I'm having a similar issue. Not sure if it's the same bug or not, as my logs are slightly different. I installed 18.04 on a new ssd two days ago. Each time I come back to my machine after leaving it idle, I find my harddrive is full, and syslog has grown to 9-10GB. The repeating entry looks like: Jun 13 00:07:19 meeks gnome-shell[2506]: Object St.BoxLayout (0x556792695850), has been already finalized. Impossible to set any property to it. Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #3 0x7ffd398e1520 I resource:///org/gnome/gjs/modules/signals.js:128 (0x7f741c3d3230 @ 386) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #4 0x556790948430 i resource:///org/gnome/shell/ui/layout.js:531 (0x7f741c2042b8 @ 127) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #5 0x7ffd398e2130 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7f741c3b5de0 @ 71) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #6 0x7ffd398e2130 I self-hosted:915 (0x7f741c3f12b8 @ 367) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: == Stack trace for context 0x5567905a0340 == Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #0 0x7ffd398e1420 b resource:///org/gnome/shell/ui/osdWindow.js:207 (0x7f741c2c96f8 @ 258) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #1 0x7ffd398e1490 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7f741c3b5de0 @ 71) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #2 0x7ffd398e1490 I self-hosted:915 (0x7f741c3f12b8 @ 367) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #3 0x7ffd398e1520 I resource:///org/gnome/gjs/modules/signals.js:128 (0x7f741c3d3230 @ 386) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #4 0x556790948430 i resource:///org/gnome/shell/ui/layout.js:531 (0x7f741c2042b8 @ 127) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #5 0x7ffd398e2130 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7f741c3b5de0 @ 71) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #6 0x7ffd398e2130 I self-hosted:915 (0x7f741c3f12b8 @ 367) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: == Stack trace for context 0x5567905a0340 == Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #0 0x7ffd398e1420 b resource:///org/gnome/shell/ui/osdWindow.js:206 (0x7f741c2c96f8 @ 231) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #1 0x7ffd398e1490 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7f741c3b5de0 @ 71) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #2 0x7ffd398e1490 I self-hosted:915 (0x7f741c3f12b8 @ 367) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #3 0x7ffd398e1520 I resource:///org/gnome/gjs/modules/signals.js:128 (0x7f741c3d3230 @ 386) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #4 0x556790948430 i resource:///org/gnome/shell/ui/layout.js:531 (0x7f741c2042b8 @ 127) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #5 0x7ffd398e2130 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7f741c3b5de0 @ 71) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #6 0x7ffd398e2130 I self-hosted:915 (0x7f741c3f12b8 @ 367) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: == Stack trace for context 0x5567905a0340 == Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #0 0x7ffd398e1420 b resource:///org/gnome/shell/ui/osdWindow.js:207 (0x7f741c2c96f8 @ 258) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #1 0x7ffd398e1490 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7f741c3b5de0 @ 71) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #2 0x7ffd398e1490 I self-hosted:915 (0x7f741c3f12b8 @ 367) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #3 0x7ffd398e1520 I resource:///org/gnome/gjs/modules/signals.js:128 (0x7f741c3d3230 @ 386) At the top, there's also this stuff one time: Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): EDID vendor "HWP", prod id 12288 Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Using hsync ranges from config file Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Using vrefresh ranges from config file Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Printing DDC gathered Modelines: Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1600x900"x0.0 108.00 1600 1624 1704 1800 900 901 904 1000 +hsync +vsync (60.0 kHz eP) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1600x900"x60.0 119.00 1600 1696 1864 2128 900 901 904 932 -hsync +vsync (55.9 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1280x720"x60.0 74.48 1280 1336 1472 1664 720 721 724 746 -hsync +vsync (44.8 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): EDID vendor "HWP", prod id 12288 Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Using hsync ranges from config file Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Using vrefresh ranges from config file Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Printing DDC gathered Modelines: Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1600x900"x0.0 108.00 1600 1624 1704 1800 900 901 904 1000 +hsync +vsync (60.0 kHz eP) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1600x900"x60.0 119.00 1600 1696 1864 2128 900 901 904 932 -hsync +vsync (55.9 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1280x720"x60.0 74.48 1280 1336 1472 1664 720 721 724 746 -hsync +vsync (44.8 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Allocate new frame buffer 3520x1080 stride Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): EDID vendor "HWP", prod id 12288 Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Using hsync ranges from config file Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Using vrefresh ranges from config file Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Printing DDC gathered Modelines: Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1600x900"x0.0 108.00 1600 1624 1704 1800 900 901 904 1000 +hsync +vsync (60.0 kHz eP) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1600x900"x60.0 119.00 1600 1696 1864 2128 900 901 904 932 -hsync +vsync (55.9 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e) Jun 13 00:07:17 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1280x720"x60.0 74.48 1280 1336 1472 1664 720 721 724 746 -hsync +vsync (44.8 kHz e) Jun 13 00:07:19 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): EDID vendor "HWP", prod id 12288 Jun 13 00:07:19 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Using hsync ranges from config file Jun 13 00:07:19 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Using vrefresh ranges from config file Jun 13 00:07:19 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Printing DDC gathered Modelines: Jun 13 00:07:19 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1600x900"x0.0 108.00 1600 1624 1704 1800 900 901 904 1000 +hsync +vsync (60.0 kHz eP) Jun 13 00:07:19 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "800x600"x0.0 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync (37.9 kHz e) Jun 13 00:07:19 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "640x480"x0.0 25.18 640 656 752 800 480 490 492 525 -hsync -vsync (31.5 kHz e) Jun 13 00:07:19 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "720x400"x0.0 28.32 720 738 846 900 400 412 414 449 -hsync +vsync (31.5 kHz e) Jun 13 00:07:19 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1024x768"x0.0 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync (48.4 kHz e) Jun 13 00:07:19 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1600x900"x60.0 119.00 1600 1696 1864 2128 900 901 904 932 -hsync +vsync (55.9 kHz e) Jun 13 00:07:19 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1280x1024"x0.0 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync (64.0 kHz e) Jun 13 00:07:19 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1440x900"x0.0 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync (55.9 kHz e) Jun 13 00:07:19 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Modeline "1280x720"x60.0 74.48 1280 1336 1472 1664 720 721 724 746 -hsync +vsync (44.8 kHz e) Jun 13 00:07:19 meeks /usr/lib/gdm3/gdm-x-session[2361]: (II) modeset(0): Allocate new frame buffer 3600x1980 stride Jun 13 00:07:19 meeks gnome-shell[2506]: Object St.Icon (0x5567911e37b0), has been already finalized. Impossible to set any property to it. Jun 13 00:07:19 meeks gnome-shell[2506]: Object St.BoxLayout (0x5567911e3f10), has been already finalized. Impossible to set any property to it. Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: == Stack trace for context 0x5567905a0340 == Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #0 0x7ffd398e1420 b resource:///org/gnome/shell/ui/osdWindow.js:206 (0x7f741c2c96f8 @ 231) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #1 0x7ffd398e1490 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7f741c3b5de0 @ 71) Jun 13 00:07:19 meeks org.gnome.Shell.desktop[2506]: #2 0x7ffd398e1490 I self-hosted:915 (0x7f741c3f12b8 @ 367)