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I'm wondering if this Abort is a red herring. It's caused by the following section in PyThreadState_Swap in Python/pystate.c:
#if defined(Py_DEBUG) && defined(WITH_THREAD)
 if (newts) {
 /* This can be called from PyEval_RestoreThread(). Similar
 to it, we need to ensure errno doesn't change.
 */
 int err = errno;
 PyThreadState *check = PyGILState_GetThisThreadState();
 if (check && check->interp == newts->interp && check != newts)
 Py_FatalError("Invalid thread state for this thread");
 errno = err;
 }
#endif 
Specifically this test is true:
check->interp == newts->interp
I'm not convinced if this is right, and a friend who's a bit more clued up than me isn't sure either.
Could someone look at it to check?