That log message is very common in GTK apps. I don't think it is related
As for $HOME/core, it sounds like you're now stuck on bug 1746874.
Sorry. I hope we can fix that soon.
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gnome-shell crashes occasionally (libmutter)
Status in gnome-shell package in Ubuntu:
I see occasional crashes of gnome-shell that get me back to the login
After these crashes I find something like the following line in dmesg:
gnome-shell: segfault at b0 ip 00007fddec8387d1 sp
00007ffdf2061a80 error 4 in libmutter-1.so.0.0.0[7fddec763000+142000]
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