: 0x0, count: 249
End of stack trace.
syncing disks...5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5  giving up

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 860ebdd0-427f-2be6-5726-fd56b385017a
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> machine ddbcpu 0
machine: syntax error
boot> trace
|/-\|/-\|/booting hd0a:trace: -\|/open hd0a:trace: No such file or directory
 failed(2). will try /bsd
boot> machine ddbcpu 1
machine: syntax error
boot> trace