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bug#34763: 27.0.50; url-retrieve-synchronously misbehaves inside eldoc-d

From: Dmitry Gutov
Subject: bug#34763: 27.0.50; url-retrieve-synchronously misbehaves inside eldoc-documentation-function
Date: Wed, 10 Apr 2019 04:44:15 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 
On 09.04.2019 9:34, Eli Zaretskii wrote:


(I didn't ignore the rest of what you wrote, I just don't have good
answers for that, and not enough time to study the code and come up
with such answers.  Sorry.)


That's totally fine, I have my own print-debugging to do anyway.


The list gets shorter over time.


That's why I proposed to kill the processes manually, but you say it
didn't help, which is strange.  Does killing processes also make the
list shorter?
It does, yes. If I kill the processes inside Emacs, the connections first become "orphaned", but in a few minutes, they disappear, if I don't create any new ones. That doesn't fix the problem, unfortunately (transfers are still not remotely as fast as they were initially). Resetting url-http-open-connections to an empty hash doesn't help either.
I've tried this both at home and at work (different network equipment and internet providers, although the routes probably have common segments), the behavior is very similar. 

Here's a (probably unnecessary) example.

Before:
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 zappa:34964 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 0 zappa:43298 mrs08s04-in-f4.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 0 zappa:34954 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34958 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 0 zappa:34940 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 0 zappa:34968 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 0 zappa:34974 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 0 zappa:34960 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34938 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34948 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 0 zappa:34942 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 1 zappa:36306 ns345059.ip-176-31-225.eu:http LAST_ACK - tcp 0 0 zappa:43300 mrs08s04-in-f4.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 0 zappa:34946 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 1 zappa:36302 ns345059.ip-176-31-225.eu:http LAST_ACK - tcp 0 0 zappa:34956 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 0 zappa:34952 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 0 zappa:34944 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 1 zappa:36304 ns345059.ip-176-31-225.eu:http LAST_ACK - tcp 0 0 zappa:34950 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 0 zappa:34962 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 0 zappa:34970 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs 

Right after killing:
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 zappa:34964 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:43298 mrs08s04-in-f4.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34954 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34958 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34940 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34976 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 0 zappa:34968 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34974 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34960 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34938 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34948 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34980 ham02s11-in-f36.1e100.net:http ESTABLISHED 31833/src/emacs tcp 0 0 zappa:34942 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:43300 mrs08s04-in-f4.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34946 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34952 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34944 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34950 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34962 ham02s11-in-f36.1e100.net:http TIME_WAIT - tcp 0 0 zappa:34970 ham02s11-in-f36.1e100.net:http TIME_WAIT - 

It becomes empty if I wait a little.
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