[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Change by Ben Brown : -- stage: -> resolved status: open -> closed ___ Python tracker ___ ___ Python-bugs-list mailing list

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Ben Brown added the comment: I can fully confirm the issue is due to flow control or lack of in my code the system runs out of resources and this is when it errors, I have implemented flow control in my protocol and it now works without errors. One thing I did find is that the documentation

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Ben Brown added the comment: With some more research it looks like the issue is flow related, I experimented with the StreamWriter in a simple server and using that plus drain() appears to have worked an I no longer get the error. I have added my new server to the gist I posted above.

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Maayan Keshet added the comment: Hey Ben! Unfortunately our use case is too involved to distill into a neat example. We use a websocket library (autobahn) to connect to a server of a 3rd party which is outside our control (which is not written in python, but rather node.js). We receive the

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Ben Brown added the comment: Maayan Keshet do you have a minimal example it would be interesting to compare against our code and see if there is something we are both doing that could help narrow down the issue. -- ___ Python tracker

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Maayan Keshet added the comment: Any updates on this issue? We're also encountering it as part of our websocket clients. -- nosy: +maayank ___ Python tracker ___

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Ben Brown added the comment: Hi is there any update on this issue, were you able to replicate the error with the minimal example I provided or is there any additional information I can provide. -- ___ Python tracker

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Andrew Svetlov added the comment: Thank you! Yuri, you might be interested too -- ___ Python tracker ___ ___ Python-bugs-list

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Ben Brown added the comment: I have created a minimal example if that helps to show the issue https://gist.github.com/bobthemac/031213b8e37960ee805f2ae1e6990b60 -- ___ Python tracker

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Ben Brown added the comment: I tested an older version of OpenSSL 1.0.2g and I get the same error on that -- ___ Python tracker ___

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Ben Brown added the comment: I am using the version I mentioned above 1.1.0 and TLS 1.2, I am sorry I can't be of more help. -- ___ Python tracker ___

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Christian Heimes added the comment: Is 1.1.0 also a problem? I have only seen issue with 1.1.1 and TLS 1.3. -- ___ Python tracker ___

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Ben Brown added the comment: That's a shame, which version should it work on I don't mind downgrading for now to fix the issue as a workaround. -- ___ Python tracker ___

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Andrew Svetlov added the comment: That's what I afraid. asyncio/sslproto.py fails on new OpenSSL at several places :( -- ___ Python tracker ___

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Andrew Svetlov added the comment: Just to clarify: what OpenSSL version is used? -- ___ Python tracker ___ ___ Python-bugs-list

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Ben Brown added the comment: The OpenSSL version is OpenSSL 1.1.0j 20 Nov 2018 -- ___ Python tracker ___ ___ Python-bugs-list

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

Christian Heimes added the comment: This looks more like an asyncio problem than an SSL problem. Andrew, Yury, please take a look. -- components: +asyncio nosy: +asvetlov, yselivanov ___ Python tracker

[issue37226] Asyncio Fatal Error on SSL Transport - IndexError Deque Index Out Of Range

New submission from Ben Brown : I have been getting an intermittent errors when using asyncio with SSL. The error always occurs in the _process_write_backlog method in asyncio's sslproto.py file. I have looked at lots of possibilities as to what the cause is and found that for some reason