Comment 13 for bug 2049695

I was able to reproduce the issue again, even with my fix.

And this time unmounting the /dev of the chroot is not even possible after the build. So I ran fuser and based on the result it looks like at some point the real /dev of my machine was mounted.

 % sudo fuser -v -m /home/paul/scratch/edubuntu-pi-arm64/chroot/dev/
                     USER PID ACCESS COMMAND
/home/paul/scratch/edubuntu-pi-arm64/chroot/dev:
                     root kernel swap /dev/dm-1
                     root kernel mount /dev
                     root 110 .rc.. kdevtmpfs
                     root 6159 f.... lxd
                     paul 6996 ....m pulseaudio
                     paul 7125 ....m Xorg
                     paul 7270 ....m gsd-xsettings
                     paul 7274 ....m gsd-power
                     paul 7285 ....m gsd-color
                     paul 7288 ....m gnome-flashback
                     paul 7315 ....m gsd-keyboard
                     paul 7316 ....m gsd-wacom
                     paul 7319 ....m gsd-media-keys
                     paul 7691 ....m picom
                     paul 7937 ....m mattermost-desk
                     paul 7954 ....m xdg-desktop-por
                     paul 10083 ....m Vivaldi-Gpu
                     messagebus 490522 F.... dbus-daemon
                     messagebus 490530 F.... gvfsd
                     messagebus 490539 F.... gvfsd-fuse
                     messagebus 490551 F.... dconf-service

I do not understand how this is possible.