panic: vm_object_vndeallocate: bad object reference count
cpuid = 1
time = 11
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe00212f9730
vpanic() at vpanic+0x1e0/frame 0xfffffe00212f9790
panic() at panic+0x43/frame 0xfffffe00212f97f0
vm_object_collapse() at vm_object_collapse/frame 0xfffffe00212f9850
vm_map_process_deferred() at vm_map_process_deferred+0xf6/frame 0xfffffe00212f9880
vm_map_remove() at vm_map_remove+0x11f/frame 0xfffffe00212f98c0
vmspace_exit() at vmspace_exit+0x146/frame 0xfffffe00212f9900
exit1() at exit1+0x86c/frame 0xfffffe00212f9970
sys_sys_exit() at sys_sys_exit+0xd/frame 0xfffffe00212f9980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe00212f9ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00212f9ab0
--- syscall (1, FreeBSD ELF64, sys_sys_exit), rip = 0x44f54a, rsp = 0x7fffffffec58, rbp = 0x1 ---
KDB: enter: panic
[ thread pid 1369 tid 100708 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why