Program received signal SIGSEGV, Segmentation fault.
0x00007fca2a256c67 in drmmode_flip_abort () from /usr/lib/xorg/modules/drivers/radeon_drv.so
(gdb) bt f
#0  0x00007fca2a256c67 in drmmode_flip_abort () from /usr/lib/xorg/modules/drivers/radeon_drv.so
No symbol table info available.
#1  0x00007fca2a253c34 in radeon_drm_abort_one () from /usr/lib/xorg/modules/drivers/radeon_drv.so
No symbol table info available.
#2  0x00007fca2a25b070 in radeon_do_pageflip () from /usr/lib/xorg/modules/drivers/radeon_drv.so
No symbol table info available.
#3  0x00007fca2a252c58 in radeon_dri2_frame_event_handler () from /usr/lib/xorg/modules/drivers/radeon_drv.so
No symbol table info available.
#4  0x00007fca2a253cab in radeon_drm_queue_handler () from /usr/lib/xorg/modules/drivers/radeon_drv.so
No symbol table info available.
#5  0x00007fca306de216 in drmHandleEvent () from /usr/lib/libdrm.so.2
No symbol table info available.
#6  0x000000000043d6cb in WakeupHandler ()
No symbol table info available.
#7  0x000000000058d923 in WaitForSomething ()
No symbol table info available.
#8  0x0000000000438831 in ?? ()
No symbol table info available.
#9  0x000000000043cb8b in ?? ()
No symbol table info available.
#10 0x00007fca2f556800 in __libc_start_main () from /usr/lib/libc.so.6
No symbol table info available.
#11 0x0000000000427039 in _start ()
No symbol table info available.