Public bug reported:

In bionic, my /var/log/syslog is being filled with gnome-shell crashes
related to tweener. Here is a sample:

Mar 13 11:04:58 nsnx org.gnome.Shell.desktop[5392]: == Stack trace for context 
0x558dbc896060 ==
Mar 13 11:04:58 nsnx org.gnome.Shell.desktop[5392]: #0 0x7ffcd5dd6530 b   
resource:///org/gnome/shell/ui/tweener.js:80 (0x7f74e80c7cd0 @ 82)
Mar 13 11:04:58 nsnx org.gnome.Shell.desktop[5392]: #1 0x7ffcd5dd65d0 b   
resource:///org/gnome/shell/ui/tweener.js:105 (0x7f74e80c7f78 @ 36)
Mar 13 11:04:58 nsnx org.gnome.Shell.desktop[5392]: #2 0x7ffcd5dd6670 b   
resource:///org/gnome/shell/ui/tweener.js:92 (0x7f74e80c7de0 @ 52)
Mar 13 11:04:58 nsnx org.gnome.Shell.desktop[5392]: #3 0x7ffcd5dd6730 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:203 (0x7f74e80d2918 @ 54)
Mar 13 11:04:58 nsnx org.gnome.Shell.desktop[5392]: #4 0x7ffcd5dd6880 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:332 (0x7f74e80d29a0 @ 1626)
Mar 13 11:04:58 nsnx org.gnome.Shell.desktop[5392]: #5 0x7ffcd5dd6930 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:345 (0x7f74e80d2a28 @ 100)
Mar 13 11:04:58 nsnx org.gnome.Shell.desktop[5392]: #6 0x7ffcd5dd69c0 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:360 (0x7f74e80d2ab0 @ 10)
Mar 13 11:04:58 nsnx org.gnome.Shell.desktop[5392]: #7 0x7ffcd5dd6a40 I   
resource:///org/gnome/gjs/modules/signals.js:126 (0x7f74e80cff78 @ 386)
Mar 13 11:04:58 nsnx org.gnome.Shell.desktop[5392]: #8 0x7ffcd5dd6af0 b   
resource:///org/gnome/shell/ui/tweener.js:207 (0x7f74e80cf5e8 @ 159)
Mar 13 11:04:58 nsnx gnome-shell[5392]: Object Clutter.Actor (0x558dbe8baf00), 
has been already finalized. Impossible to set any property to it.
Mar 13 11:04:58 nsnx org.gnome.Shell.desktop[5392]: #9 0x7ffcd5dd6b60 I   
resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7f74e80b4de0 @ 71)
Mar 13 11:04:58 nsnx org.gnome.Shell.desktop[5392]: #10 0x7ffcd5dd6b60 I   
resource:///org/gnome/shell/ui/tweener.js:182 (0x7f74e80cf560 @ 15)
Mar 13 11:04:59 nsnx gnome-shell[5392]: Object St.BoxLayout (0x558dbe96e050), 
has been already finalized. Impossible to get any property from it.
Mar 13 11:04:59 nsnx gnome-shell[5392]: Object St.BoxLayout (0x558dbe96e050), 
has been already finalized. Impossible to set any property to it.
Mar 13 11:04:59 nsnx org.gnome.Shell.desktop[5392]: == Stack trace for context 
0x558dbc896060 ==
Mar 13 11:04:59 nsnx org.gnome.Shell.desktop[5392]: #0 0x7ffcd5dd5680 b   
resource:///org/gnome/shell/ui/tweener.js:73 (0x7f74e80c7cd0 @ 9)
Mar 13 11:04:59 nsnx org.gnome.Shell.desktop[5392]: #1 0x7ffcd5dd5720 b   
resource:///org/gnome/shell/ui/tweener.js:105 (0x7f74e80c7f78 @ 36)
Mar 13 11:04:59 nsnx org.gnome.Shell.desktop[5392]: #2 0x7ffcd5dd57c0 b   
resource:///org/gnome/shell/ui/tweener.js:92 (0x7f74e80c7de0 @ 52)
Mar 13 11:04:59 nsnx org.gnome.Shell.desktop[5392]: #3 0x7ffcd5dd6730 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:203 (0x7f74e80d2918 @ 54)
Mar 13 11:04:59 nsnx org.gnome.Shell.desktop[5392]: #4 0x7ffcd5dd6880 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:332 (0x7f74e80d29a0 @ 1626)
Mar 13 11:04:59 nsnx org.gnome.Shell.desktop[5392]: #5 0x7ffcd5dd6930 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:345 (0x7f74e80d2a28 @ 100)
Mar 13 11:04:59 nsnx org.gnome.Shell.desktop[5392]: #6 0x7ffcd5dd69c0 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:360 (0x7f74e80d2ab0 @ 10)
Mar 13 11:04:59 nsnx org.gnome.Shell.desktop[5392]: #7 0x7ffcd5dd6a40 I   
resource:///org/gnome/gjs/modules/signals.js:126 (0x7f74e80cff78 @ 386)
Mar 13 11:04:59 nsnx org.gnome.Shell.desktop[5392]: #8 0x7ffcd5dd6af0 b   
resource:///org/gnome/shell/ui/tweener.js:207 (0x7f74e80cf5e8 @ 159)
Mar 13 11:04:59 nsnx org.gnome.Shell.desktop[5392]: #9 0x7ffcd5dd6b60 I   
resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7f74e80b4de0 @ 71)
Mar 13 11:04:59 nsnx org.gnome.Shell.desktop[5392]: #10 0x7ffcd5dd6b60 I   
resource:///org/gnome/shell/ui/tweener.js:182 (0x7f74e80cf560 @ 15)

It is really filling up. tail -f gives you a live presentation:
root@nsnx:~# grep -E "gnome\.Shell.*Stack trace for context.*" 
/var/log/syslog|wc -l
1061


Packages:
ii  gnome-shell                                3.27.92-0ubuntu1                 
         amd64        graphical shell for the GNOME desktop
ii  gnome-shell-common                         3.27.92-0ubuntu1                 
         all          common files for the GNOME graphical shell
ii  gnome-shell-extension-appindicator         18.04                            
         all          App indicators for GNOME Shell
ii  gnome-shell-extension-ubuntu-dock          0.9                              
         all          Ubuntu Dock for GNOME Shell

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: Confirmed

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https://bugs.launchpad.net/bugs/1755484

Title:
  lots of "tweener" backtraces

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