.
Thread 1 (Thread 11940):
#0  0x0000000000000000 in ?? ()
#1  0x00007f704055eaa9 in _swrast_read_rgba_span ()
   from /usr/lib/dri/i915_dri.so
#2  0x00007f70405522e2 in ?? () from /usr/lib/dri/i915_dri.so
#3  0x00007f7040553c6b in _swrast_CopyPixels () from /usr/lib/dri/i915_dri.so
#4  0x00007f704043c9ea in intelCopyPixels () from /usr/lib/dri/i915_dri.so
#5  0x00007f70405ac502 in _mesa_CopyPixels () from /usr/lib/dri/i915_dri.so
#6  0x0000000000405cbd in ?? ()
#7  0x0000000000402ed2 in ?? ()
#8  0x0000000000403845 in ?? ()
#9  0x00007f7042bf6acd in __libc_start_main () from /lib/libc.so.6
#10 0x00000000004027a9 in ?? ()
#11 0x00007fffc2cbe4c8 in ?? ()
#12 0x000000000000001c in ?? ()
#13 0x0000000000000002 in ?? ()
#14 0x00007fffc2cbfddb in ?? ()
#15 0x00007fffc2cbfde2 in ?? ()
#16 0x0000000000000000 in ?? ()