sanic: Memory leak serving static files

Describe the bug The memory of the process is increasing for everytime I request a static file.

Code snippet

import os

app = Sanic(__name__)
here = os.path.dirname(__file__)
app.static("/static", os.path.join(here, "static")

if __name__ == "__main__":
    app.run()

Access a static file. The bigger the file the more memory will be tied up. http://localhost:8000/static/index.html

Expected behavior Memory should be cleared up after serving a static file or at least not linearly increase with each request.

Environment (please complete the following information):

• OS: macOS BigSur 11.5.2
• Version 21.9.1

Update: I have been trying to replicate our setup as close as possible and can now quite reliably reproduce the issue. Could you have a look here and let me know if this works for you? https://github.com/seibushin/sanic-mem-leak