Using LLMs to find Python C-extension bugs

Link: https://lwn.net/Articles/1067234/Jake Edge, LWN.net: […] Hobbyist Daniel Diniz used Claude Code to find more than 500 bugs of various sorts across nearly a million lines of code in 44 extensions; he has been working with maintainers to get fixes upstream and his methodology serves as a great example of how to keep the human in the loop—and the maintainers out of burnout—when employing LLMs. It's worth reading Daniel Diniz's post on the Python forums in full. This is a great example of an engineer with specific domain expertise using LLMs to augment and amplify his abilities. Not just that, he's working closely with maintainers to ensure he's not inundating them with slop PRs or unreproducible bug reports.The part I find most interesting is how Daniel's Claude Code plugin works. He writes in his forum post: I built a Claude Code plugin called cext-review-toolkit. The key difference from traditional static analysis is that this system tracks Python-specific invariants (refcounts,…