io.elementary.wingpanel.desktop output to /var/log/syslog FILLS root partition, can't log back in without deleting /var/log/syslog

[stradicat]

Prerequisites

• [x] I have searched open and closed issues for duplicates.

Describe the bug

After automaticaly locking screen according to energy saving configuration, io.elementary.wingpanel.desktop silently outputs an error to /var/log/syslog, FILLING the root partition completely in a matter of minutes. This renders the system unusable, with high risk of data loss. It's also not possible to log back in without deleting /var/log/syslog (4+Gb last time.)

To Reproduce

Steps to reproduce the behavior:

1. Configure the OS to suspend screen after 15 minutes of inactivity
2. Wait for 15 minutes to suspend the screen, then a couple of minutes for io.elementary.wingpanel.desktop to begin logging
3. Log back in
4. Open a Terminal window and then htop
5. Check the top CPU activity: systemd-journald and rsyslogd are at 100+%
6. Check available disk space with df -h periodically; focus on / or wherever the /var partition is configured
7. Watch the top right corner for system notifications until a warning about low space on root partition shows up

Expected behavior

Absolutely nothing.

Screenshots or screen recordings

Not applicable at the moment.

Logs

May  9 18:07:45 ThinkPad io.elementary.wingpanel.desktop[3225]: [00007f83580c1fd0] vdpau_chroma filter error: video mixer rendering failure: An invalid handle value was provided.
May  9 18:07:45 ThinkPad io.elementary.wingpanel.desktop[3225]: [00007f83580c1fd0] vdpau_chroma filter error: video mixer features failure: An invalid handle value was provided.
May  9 18:07:45 ThinkPad io.elementary.wingpanel.desktop[3225]: [00007f83580c1fd0] vdpau_chroma filter error: video mixer attributes failure: An invalid handle value was provided.
May  9 18:07:45 ThinkPad io.elementary.wingpanel.desktop[3225]: [00007f83580c1fd0] vdpau_chroma filter error: video mixer rendering failure: An invalid handle value was provided.
May  9 18:07:45 ThinkPad io.elementary.wingpanel.desktop[3225]: [00007f83580c1fd0] vdpau_chroma filter error: video mixer features failure: An invalid handle value was provided.
May  9 18:07:45 ThinkPad io.elementary.wingpanel.desktop[3225]: [00007f83580c1fd0] vdpau_chroma filter error: video mixer attributes failure: An invalid handle value was provided.
May  9 18:07:45 ThinkPad io.elementary.wingpanel.desktop[3225]: [00007f83580c1fd0] vdpau_chroma filter error: video mixer rendering failure: An invalid handle value was provided.
May  9 18:07:45 ThinkPad io.elementary.wingpanel.desktop[3225]: [00007f83580c1fd0] vdpau_chroma filter error: video mixer features failure: An invalid handle value was provided.
May  9 18:07:45 ThinkPad io.elementary.wingpanel.desktop[3225]: [00007f83580c1fd0] vdpau_chroma filter error: video mixer attributes failure: An invalid handle value was provided.
May  9 18:07:45 ThinkPad io.elementary.wingpanel.desktop[3225]: [00007f83580c1fd0] vdpau_chroma filter error: video mixer rendering failure: An invalid handl

(truncated)

Platform Information

• OS: elementary OS
• OS Version: 5.1.4 Hera (fresh install, updated by May 9 2020)
• Hardware info:
  • ThinkPad T410s
  • Intel® Core™ i5 CPU, M 540 @ 2.53GHz
  • Video: NVIDIA Corporation GT218M [NVS 3100M] (rev a2)
  • Video driver: nvidia-340 (the only compatible proprietary driver for my onboard NVS3100M)
  • Kernel: 5.3.0-45-generic
  • Memory: 8Gb

• [ ] I'm using the latest version from git that I've manually compiled
• [x] I'm using the latest released stable version

Additional context

None at the moment

[stradicat]

Edit: VLC + NVidia driver seems to be the culprits https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-340/+bug/1846374

Closing.