I'm happy to help.  I've applied the patch from the gnome bug to a local
package build.  Haven't seen the crash since but only been a day or so
(was crashing on the order of once a week prior)

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https://bugs.launchpad.net/bugs/1714542

Title:
  gnome-shell crashed with SIGSEGV in
  st_theme_node_reduce_border_radius() from
  st_theme_node_paint_borders() from st_theme_node_paint()

Status in GNOME Shell:
  Confirmed
Status in gnome-shell package in Ubuntu:
  In Progress

Bug description:
  https://errors.ubuntu.com/problem/23d376488259ea5f9fa6fb9843956cb6464f56e8

  ---

  As of an upgrade to 3.25.91 (last session that did not exhibit this
  behavior was a 3.24.x session), I've experienced several crashes of
  the shell in the overview. journalctl shows the following output at
  the time of the crash:

  Sep 01 08:14:41 spiny org.gnome.Shell.desktop[8792]: Window manager warning: 
Overwriting existing binding of keysym ffb5 with keysym ffb5 (keycode 54).
  Sep 01 08:14:41 spiny gnome-shell[8506]: 
meta_renderer_native_release_onscreen: assertion 
'onscreen_native->gbm.next_fb_id == 0' failed
  Sep 01 08:14:41 spiny gnome-shell[8506]: _cogl_onscreen_free: assertion 
'onscreen->winsys == ((void *)0)' failed
  Sep 01 08:14:41 spiny kernel: gnome-shell[8506]: segfault at 1a0 ip 
00007fc6008dd296 sp 00007fff2df360f0 error 4 in 
libmutter-1.so.0.0.0[7fc6007f9000+13e000]
  Sep 01 08:14:41 spiny org.gnome.Shell.desktop[8506]: (EE)
  Sep 01 08:14:41 spiny org.gnome.Shell.desktop[8506]: Fatal server error:
  Sep 01 08:14:41 spiny org.gnome.Shell.desktop[8506]: (EE) failed to read 
Wayland events: Connection reset by peer
  Sep 01 08:14:41 spiny org.gnome.Shell.desktop[8506]: (EE)
  Sep 01 08:14:41 spiny gnome-session[8488]: gnome-session-binary[8488]: 
WARNING: Application 'org.gnome.Shell.desktop' killed by signal 11
  Sep 01 08:14:41 spiny gnome-session-binary[8488]: Unrecoverable failure in 
required component org.gnome.Shell.desktop
  Sep 01 08:14:41 spiny gnome-session-binary[8488]: WARNING: Application 
'org.gnome.Shell.desktop' killed by signal 11
  Sep 01 08:14:41 spiny polkitd(authority=local)[1424]: Unregistered 
Authentication Agent for unix-session:c3 (system bus name :1.868, object path 
/org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disco
  Sep 01 08:14:41 spiny gsd-media-keys[8610]: gsd-media-keys: Fatal IO error 11 
(Resource temporarily unavailable) on X server :1024.
  Sep 01 08:14:41 spiny gsd-keyboard[8607]: gsd-keyboard: Fatal IO error 11 
(Resource temporarily unavailable) on X server :1024.
  Sep 01 08:14:41 spiny gsd-clipboard[8596]: gsd-clipboard: Fatal IO error 11 
(Resource temporarily unavailable) on X server :1024.
  Sep 01 08:14:41 spiny gsd-power[8613]: gsd-power: Fatal IO error 11 (Resource 
temporarily unavailable) on X server :1024.
  Sep 01 08:14:41 spiny gsd-color[8599]: gsd-color: Fatal IO error 11 (Resource 
temporarily unavailable) on X server :1024.
  Sep 01 08:14:41 spiny org.a11y.atspi.Registry[8529]: XIO: fatal IO error 11 
(Resource temporarily unavailable) on X server ":1024"
  Sep 01 08:14:41 spiny org.a11y.atspi.Registry[8529]: after 21 requests (21 
known processed) with 0 events remaining.
  Sep 01 08:14:41 spiny gdm-launch-environment][8400]: 
pam_unix(gdm-launch-environment:session): session closed for user gdm
  Sep 01 08:14:41 spiny systemd-logind[1376]: Removed session c3.
  Sep 01 08:14:41 spiny systemd[1]: Stopping User Manager for UID 121...
  Sep 01 08:14:41 spiny systemd[8432]: Stopping Accessibility services bus...
  Sep 01 08:14:41 spiny systemd[8432]: Stopping Sound Service...
  Sep 01 08:14:41 spiny systemd[8432]: Stopped target Default.
  Sep 01 08:14:41 spiny systemd[8432]: Stopping D-Bus User Message Bus...
  Sep 01 08:14:41 spiny systemd[8432]: Stopping sandboxed app permission 
store...
  Sep 01 08:14:41 spiny systemd[8432]: Stopped sandboxed app permission store.
  Sep 01 08:14:41 spiny systemd[8432]: Stopped D-Bus User Message Bus.
  Sep 01 08:14:41 spiny systemd[8432]: Stopped Accessibility services bus.
  Sep 01 08:14:41 spiny systemd[8432]: Stopped Sound Service.
  Sep 01 08:14:41 spiny systemd[8432]: Stopped target Basic System.
  Sep 01 08:14:41 spiny systemd[8432]: Stopped target Paths.
  Sep 01 08:14:41 spiny systemd[8432]: Stopped target Timers.
  Sep 01 08:14:41 spiny systemd[8432]: Stopped target Sockets.
  Sep 01 08:14:41 spiny systemd[8432]: Closed D-Bus User Message Bus Socket.
  Sep 01 08:14:41 spiny systemd[8432]: Closed Sound System.
  Sep 01 08:14:41 spiny systemd[8432]: Reached target Shutdown.
  Sep 01 08:14:41 spiny systemd[8432]: Starting Exit the Session...
  Sep 01 08:14:41 spiny systemd[8432]: Received SIGRTMIN+24 from PID 8854 
(kill).
  Sep 01 08:14:41 spiny systemd[1]: Stopped User Manager for UID 121.
  Sep 01 08:14:41 spiny systemd[1]: Removed slice User Slice of gdm.

  ProblemType: Crash
  DistroRelease: Ubuntu 17.10
  Package: gnome-shell 3.25.91-0ubuntu1
  ProcVersionSignature: Ubuntu 4.12.0-12.13-generic 4.12.8
  Uname: Linux 4.12.0-12-generic x86_64
  ApportVersion: 2.20.7-0ubuntu1
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Fri Sep  1 08:13:58 2017
  DisplayManager: gdm3
  EcryptfsInUse: Yes
  ExecutablePath: /usr/bin/gnome-shell
  InstallationDate: Installed on 2015-08-21 (742 days ago)
  InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150819)
  ProcCmdline: /usr/bin/gnome-shell
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x7f36d97a3a80:        mov    0x80(%rdi),%eax
   PC (0x7f36d97a3a80) ok
   source "0x80(%rdi)" (0x00000080) not located in a known VMA region (needed 
readable region)!
   destination "%eax" ok
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: gnome-shell
  StacktraceTop:
   () at /usr/lib/gnome-shell/libst-1.0.so
   () at /usr/lib/gnome-shell/libst-1.0.so
   st_theme_node_paint () at /usr/lib/gnome-shell/libst-1.0.so
   st_widget_paint_background () at /usr/lib/gnome-shell/libst-1.0.so
   () at /usr/lib/gnome-shell/libst-1.0.so
  Title: gnome-shell crashed with SIGSEGV
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip docker input lpadmin lxd plugdev sambashare sudo 
systemd-journal wireshark

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