bug#40665: 28.0.50; tls hang on local ssl

[Robert Pluim]

>>>>> On Tue, 21 Apr 2020 13:37:04 +0000 (UTC), Derek Zhou <derek@3qin.us> said:

    Derek> Robert Pluim writes:

    >>>>>>> On Tue, 21 Apr 2020 01:41:21 +0000 (UTC), Derek Zhou 
<derek@3qin.us> said:
    >> 
    Derek> Derek Zhou writes:
    >> 
    >> >> Robert Pluim writes:
    >> >> 
    >> >>> I assume youʼre running with the change locally. If you continue to 
do
    >> >>> so, and donʼt see any issues, then that raises my confidence in the
    >> >>> change being correct.
    >> >>> 
    >> >>> Iʼll update this bug when I push a change.
    >> >> Hold on. This break a lot of other https sites. I'll debug more, if
    >> >> someone is more familiar with this case please also look into this.
    >> 
    Derek> False alarm. I was backporting the patch to 26.3, which does not have
    Derek> the other change:
    >> 
    >> See my earlier note about dragons in the code :-)

    Derek> I still see some https site stalled with no content displayed. 
However,
    Derek> as soon as I type something on the keyboard, content would come in;
    Derek> Strongly suggested that there are some problem in the emacs process
    Derek> layer. Will dig deeper.

With emacs-26 or emacs-27? The GnuTLS code between the two is quite
different, mainly things like:

    commit e87e6a24c49542111e669b7d0f1a412024663f8e
    Author: Paul Eggert <eggert@cs.ucla.edu>
    Date:   Tue Jan 15 23:51:45 2019 -0800

        Fix unlikely races with GnuTLS, datagrams

which despite the comment are perhaps not that unlikely.

Robert