It appears that mutter is responsible for crashing your gnome-shell:
Oct 10 09:24:54 christophev-laptop kernel: gnome-shell[3920]: segfault
at 8 ip 00007fae2eb67877 sp 00007ffe5f1664d0 error 4 in
libmutter-1.so.0.0.0[7fae2eabe000+141000]
However in order to diagnose the problem further we will need a stack
trace. Please look in /var/crash for relevant crash files. And then
submit them using this command:
ubuntu-bug /var/crash/_my_crash_report.crash
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1722533
Title:
Gnome shell crashes on dual monitor lock screen
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