Comment 11 for bug 1764778

Can you please paste me the output of "mount -t cifs" on a system where this problem isn't happening?

Also, please paste the exact versions of cifs-utils in both cases and the running kernel.

As for a minimal reproducing case I'm trying to find, does this fail for you as one of these regular users (just a random dconf setting, harmless enough, to play with)

dconf write /org/gnome/rhythmbox/player/volume 1.0