I ran into the same problem with a self written libwebkitgtk program,
also for the 'antialias' property which is asked in the same path
XGetDefault call from cairo-xlib-screen.c .
The segfault seems to always occur in the calls from libcairo2, more
precisely cairo-xlib-screen.c function
_cairo_x
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: overlay-scrollbar (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/931381
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