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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: Tue, 9 Apr 2019 03:48:17 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 
On 08.04.2019 20:13, Eli Zaretskii wrote:


url-retrieve-synchronously doesn't bother to reset them, just kills the
process. Speaking of, shouldn't that be enough for our scenario?


I think so, yes.
So I guess the first step would be to figure out why url-retrieve-synchronously does that isn't enough. 


Well, if url-http-debug is never entered, its cleanup logic will never
be executed. Shouldn't we consider that a problem as well?


Depends on how the cleanup code will be written.  It can be written
such that it works regardless where the interruption happens.


Do you have a "good" approach in mind that would still use url-http-debug?


I mean, like, interrupted by a different kind of error. Not a signal
that's cleanly handled in Emacs's internals.


A bug, then?
Possibly. Or I imagine something like a response timeout (in an already-established connection) could also signal some kind of error. 


That'd also be a bug, IMO.  We can expect bugs to behave abnormally.


Sometimes it's useful to perform cleanup properly anyway. If feasible.


And as for "bug of the code", I'm saying that there must be some code
that can hog the CPU (the comment refers to it), and we might want to
handle that carefully.


A simple C-g should theoretically take handle that carefully.


That also speaks for removing the cleanup code from url-http-debug, I think.

>> Simply waiting for a some amount of time tends to get the problem
>> "unstuck", though the improvement is gradual and fairly unpredictable.
>
> Is it related in any way with the outstanding connections being
> completed/closed?  What does netstat show?
Feel free to suggest a particular invocation, but here's some results. I'm calling it while filtering out some irrelevant programs: 

netstat -tp --wide | grep -v qbittorrent | grep -v ...

Output at the beginning, when everything seems okay:

Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 300 zappa:53781 cust-138-33-109-94.dyn.as47377.net:23048 FIN_WAIT1 - tcp 0 0 zappa:54612 mrs08s03-in-f10.1e100.net:https TIME_WAIT - tcp 0 1 zappa:33575 ec2-3-83-213-10.compute-1.amazonaws.com:49839 FIN_WAIT1 - tcp 0 1 zappa:55515 svaio-12.dyn.pool1.garodo.net:6881 SYN_SENT - tcp 0 69 zappa:48829 cust-138-33-109-94.dyn.as47377.net:20142 FIN_WAIT1 - 

Here's the output right after I repro'd the problem:
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 69 zappa:44551 cust-138-33-109-94.dyn.as47377.net:20142 FIN_WAIT1 - tcp 0 0 zappa:50064 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:50066 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55858 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55930 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:50076 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55928 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 1 zappa:48910 ns345059.ip-176-31-225.eu:http LAST_ACK - tcp 0 0 zappa:55926 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55856 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:38389 nz184l178.bb122100.ctm.net:32766 TIME_WAIT - tcp 0 516 zappa:46189 S0106f0f249850973.wp.shawcable.net:62318 LAST_ACK - tcp 0 0 zappa:50062 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55920 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:50068 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:50070 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55922 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55832 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55924 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:34997 ec2-3-83-213-10.compute-1.amazonaws.com:49839 FIN_WAIT2 - tcp 0 0 zappa:50074 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:50072 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs 

Here it is after a few minutes has passed:

(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 69 zappa:44551 cust-138-33-109-94.dyn.as47377.net:20142 FIN_WAIT1 - tcp 0 0 zappa:50064 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:50066 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55858 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55930 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:50076 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55928 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:54792 mrs08s03-in-f10.1e100.net:https TIME_WAIT - tcp 0 0 zappa:55926 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55856 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:50062 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55920 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:50068 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:50070 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55922 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55832 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:55924 mrs08s04-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:50074 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs tcp 0 0 zappa:50072 mrs08s02-in-f4.1e100.net:http ESTABLISHED 4594/src/emacs 

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