This is due to the gvfs-gphoto2-volume-monitor process.
Run ps aux | grep gphoto and kill the process using sudo kill -9 <pid>.

./setup.sh

• meson compile -C builddir/arm
  or
• meson compile -C builddir/debug

1. Change host name to cameracontroller in /etc/hosts
2. Change host name to cameracontroller in /etc/hostname
3. Apply changes with sudo /etc/init.d/hostname.sh
4. Set publish-workstation=yes in /etc/avahi/avahi-daemon.conf

See https://github.com/abhiTronix/raspberry-pi-cross-compilers

Run scripts/do_rsync in a desired folder (eg. /opt/cross-pi-gcc-10.3.0-1) (remember to update ssh username and key path)