Comment 9 for bug 1190344

I needed to run it with sudo.

Every time I switch to Guest Session, logout, and then switch back to the first user, I notice two more pipes open.

$ sudo lsof -p 1055 | grep FIFO
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1000/gvfs
      Output information may be incomplete.
lightdm 1055 root 4r FIFO 0,8 0t0 12349 pipe
lightdm 1055 root 5w FIFO 0,8 0t0 12349 pipe
lightdm 1055 root 13w FIFO 0,8 0t0 11794 pipe
lightdm 1055 root 14r FIFO 0,8 0t0 11795 pipe
lightdm 1055 root 15w FIFO 0,8 0t0 12546 pipe
lightdm 1055 root 16r FIFO 0,8 0t0 12547 pipe
lightdm 1055 root 18w FIFO 0,8 0t0 1244475 pipe
lightdm 1055 root 19r FIFO 0,8 0t0 1244476 pipe
lightdm 1055 root 20w FIFO 0,8 0t0 1257093 pipe
lightdm 1055 root 21r FIFO 0,8 0t0 1257094 pipe
lightdm 1055 root 22w FIFO 0,8 0t0 1316710 pipe
lightdm 1055 root 23r FIFO 0,8 0t0 1316711 pipe
lightdm 1055 root 24w FIFO 0,8 0t0 1332415 pipe
lightdm 1055 root 25r FIFO 0,8 0t0 1332416 pipe
lightdm 1055 root 26w FIFO 0,8 0t0 1351976 pipe
lightdm 1055 root 27r FIFO 0,8 0t0 1351977 pipe
lightdm 1055 root 28w FIFO 0,8 0t0 1369466 pipe
lightdm 1055 root 29r FIFO 0,8 0t0 1369467 pipe