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Created attachment 1078382 [details]
Backtrace of the crash

Description of problem:
KScreen crashes when trying to change resolution for vncviewer. It's reproducible almost every time, only in few cases it succeeds to change the resolution. Using "xrandr -s XXXXxYYYY" works pretty well. The issue is actually in libkscreen library and is already fixed in upstream.

Version-Release number of selected component (if applicable):
libkscreen-1.0.1-6.el7

Easily reproducible, granting dev_ack+.

Fixed in libkscreen-1.0.1-8.el7.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0717