Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: 10 at address: 0x000000010170e000
0x00000001016eeaa0 in crc32 ()

(gdb) backtrace
#0  0x00000001016eeaa0 in crc32 ()
#1  0x00000001016e806d in PyZlib_crc32 (self=0x1016aa588, args=0x1016bf220) at /private/tmp/a/py3k/Modules/zlibmodule.c:993

PyZlib_crc32(PyObject *self, PyObject *args)
...
        while (len > (size_t) UINT_MAX) {
            crc32val = crc32(crc32val, buf, UINT_MAX);
...