devuaf: loaded dev=0xfffff80116a0ef80 pgA=0xfffff80116949000 pgB=0xfffff8011694a000
devuaf: SWAP old=0xfffff80116a0ef80 new=0xfffff8004f2a7c80 reused=0 (cpu 0)
devuaf: SWAP old=0xfffff8004f2a7c80 new=0xfffff8004f2a7c80 reused=1 (cpu 1)
panic: assertion "dev->si_object" failed in old_dev_pager_dtor at /usr/src/sys/vm/device_pager.c:343
cpuid = 1
Trace beginning at frame 0xfffff8011814d6f8
old_dev_pager_dtor() at old_dev_pager_dtor+0x4d 0xffffffff80996d8d
old_dev_pager_dtor() at old_dev_pager_dtor+0x4d 0xffffffff80996d8d
dev_pager_dealloc() at dev_pager_dealloc+0x36 0xffffffff80996e56
vm_object_terminate() at vm_object_terminate+0x11e 0xffffffff809ac22e
vm_object_deallocate() at vm_object_deallocate+0x85 0xffffffff809ac7a5
vm_map_entry_dispose.isra.15() at vm_map_entry_dispose.isra.15+0xbf 0xffffffff809a1c1f
Debugger("panic")

CPU1 stopping CPUs: 0x0000003d
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db>