Segmentation fault in Qt5.4 QGuiApplication on Ubuntu

[NKumar]

I run with valgrind with options --tool=memcheck --leak-check=full. Below is the top most content in the valgrind log file.

==8938== Process terminating with default action of signal 11 (SIGSEGV)
==8938== Bad permissions for mapped region at address 0xD6E6360
==8938== at 0x7979227: QMetaObject::className() const (in /home/nkumar/Qt/5.4/gcc_64/lib/libQt5Core.so.5.4.0)
==8938== by 0xF43DFB6: ??? (in /home/nkumar/Qt/5.4/gcc_64/lib/libQt5Widgets.so.5.4.0)
==8938== by 0x4010139: call_init.part.0 (dl-init.c:78)
==8938== by 0x4010222: _dl_init (dl-init.c:36)
==8938== by 0x4001309: ??? (in /lib/x86_64-linux-gnu/ld-2.19.so)
==8938==

It seems the segmentation fault is caused by QMetaObject::className() const (in /home/nkumar/Qt/5.4/gcc_64/lib/libQt5Core.so.5.4.0)

[anda_skoa]

And what does the debugger say?
How does the backtrace look like?

Cheers,
_

[thuongshoo]

I guess the problem is from example code
I use directfb and I faced the same error with analogclock and rasterwindow.
I patched as the following link http://interest.qt-project.narkive.c...-linuxfb-crash

--- a/examples/gui/rasterwindow/rasterwindow.cpp 2013-02-01
12:22:04.414289323 +1300
+++ b/examples/gui/rasterwindow/rasterwindow.cpp 2013-02-01
12:22:09.914337845 +1300
@@ -45,8 +45,8 @@
: QWindow(parent)
, m_update_pending(false)
{
- m_backingStore = new QBackingStore(this);
create();
+ m_backingStore = new QBackingStore(this);

setGeometry(100, 100, 300, 200);
--
--- a/src/plugins/platforms/linuxfb/qlinuxfbintegration.cpp
2013-02-01 12:26:58.390337550 +1300
+++ a/src/plugins/platforms/linuxfb/qlinuxfbintegration.cpp
2013-02-01 12:27:10.890315043 +1300
@@ -84,6 +84,7 @@

QPlatformBackingStore
*QLinuxFbIntegration::createPlatformBackingStore(Q Window *window)
const
{
+ window->create();
return new QFbBackingStore(window);
}
--

Now I can run the examples but window posistion isnot right.