panic: assertion "obj != NULL" failed in vm_object_hold_shared at /usr/src/sys/vm/vm_object.c:330
cpuid = 1
Trace beginning at frame 0xfffff8011845f118
vm_object_hold_shared() at vm_object_hold_shared+0x3f 0xffffffff809ab9bf
vm_object_hold_shared() at vm_object_hold_shared+0x3f 0xffffffff809ab9bf
vm_fault() at vm_fault+0x408 0xffffffff8099e0b8
trap_pfault() at trap_pfault+0x9a 0xffffffff80bd52ca
trap() at trap+0x17c 0xffffffff80bd5bcc
calltrap() at calltrap+0x9 0xffffffff80b991fa
--- trap 000000000000000c, rip = ffffffff80bca670, rsp = fffff8011845f530, rbp = fffff8011845f5e8 ---
memset() at memset+0xf0 0xffffffff80bca670
Debugger("panic")

CPU1 stopping CPUs: 0x3d
 stopped
Stopped at      Debugger+0x7c:  movb   $0,0xbdaf09(%rip)
db>