...
struct foo* get_remote_ptr(foo1, foo2, foo3)
{
    struct foo* Foo;
    // Foo gets assigned
    return Foo;
}

I get this error:
Program received signal SIGSEGV, Segmentation fault.
0x0000000000475797 in insertdict (value=0x7ffff055d420 <remote>, hash=8796075522393, key=0x7fffef4f9590, mp=0x7ffff7f010c8)
    at Objects/dictobject.c:802
802         MAINTAIN_TRACKING(mp, key, value);

I'm not sure why MAINTAIN_TRACKING is failing here and I can't seem to gdb into this code.