#0  0xb6f68df0 in dispmanx_notify_callback () from /opt/vc/lib/libbcm_host.so
#1  0xb6f3a138 in completion_thread () from /opt/vc/lib/libvchiq_arm.so
#2  0xb6f48da0 in vcos_thread_entry () from /opt/vc/lib/libvcos.so
#3  0xb6f1fbfc in start_thread () from /lib/arm-linux-gnueabihf/libpthread.so.0
#4  0xb6e34868 in ?? () from /lib/arm-linux-gnueabihf/libc.so.6
#5  0xb6e34868 in ?? () from /lib/arm-linux-gnueabihf/libc.so.6