aiohttp memtest
aiohttp has a memory leak, demonstrated in issue #4833.
Demonstration
make build up to see the issue in action. This will run every most recent Python version from 3.5 to 3.10, and output the results on your terminal.
There are also definitions for 3.4 and 3.11, but these both do not support this test (3.4 for syntax, 3.11 for asyncio changing its contract). You can make bbuild bup for these.