panic: vm_pager_assert_in: page 0xfffff8007cf1e000 is mapped
cpuid = 0
time = 1557773258
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe0021321370
vpanic() at vpanic+0x1e0/frame 0xfffffe00213213d0
panic() at panic+0x43/frame 0xfffffe0021321430
vm_pager_assert_in() at vm_pager_assert_in+0x198/frame 0xfffffe0021321480
vm_pager_get_pages() at vm_pager_get_pages+0x3e/frame 0xfffffe00213214e0
vm_fault_hold() at vm_fault_hold+0x101b/frame 0xfffffe0021321650
vm_fault() at vm_fault+0xad/frame 0xfffffe0021321690
vm_map_wire_locked() at vm_map_wire_locked+0x72a/frame 0xfffffe0021321770
vm_mmap_object() at vm_mmap_object+0x5ef/frame 0xfffffe00213217f0
vn_mmap() at vn_mmap+0x287/frame 0xfffffe0021321890
kern_mmap() at kern_mmap+0x8a8/frame 0xfffffe0021321950
sys_mmap() at sys_mmap+0x38/frame 0xfffffe0021321980
amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe0021321ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0021321ab0
--- syscall (198, FreeBSD ELF64, nosys), rip = 0x41309a, rsp = 0x7fffdfffdf38, rbp = 0x6 ---
KDB: enter: panic
[ thread pid 1247 tid 100664 ]
Stopped at      kdb_enter+0x6a: movq    $0,kdb_why