gistfile1.txt

sudo gdb -p `pgrep -u $USER -x gnome-shell` <<<"print /r _cogl_pango_renderer_clear_glyph_cache((CoglPangoRenderer*)(_cogl_pango_font_map_get_priv(clutter_context_get_pango_fontmap())->renderer))"
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Attaching to process 29991
[New LWP 11303]
[New LWP 11305]
[New LWP 11312]
[New LWP 11341]
[New LWP 11342]
[New LWP 11343]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f13469b270d in poll () at ../sysdeps/unix/syscall-template.S:84
84	../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) $1 = void
(gdb) quit
A debugging session is active.

	Inferior 1 [process 29991] will be detached.

Quit anyway? (y or n) [answered Y; input not from terminal]
Detaching from program: /usr/bin/gnome-shell, process 29991