I encountered this when a coworker got random segfaults trying to run some Cython code. Somehow, he was using an old beta version of the interpreter. After step

I encountered this when a coworker got random segfaults trying to run some Cython code. Somehow, he was using an old beta version of the interpreter. After stepping through with GDB (I think it was a call to LOAD_CONST) and finding the offending seemingly benign code, on a hunch, I updated the interpreter, and the random segfault disappeared.