I do not know why this was changed to invalid. This is a critical issue
that has clearly introduced a regression set of crashes.

(there MAY be confusing reports from other users for other issues, but I
can confirm the originally submitted report)

This isn't fun, several times per day a crash:
{{{
$ dmesg -T | grep seg
[Thu Nov  9 09:58:27 2017] gnome-shell[17846]: segfault at e8 ip 
00007fd954f6d6a2 sp 00007ffe04425eb8 error 4 in 
libgdk-3.so.0.1800.9[7fd954f30000+d4000]
[Thu Nov  9 10:11:16 2017] dota2[22006]: segfault at 0 ip 00007fef2866683a sp 
00007fff560539a0 error 6 in libtier0.so[7fef28630000+80000]
[Thu Nov  9 13:04:18 2017] gnome-shell[1356]: segfault at e8 ip 
00007f15ccddd6a2 sp 00007fff9ecf47f8 error 4 in 
libgdk-3.so.0.1800.9[7f15ccda0000+d4000]
[Thu Nov  9 17:16:45 2017] gnome-shell[14440]: segfault at e8 ip 
00007f196afdd6a2 sp 00007ffea13b5948 error 4 in 
libgdk-3.so.0.1800.9[7f196afa0000+d4000]
[Thu Nov  9 17:16:52 2017] dconf worker[18015]: segfault at 52c ip 
00000000004a133c sp 00007f351f7e6170 error 4 in perl[400000+1cf000]
[Thu Nov  9 20:35:24 2017] gnome-shell[32271]: segfault at e8 ip 
00007fd6ef0256a2 sp 00007ffebb0d3608 error 4 in 
libgdk-3.so.0.1800.9[7fd6eefe8000+d4000]
[Thu Nov  9 20:42:09 2017] gnome-shell[11070]: segfault at 23 ip 
00007fc2bd8687bf sp 00007fffcc3bc680 error 4 in 
libgnome-desktop-3.so.12.0.0[7fc2bd848000+39000]
[Thu Nov  9 23:13:09 2017] gnome-shell[24832]: segfault at 6 ip 
00007fb95e624818 sp 00007ffc656ced30 error 4 in 
libgio-2.0.so.0.4800.2[7fb95e560000+180000]
[Thu Nov  9 23:51:17 2017] gnome-shell[3253]: segfault at e8 ip 
00007f2d1f4756a2 sp 00007fff455b3128 error 4 in 
libgdk-3.so.0.1800.9[7f2d1f438000+d4000]
[Fri Nov 10 01:09:27 2017] gnome-shell[31134]: segfault at e8 ip 
00007f3b923756a2 sp 00007fff91dea558 error 4 in 
libgdk-3.so.0.1800.9[7f3b92338000+d4000]
[Fri Nov 10 01:12:43 2017] gnome-shell[9188]: segfault at e8 ip 
00007f683370d6a2 sp 00007ffffca20198 error 4 in 
libgdk-3.so.0.1800.9[7f68336d0000+d4000]
[Fri Nov 10 03:40:54 2017] gnome-shell[25978]: segfault at e8 ip 
00007f8af06ed6a2 sp 00007ffdf3c5cfc8 error 4 in 
libgdk-3.so.0.1800.9[7f8af06b0000+d4000]
[Sat Nov 11 00:49:59 2017] gnome-shell[31566]: segfault at e8 ip 
00007ffab7ae56a2 sp 00007fff76561338 error 4 in 
libgdk-3.so.0.1800.9[7ffab7aa8000+d4000]
[Sat Nov 11 20:01:10 2017] gnome-shell[23459]: segfault at e8 ip 
00007f6a4c1dd6a2 sp 00007ffdfcd62008 error 4 in 
libgdk-3.so.0.1800.9[7f6a4c1a0000+d4000]
[Sat Nov 11 21:05:36 2017] gnome-shell[28874]: segfault at e8 ip 
00007f48523d56a2 sp 00007ffd15fbc738 error 4 in 
libgdk-3.so.0.1800.9[7f4852398000+d4000]
}}}

My setup:
 * Dual monitors
 * OFTEN switch between users
    a) using the GDM3 "switch user" GUI
    b) using CTRL+ALT+FXX quick flips
 * Daily I suspend the system and resume (Power Management)

Versions
{{{
$ cat /etc/issue
Ubuntu 16.04.3 LTS \n \l

$ uname -a
Linux <hostname> 4.4.0-98-generic #121-Ubuntu SMP Tue Oct 10 14:24:03 UTC 2017 
x86_64 x86_64 x86_64 GNU/Linux

$ dpkg --list | grep gnome-shell
ii  chrome-gnome-shell                                          
9-0ubuntu1~ubuntu16.04.3                     all          GNOME Shell 
extensions integration for web browsers
ii  gnome-shell                                                 
3.18.5-0ubuntu0.3                            amd64        graphical shell for 
the GNOME desktop
ii  gnome-shell-common                                          
3.18.5-0ubuntu0.3                            all          common files for the 
GNOME graphical shell
ii  gnome-shell-timer                                           
0.3.12+20140924-3                            all          GNOME Shell extension 
providing a countdown timer in the top panel

$ dpkg --list | grep libgdk
ii  libgdk-pixbuf2.0-0:amd64                                    
2.32.2-1ubuntu1.3                            amd64        GDK Pixbuf library
ii  libgdk-pixbuf2.0-0:i386                                     
2.32.2-1ubuntu1.3                            i386         GDK Pixbuf library
ii  libgdk-pixbuf2.0-common                                     
2.32.2-1ubuntu1.3                            all          GDK Pixbuf library - 
data files
ii  libgdk-pixbuf2.0-dev                                        
2.32.2-1ubuntu1.3                            amd64        GDK Pixbuf library 
(development files)

}}}

** Changed in: gnome-shell (Ubuntu)
       Status: Invalid => Confirmed

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Title:
  gnome-shell crashes often

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