On 16/09/2019 23.37, V-ron P wrote: > Hello Python Dev, > > One of my HTTPS servers leaked over 8 GB of memory over the past week. > After troubleshooting the issue, I managed to narrow it down to the > minimal test case below: > > https://gist.github.com/hydrogen-mvm/d588521c2138e0f98aa94b18e7dedfdb > > (Note that the 100 threads are not necessary, but they help exaggerate > and accelerate the memory leaking.) > > The memory leak happens if I send a HTTPS request, regardless if it's > GET or POST. The most bizarre part is the destination address does > -not- need to exist and it still leaks! (In the script above it points > to a non-existent HTTPS server on your localhost.) > > This leak does not happen for HTTP (plaintext) requests, which suggests > that the bug might be SSL-related. > > My OS is Windows 7 and my Python version is: > > Python 3.7.4 (tags/v3.7.4:e09359112e, Jul 8 2019, 20:34:20) [MSC v.1916 > 64 bit (AMD64)] on win32 > > A friend of mine tested the script on his Windows 10 machine and also > experienced the same memory leaking effect. > > Please confirm if this is in fact a bug in Python or this is a bug in my > environment. Thanks.
Yes, we are aware of a memory leak on Windows. A recent change has caused a memory leak and performance regression in the Windows-only part of the ssl module. The bug is fixed in 3.7 branch but not yet released. See https://bugs.python.org/issue37702 and https://bugs.python.org/issue35941 for more details. As a workaround I suggest that you create a single SSLContext with ssl.create_default_context() and reuse the context in all HTTP queries. You can share the context across threads w/o locking and use it for all HTTPS connections. A single SSLContext is also more efficient. Christian _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/CYKQCXVPJBFGUDMEE7QFQ5EWQF3LUJDG/
