Arch Linux

I upgraded Mesa to 17.1.6-1, Firefox to 55.0-1 and geocode-glib to 3.24.0-1, although I hadn't restarted yet and suddenly, while browsing the web the mouse froze (as it had done a little earlier today after this upgrade) and then suddenly gnome-shell restarted. This is what the log says:

Aug 08 22:34:42 <computerName> org.gnome.Shell.desktop[771]: 1502228082965 Sync.ErrorHandler ERROR Sync encountered a login error
Aug 08 23:09:57 <computerName> org.gnome.Shell.desktop[771]: Promise resolved while context is inactive
Aug 08 23:09:57 <computerName> org.gnome.Shell.desktop[771]: Promise resolved after context unloaded
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: *** BUG ***
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: In pixman_region_append_non_o: The expression y1 < y2 was false
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: Set a breakpoint on '_pixman_log_error' to debug
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: *** BUG ***
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: In pixman_region_append_non_o: The expression r->x1 < r->x2 was false
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: Set a breakpoint on '_pixman_log_error' to debug
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: *** BUG ***
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: In pixman_region_append_non_o: The expression y1 < y2 was false
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: Set a breakpoint on '_pixman_log_error' to debug
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: *** BUG ***
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: In pixman_region_append_non_o: The expression r->x1 < r->x2 was false
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: Set a breakpoint on '_pixman_log_error' to debug
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: *** BUG ***
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: In pixman_region_append_non_o: The expression y1 < y2 was false
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: Set a breakpoint on '_pixman_log_error' to debug
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: *** BUG ***
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: In pixman_region_append_non_o: The expression r->x1 < r->x2 was false
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: Set a breakpoint on '_pixman_log_error' to debug
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: *** BUG ***
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: In pixman_region_append_non_o: The expression y1 < y2 was false
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: Set a breakpoint on '_pixman_log_error' to debug
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: *** BUG ***
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: In pixman_region_append_non_o: The expression r->x1 < r->x2 was false
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: Set a breakpoint on '_pixman_log_error' to debug
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: *** BUG ***
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: In pixman_region_append_non_o: The expression y1 < y2 was false
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: Set a breakpoint on '_pixman_log_error' to debug
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: *** BUG ***
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: In pixman_region_append_non_o: The expression r->x1 < r->x2 was false
Aug 08 23:13:06 <computerName> org.gnome.Shell.desktop[771]: Set a breakpoint on '_pixman_log_error' to debug
Aug 08 23:16:54 <computerName> gsd-housekeepin[922]: Failed to enumerate children of /var/tmp/systemd-private-81ccd6d2daca44d4b26082a527bdd88c-fwupd.service-KL
Aug 08 23:16:54 <computerName> gsd-housekeepin[922]: Failed to enumerate children of /var/tmp/systemd-private-81ccd6d2daca44d4b26082a527bdd88c-colord.service-n
Aug 08 23:16:54 <computerName> gsd-housekeepin[922]: Failed to enumerate children of /tmp/systemd-private-81ccd6d2daca44d4b26082a527bdd88c-fwupd.service-AzVkpO
Aug 08 23:16:54 <computerName> gsd-housekeepin[922]: Failed to enumerate children of /tmp/systemd-private-81ccd6d2daca44d4b26082a527bdd88c-colord.service-yH6tp
Aug 08 23:16:54 <computerName> gsd-housekeepin[922]: Failed to enumerate children of /tmp/.esd-120: Error opening directory '/tmp/.esd-120': Permission denied
Aug 08 23:27:24 <computerName> kernel: gnome-shell[771]: segfault at 6359ed9fffe8 ip 0000635a824acfe5 sp 00007a6b5c981070 error 4 in libgjs.so.0.0.0[635a824850
Aug 08 23:27:24 <computerName> systemd[1]: Created slice system-systemd\x2dcoredump.slice.
Aug 08 23:27:24 <computerName> systemd[1]: Started Process Core Dump (PID 8218/UID 0).

I have looked but I can't seem to find the coredump, but if I do find it, or someone points me to it, I will upload it.

I have gnome-shell version 3.24.3-1 and I try to keep my system as up-to-date as I can. I am a Java developer so I familiar with the concept of using breakpoints in IDEs, but I have no idea how I would do this for a DE, especially one using varied languages.