Antoine Pitrou added the comment:
Here is the gdb backtrace. The `gc` variable is equal to NULL.
0x000000000043d254 in finalize_garbage (collectable=0x7fffffffdc40,
old=0x8fdae0 <generations+64>)
at Modules/gcmodule.c:788
788 if (!_PyGCHead_FINALIZED(gc) &&
(gdb) bt
#0 0x000000000043d254 in finalize_garbage (collectable=0x7fffffffdc40,
old=0x8fdae0 <generations+64>)
at Modules/gcmodule.c:788
#1 0x000000000043dac0 in collect (generation=2, n_collected=0x7fffffffdca8,
n_uncollectable=0x7fffffffdcb0, nofail=0)
at Modules/gcmodule.c:1009
#2 0x000000000043dffc in collect_with_callback (generation=2) at
Modules/gcmodule.c:1128
#3 0x000000000043eda0 in PyGC_Collect () at Modules/gcmodule.c:1604
#4 0x000000000041f332 in Py_Finalize () at Python/pythonrun.c:607
#5 0x000000000043c401 in Py_Main (argc=2, argv=0x980020) at Modules/main.c:788
#6 0x000000000041af96 in main (argc=2, argv=0x7fffffffdfc8) at
./Modules/python.c:69
(gdb) p gc
$1 = (PyGC_Head *) 0x0
----------
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21435>
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