I can confirm that this bug still exists in 18.04.
In my case in a completely fresh install with nothing added / configured
except for chromium being installed (and packages updated).
Installed Friday afternoon and came back in to work Monday to find the
disk full as per the original report.
I can also confirm that this is lock-screen related as it starts logging
as soon as the screen is locked and stops when un-locked.
No notifications are evident.
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Reinstalled the same NUC with 18.10, installed package updates &
rebooted.
Relevant syslog attached, detail starts at timestamp Oct 29 15:32:28
when installation was locked.
The stack traces appear to occur every 10 seconds once locked when
checking the output of "grep osdWindow.js syslog".
With some digging on the gnome gitlab i've actually found what looks
like an existing bug report:
https://gitlab.gnome.org/GNOME/gnome-shell/issues/602
Looks like a fix was merged https://gitlab.gnome.org/GNOME/gnome-
shell/merge_requests/243 a week ago.
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