## Summary RustPython 0.5.0 (and also current `main`) hangs and starts eating 100% CPU (one core) on first or second iteration of following script: ```python import urllib.request for i in range(3): print(i) req=urllib.request.Request('https://crates.io/api/v1/crates/tokio') with urllib.request.urlopen(req) as r: r.read() ``` Interesting thing is, reproducibility depends on what exactly HTTPs server sends to the client. Just HTTPs plus relatively large file is not enough. For example, bug completely disappears when I replace `https://crates.io/api/v1/crates/tokio` with `https://gist.githubusercontent.com/khaykov/a6105154becce4c0530da38e723c2330/raw/41ab415ac41c93a198f7da5b47d604956157c5c3/gistfile1.txt`. I was able to `git bisect` this to a single problematic commit - 073adbd8da244b6203e8f32009b905af390c1a3d (https://github.com/RustPython/RustPython/pull/7418). Reverting it on top of 0.5.0 fixes this issue for me. And I have no idea about how to fix this properly. ## Expected RustPython should terminate after three iterations. ## Actual RustPython hangs and starts eating 100% CPU ## Python Documentation N/A