gdb) run -platform hwcomposer main.qml
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /usr/lib/qt5/bin/qmlscene -platform hwcomposer main.qml
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/libthread_db.so.1".
EGLFS: Screen Info
 - Physical size: QSizeF(154, 90)
 - Screen size: QSize(1024, 600)
 - Screen depth: 32
== hwcomposer module ==
 * Address: 0xb3d88004
 * Module API Version: 1
 * HAL API Version: 100
 * Identifier: hwcomposer
 * Name: SAMSUNG_SLSI slsiap hwcomposer module
 * Author: swpark@nexell.co.kr
== hwcomposer module ==
[New Thread 0xb3d553a0 (LWP 3434)]
virtual bool V4l2Device::activate(): /dev/v4l-subdev2 5
virtual bool V4l2Device::activate(): /dev/v4l-subdev0 1
virtual bool V4l2Device::activate(): /dev/video4 2
virtual bool V4l2Device::activate(): /dev/v4l-subdev1 3
virtual bool V4l2Device::activate(): /dev/video5 4
virtual bool V4l2Device::activate(): /dev/v4l-subdev4 8
virtual bool V4l2Device::activate(): /dev/video8 10
virtual bool V4l2Device::activate(): /dev/v4l-subdev5 11
virtual bool V4l2Device::activate(): /dev/video9 12
virtual bool V4l2Device::activate(): /dev/video10 13
virtual bool V4l2Device::activate(): /dev/v4l-subdev6 14
virtual bool V4l2Device::activate(): /dev/v4l-subdev7 15
== hwcomposer device ==
 * Version: 1010001 (interpreted as 1010001)
 * Module: 0xb3d88004
== hwcomposer device ==
[New Thread 0xb3b553a0 (LWP 3435)]
[New Thread 0xb3954b40 (LWP 3436)]
QEglScreen 0x2caf0

[New Thread 0xb387d3a0 (LWP 3437)]
[New Thread 0xb367d3a0 (LWP 3438)]
QEglWindow 0xf43a0: 0xf3e18 0x0

[New Thread 0xb2acf3a0 (LWP 3439)]
[New Thread 0xb26ff3a0 (LWP 3440)]
WARNING: void HWComposerNativeWindow::allocateBuffers(): allocated only 0 buffers out of 4
qmlscene: hwcomposer_window.cpp:204: virtual int HWComposerNativeWindow::dequeueBuffer(BaseNativeWindowBuffer**, int*): Assertion `!m_bufList.empty()' failed.

Program received signal SIGABRT, Aborted.
[Switching to Thread 0xb2acf3a0 (LWP 3439)]
__libc_do_syscall () at ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S:44
44     ../ports/sysdeps/unix/sysv/linux/arm/libc-do-syscall.S: No such file or directory.