Hello,
I am working in a Qt 5.6 multithreading application with armstone a9r2, build over buildroot V3.0.The application has up-to 5 threads.
Since some days ago the application we are developing has a problem that seems related to graphics part (it appears randomly only if QLabel::SetPixmap or QPixmap.scaled are called at 2 times/second).
Sometimes main thread gets blocked and don’t react to signal-slot events, but other threads continue working as expected.
Ocasionally screen gets black or screen gets painted totally incorrect with a large triangle and random straight lines, only during a fraction of a second.
After 3 minutes the main thread gets unblocked and continues to work properly.
Maximum use of cpu time is 3%, so I think it cannot be a saturation of timer calls, too much painting objects, etc.
In console I get several time this message:
[ 1] Fence Wait TimeOut!
[ 2] Reset Fence!
[ 3] Fence Wait TimeOut!
[ 4] Reset Fence!
I am using EGLFS for graphics.
When I run the application the command line are “Application -plugin tslib”
and system variables:
QT_QPA_EGLFS_DISABLE_INPUT=1
QT_QPA_EGLFS_PHYSICAL_HEIGHT=130
QT_QPA_EGLFS_PHYSICAL_WIDTH=216
TSLIB_TSDEVICE=/dev/input/event0
QT_QPA_EGLFS_FB=/dev/fb0
I tried using “Application -platform minimum” without graphics, to see what happens. And the application does not get blocked at all after several hours.
Could you help us to find a solution, please?
Thanks
