panic: kernel diagnostic assertion "uvm_page_owner_locked_p(pg, TRUE)" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1248
Starting stack trace...
panic(ffffffff8311d783) at panic+0x1ba sys/kern/subr_prf.c:229
__assert(ffffffff830d7289,ffffffff83025989,4e0,ffffffff8305b6f1) at __assert+0x29
uvm_pageunwire(fffffd80074f6a80) at uvm_pageunwire+0x1dd sys/uvm/uvm_page.c:1248
uvm_fault_unwire_locked(fffffd806c1e8cb8,c611ab55000,c611af54000) at uvm_fault_unwire_locked+0x33c sys/uvm/uvm_fault.c:1774
uvm_unmap_kill_entry_withlock(fffffd806c1e8cb8,fffffd805f410eb0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1860
uvm_map_teardown(fffffd806c1e8cb8) at uvm_map_teardown+0x1c7 sys/uvm/uvm_map.c:2496
uvmspace_free(fffffd806c1e8cb8) at uvmspace_free+0xbd sys/uvm/uvm_map.c:3420
reaper(ffff80002a837be0) at reaper+0x225 sys/kern/kern_exit.c:478
end trace frame: 0x0, count: 249
End of stack trace.
syncing disks...39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39  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 1f64d870-06f2-d8bf-7327-adc6877a2997
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 0x000f27d0: 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