panic: pmap_demote_pde: page table page for a wired mapping is missing
cpuid = 1
time = 9
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe001f5d4680
vpanic() at vpanic+0x1e0/frame 0xfffffe001f5d46e0
panic() at panic+0x43/frame 0xfffffe001f5d4740
pmap_demote_pde_locked() at pmap_demote_pde_locked+0x1288/frame 0xfffffe001f5d4810
pmap_protect() at pmap_protect+0x687/frame 0xfffffe001f5d48d0
vm_map_protect() at vm_map_protect+0x666/frame 0xfffffe001f5d4940
sys_mprotect() at sys_mprotect+0xcc/frame 0xfffffe001f5d4980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe001f5d4ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe001f5d4ab0
--- syscall (198, FreeBSD ELF64, nosys), rip = 0x412e5a, rsp = 0x7fffdfffdf38, rbp = 0x3 ---
KDB: enter: panic
[ thread pid 18336 tid 100443 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why