segmentation fault when working two exmaples at the same time

Hi all,

I have some probelms. Recently, I upgraded qt version to 5.3.1 and segmentation fault occured when running two examples at the same time(affine, imagecomposition).

• gdb lnfo
  Using host libthread_db library "/lib/libthread_db.so.1".
  Core was generated by `./affine'.
  Program terminated with signal 11, Segmentation fault.
  #0 0x481cc01c in memcpy () from /lib/libc.so.6
  (gdb) where
  #0 0x481cc01c in memcpy () from /lib/libc.so.6
  #1 0x4991798c in destStore (rasterBuffer=<optimized out>, x=<optimized out>,
  y=<optimized out>, buffer=<optimized out>, length=<optimized out>)
  at /home/B110141/works/Yocto/build/linux-avn/tmp/work/armv7a-vfp-neon-telechips-linux-gnueabi/qtbase/5.3.1-r0/qtbase-opensource-src-5.3.1/src/gui/painting/qdrawhelper.cpp:946
  #2 0x499126cc in blend_color_generic (count=<optimized out>,
  spans=<optimized out>, userData=<optimized out>)
  at /home/B110141/works/Yocto/build/linux-avn/tmp/work/armv7a-vfp-neon-telechips-linux-gnueabi/qtbase/5.3.1-r0/qtbase-opensource-src-5.3.1/src/gui/painting/qdrawhelper.cpp:4429
  #3 0x4994ca88 in qt_span_fill_clipRect (count=<optimized out>,
  spans=<optimized out>, userData=<optimized out>)
  at /home/B110141/works/Yocto/build/linux-avn/tmp/work/armv7a-vfp-neon-telechips-linux-gnueabi/qtbase/5.3.1-r0/qtbase-opensource-src-5.3.1/src/gui/painting/qpaintengine_raster.cpp:4075
  #4 0x49909194 in QCosmeticStroker::drawLine (this=<optimized out>, p1=...,
  p2=...)
  at /home/B110141/works/Yocto/build/linux-avn/tmp/work/armv7a-vfp-neon-telechips-linux-gnueabi/qtbase/5.3.1-r0/qtbase-opensource-src-5.3.1/src/gui/painting/qcosmeticstroker.cpp:381
  #5 0x4995902c in QRasterPaintEngine::drawLines (this=<optimized out>,
  lines=<optimized out>, lineCount=<optimized out>)

I also want to know about qpa directfb support plans in the qt 5.4 or 5.3.2?

the current qpa directfb platform have some problems(this issuue, touch/mouse event focus( + create unused window)).

Thank you.