panic: invalid dst page 0xfffff8007e638f98 cpuid = 0 time = 1552689540 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0021277750 vpanic() at vpanic+0x1e0/frame 0xfffffe00212777b0 panic() at panic+0x43/frame 0xfffffe0021277810 vm_fault_copy_entry() at vm_fault_copy_entry+0x808/frame 0xfffffe00212778d0 vm_map_protect() at vm_map_protect+0x5f9/frame 0xfffffe0021277940 sys_mprotect() at sys_mprotect+0xcc/frame 0xfffffe0021277980 amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe0021277ab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0021277ab0 --- syscall (198, FreeBSD ELF64, nosys), rip = 0x412e5a, rsp = 0x7fffdffdcf38, rbp = 0x3 --- KDB: enter: panic [ thread pid 796 tid 100137 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why