panic: pmap_remove_ptes: unmanaged page marked PG_PVLIST: va 0x4d0c4816000, opte 0xffffffffffffffff
Starting stack trace...
panic(ffffffff828c2c44) at panic+0x159 sys/kern/subr_prf.c:229
pmap_remove_ptes(fffffd806d248968,fffffd8006e62680,7f82686240b0,4d0c4816000,4d0c4856000,0,5107ab7c1406029c) at pmap_remove_ptes+0x33e
pmap_do_remove(fffffd806d248968,4d0c4816000,4d0c4856000,0) at pmap_do_remove+0x427 sys/arch/amd64/amd64/pmap.c:1896
uvm_unmap_kill_entry_withlock(fffffd806b00c998,fffffd80697fe588,0) at uvm_unmap_kill_entry_withlock+0x1a7 sys/uvm/uvm_map.c:1897
uvm_map_teardown(fffffd806b00c998) at uvm_map_teardown+0x157 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
uvm_map_teardown(fffffd806b00c998) at uvm_map_teardown+0x157 sys/uvm/uvm_map.c:2534
uvmspace_free(fffffd806b00c998) at uvmspace_free+0x96 sys/uvm/uvm_map.c:3461
reaper(ffff80002a5d6cd8) at reaper+0x15a sys/kern/kern_exit.c:463
end trace frame: 0x0, count: 250
End of stack trace.
syncing disks...panic: ffs_update: bad link cnt
Starting stack trace...
panic(ffffffff828baa80) at panic+0x159 sys/kern/subr_prf.c:229
ffs_update(fffffd806ec97010,0) at ffs_update+0x2da sys/ufs/ffs/ffs_inode.c:99
VOP_FSYNC(fffffd8068883440,fffffd807f7d7dd0,2,ffff80002a5d6cd8) at VOP_FSYNC+0xc9 sys/kern/vfs_vops.c:311
ffs_sync_vnode(fffffd8068883440,ffff80002a5d5838) at ffs_sync_vnode+0x16b sys/ufs/ffs/ffs_vfsops.c:1081
vfs_mount_foreach_vnode(ffff8000006c7800,ffffffff827bfd40,ffff80002a5d5838) at vfs_mount_foreach_vnode+0x55 sys/kern/vfs_subr.c:910
ffs_sync(ffff8000006c7800,2,0,fffffd807f7d7dd0,ffff80002a5d6cd8) at ffs_sync+0x104 sys/ufs/ffs/ffs_vfsops.c:1131
sys_sync(ffff80002a5d6cd8,0,0) at sys_sync+0xbc sys/kern/vfs_syscalls.c:536
vfs_syncwait(ffff80002a5d6cd8,1) at vfs_syncwait+0x3b
vfs_shutdown(ffff80002a5d6cd8) at vfs_shutdown+0x61 sys/kern/vfs_subr.c:1791
boot(100) at boot+0xe0 sys/arch/amd64/amd64/machdep.c:903
reboot(100) at reboot+0x7b
panic(ffffffff828c2c44) at panic+0x179 sys/kern/subr_prf.c:231
pmap_remove_ptes(fffffd806d248968,fffffd8006e62680,7f82686240b0,4d0c4816000,4d0c4856000,0,5107ab7c1406029c) at pmap_remove_ptes+0x33e
pmap_do_remove(fffffd806d248968,4d0c4816000,4d0c4856000,0) at pmap_do_remove+0x427 sys/arch/amd64/amd64/pmap.c:1896
uvm_unmap_kill_entry_withlock(fffffd806b00c998,fffffd80697fe588,0) at uvm_unmap_kill_entry_withlock+0x1a7 sys/uvm/uvm_map.c:1897
uvm_map_teardown(fffffd806b00c998) at uvm_map_teardown+0x157 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
uvm_map_teardown(fffffd806b00c998) at uvm_map_teardown+0x157 sys/uvm/uvm_map.c:2534
uvmspace_free(fffffd806b00c998) at uvmspace_free+0x96 sys/uvm/uvm_map.c:3461
reaper(ffff80002a5d6cd8) at reaper+0x15a sys/kern/kern_exit.c:463
end trace frame: 0x0, count: 239
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 0fee9609-1d66-d0cb-3385-b9d53e0469ef
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 0x000f27f0: 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