What does "?" means in ls -l output?

I saw a few files/dir are inaccessible even to the root user: find: ‘/run/user/1000/gvfs’: Permission denied. So I went a level deeper and ran ls -l; below is the output. /run/user/125# ll ls: cannot access 'gvfs': Permission denied total 4 drwx------ 12 gdm gdm 340 Sep 3 10:20 ./ drwxr-xr-x 4 root root 80 Sep 3 10:19 ../ srw-rw-rw- 1 gdm gdm 0 Sep 3 10:19 bus= drwx------ 3 gdm gdm 60 Sep 3 10:19 dbus-1/ drwx------ 2 gdm gdm 60 Sep 3 10:19 dconf/ drwx--x--x 2 gdm gdm 60 Sep 3 10:19 gdm/ prw-rw-r-- 1 gdm gdm 0 Sep 3 10:19 gnome-session-leader-fifo| drwx------ 3 gdm gdm 60 Sep 3 10:19 gnome-shell/ drwx------ 2 gdm gdm 140 Sep 3 10:19 gnupg/ d????????? ? ? ? ? ? gvfs/ -rw------- 1 gdm gdm 318 Sep 3 10:19 ICEauthority d--------- 3 gdm gdm 160 Sep 3 10:19 inaccessible/ drwx------ 2 gdm gdm 100 Sep 3 10:19 keyring/ srw-rw-rw- 1 gdm gdm 0 Sep 3 10:19 pk-debconf-socket= drwx------ 2 gdm gdm 80 Sep 3 10:19 pulse/ srw-rw-rw- 1 gdm gdm 0 Sep 3 10:19 snapd-session-agent.socket= drwxr-xr-x 3 gdm gdm 100 Sep 3 10:19 systemd/ Why do we see ? against file/dir gvfs?