panic: pmap_demote_pde: page table page for a wired mapping is missing
cpuid = 0
time = 2350
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0020d895a0
vpanic() at vpanic+0x1e0/frame 0xfffffe0020d89600
panic() at panic+0x43/frame 0xfffffe0020d89660
pmap_demote_pde_locked() at pmap_demote_pde_locked+0x1288/frame 0xfffffe0020d89730
pmap_enter() at pmap_enter+0x755/frame 0xfffffe0020d89810
vm_fault_copy_entry() at vm_fault_copy_entry+0x589/frame 0xfffffe0020d898d0
vm_map_protect() at vm_map_protect+0x5f9/frame 0xfffffe0020d89940
sys_mprotect() at sys_mprotect+0xcc/frame 0xfffffe0020d89980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe0020d89ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0020d89ab0
--- syscall (198, FreeBSD ELF64, nosys), rip = 0x412e5a, rsp = 0x7fffdfffdf38, rbp = 0x3 ---
KDB: enter: panic
[ thread pid 4613 tid 100826 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why