(gdb) run collide_blocks.py
Starting program: /usr/bin/python collide_blocks.py
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 47573009082080 (LWP 13638)]
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[New Thread 1082149200 (LWP 13641)]
[New Thread 1090541904 (LWP 13642)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1082149200 (LWP 13641)]
0x0000000000498c77 in PyErr_Fetch ()
(gdb) bt
#0  0x0000000000498c77 in PyErr_Fetch ()
#1  0x00002aaaad829e9c in __pyx_tp_dealloc_3soy_6bodies_7_bodies_Body (
    o=0x2b447371b910) at src/bodies._bodies/soy.bodies._bodies.c:3162
#2  0x00002aaaab14d27f in __pyx_f_3soy_6scenes_5Scene__coreRender (
    __pyx_v_self=0x2b44738116b0) at src/scenes/soy.scenes.c:1160
#3  0x00002aaaad82b9e5 in __pyx_f_3soy_6bodies_7_bodies_6Camera__coreProject (
    __pyx_v_self=<value optimized out>)
    at src/bodies._bodies/soy.bodies._bodies.c:2817
#4  0x00002aaaae68e420 in __pyx_f_3soy_7widgets_9Projector__coreRender (
    __pyx_v_self=<value optimized out>) at src/widgets/soy.widgets.c:2274
#5  0x00002b44744faa97 in __pyx_f_3soy_5_core_6Window__coreRender (
    __pyx_v_self=0x2b447380b5a8) at src/_core/soy._core.c:2542
#6  0x00002b44744fa073 in __pyx_f_3soy_5_core__coreLoop ()
    at src/_core/soy._core.c:3808
#7  0x00002b44738f1317 in start_thread () from /lib/libpthread.so.0
#8  0x00002b4474262d5d in clone () from /lib/libc.so.6
#9  0x0000000000000000 in ?? ()