Red Hat Bugzilla – Bug 813242
kdelibs: crashes in KColorDialog::grabColor
Last modified: 2013-08-01 07:40:46 EDT
Description of problem:
Kruler constantly crashes when it is set to "screen width" length and being used in Fedora 17 RC4.1.
Version-Release number of selected component (if applicable):
4.8.1 (same as KDE)
Steps to Reproduce:
1. Set length to full screen width (my screen resolution is 1440x900 at the moment)
2. Use it... Crashes in a few seconds
I wasn't able to install debug symbols at this moment. I will provide backtraces if I'll get them.
I cannot reproduce any failure(s) as described. Will anxiously await your backtrace.
(or retest with kde-4.8.2 from -testing)
Created attachment 578017 [details]
I finally managed to get the backtrace only with KDE 4.8.2, however, it is still present.
#6 0x00007fe5a593e80b in KColorDialog::grabColor (p=...) at /usr/src/debug/kdelibs-4.8.2/kdeui/colors/kcolordialog.cpp:1759
Seems something down in kdelibs
*** Bug 813248 has been marked as a duplicate of this bug. ***
So, the code that's failing is in XGetPixel ?
KColorDialog::grabColor(const QPoint &p)
// we use the X11 API directly in this case as we are not getting back a valid
// return from QPixmap::grabWindow in the case where the application is using
// an argb visual
if( !qApp->desktop()->geometry().contains( p ))
Window root = RootWindow(QX11Info::display(), QX11Info::appScreen());
XImage *ximg = XGetImage(QX11Info::display(), root, p.x(), p.y(), 1, 1, -1, ZPixmap);
unsigned long xpixel = XGetPixel(ximg, 0, 0);
or XGetImage is encountering some problem and returning NULL perhaps.
I guess some new "security" feature in X11 is preventing access to stuff outside of the application window(s).
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