New submission from Hingyuen Lam <linx...@gmail.com>:

There is an infinite loop in feed_appdata() of sslproto.py.
The OpenSSL documents said when some fatal I/O error occurred, 
SSL_ERROR_SYSCALL is returned and no further I/O operations should be 
performed. This error is ignored in the exception handling of feed_appdata(), 
and the while loop will never be break.
This error should be raised, the same for feed_ssldata().

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components: asyncio
messages: 385144
nosy: asvetlov, linxy95, yselivanov
priority: normal
severity: normal
status: open
title: Infinite loop in asyncio sslproto
type: behavior
versions: Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42941>
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