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From: Eric Abrahamsen <eric@ericabrahamsen.net>
To: Robert Pluim <rpluim@gmail.com>
Cc: Lars Ingebrigtsen <larsi@gnus.org>,
	 Christian Barthel <bch@online.de>,
	ding@gnus.org
Subject: Re: new wifi connection = nntp timeout = Emacs restart?
Date: Mon, 04 May 2020 08:38:00 -0700	[thread overview]
Message-ID: <87bln3ogmf.fsf@ericabrahamsen.net> (raw)
In-Reply-To: <m2imhbuaiw.fsf@gmail.com> (Robert Pluim's message of "Mon, 04 May 2020 14:53:11 +0200")

Robert Pluim <rpluim@gmail.com> writes:

>>>>>> On Thu, 30 Apr 2020 15:11:38 -0700, Eric Abrahamsen
> <eric@ericabrahamsen.net> said:
>
>     >> A DNS lookup failing should never make Gnus hang, so that's pretty
>     >> surprising.
>
>     Eric> This error comes in `nntp-open-connection', as the
>     Eric> condition-case error
>     Eric> caught from `open-network-stream'. I only just realized that's a lisp
>     Eric> function, but looking at it we should be using
>     Eric> `make-network-process'.
>
> Iʼd rather you didnʼt move in that direction. 'make-network-process'
> is low-level plumbing, 'open-network-stream' is what user code should
> be using. What feature is 'open-network-stream' missing for you?

Sorry, that was a very poorly-written sentence. What I meant was that
`open-network-stream' *does* use `make-network-process' internally, and
the hang is happening inside C code, not Lisp code. That was all I was
trying to say.

> Eric> The DNS lookup isn't hanging (or hanging Gnus) so much as it
>     Eric> is taking a
>     Eric> long time to fail, and then _continuing to fail until Emacs is
>     Eric> restarted_.
>
>     Eric> So I'm hoping this is unrelated to Gnus, and actually a problem with
>     Eric> Emacs caching the DNS server it's trying to use, which is later
>     Eric> unavailable on a new network. (But then why would I only see
>     Eric> this with
>     Eric> Gnus nntp connections? On the other hand, all my nnimap
>     Eric> connections are
>     Eric> localhost, nntp is my only non-local Gnus network connection.)
>
> Emacs doesnʼt directly address the DNS server, it uses getaddrinfo or
> getaddrinfo_a, which means any caching going on is in the IP
> stack. Although given that this is being seen on GNU/Linux and macOS,
> it may well be emacs at fault.
>
> Also, I see this when coming out of sleep and connecting to the same
> wifi network, with the same IP, and the same DNS server, which I guess
> implicates Emacs more.

I really don't know very much about networking, unfortunately. I'm just
trying to provide debugging data, possibly leads, baseless speculation,
and red herrings.

Eric


  parent reply	other threads:[~2020-05-04 15:38 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-16 17:37 Eric Abrahamsen
2020-04-17 11:46 ` Eric S Fraga
2020-04-17 12:20   ` Gijs Hillenius
2020-04-17 12:26     ` Andreas Schwab
2020-04-17 14:51       ` Eric Abrahamsen
2020-04-17 15:38         ` David Engster
2020-04-17 16:35           ` Eric Abrahamsen
2020-04-19  6:37 ` Christian Barthel
2020-04-19 17:32   ` Eric Abrahamsen
2020-04-19 18:02     ` Robert Pluim
2020-04-19 21:23       ` Eric Abrahamsen
2020-04-19 22:10       ` Eric Abrahamsen
2020-04-20  4:54         ` Eric Abrahamsen
2020-04-20  7:40         ` Andreas Schwab
2020-04-20 15:45           ` Eric Abrahamsen
2020-04-20 15:54             ` Robert Pluim
2020-04-20 18:24               ` Eric Abrahamsen
2020-04-21  8:36                 ` Alberto Luaces
2020-04-21 15:53                   ` Eric Abrahamsen
2020-04-22  7:37                     ` Alberto Luaces
2020-04-22  8:28                       ` Alberto Luaces
2020-04-30  5:26       ` Lars Ingebrigtsen
2020-04-30 17:34         ` Eric Abrahamsen
2020-04-30 21:49           ` Lars Ingebrigtsen
2020-04-30 22:11             ` Eric Abrahamsen
2020-05-04 12:53               ` Robert Pluim
2020-05-04 13:13                 ` Andreas Schwab
2020-05-04 13:33                   ` Robert Pluim
2020-05-04 14:35                     ` Andreas Schwab
2020-05-04 14:46                       ` Robert Pluim
2020-05-04 15:10                         ` Andreas Schwab
2020-05-04 16:29                           ` Robert Pluim
2020-05-04 14:51                 ` Lars Ingebrigtsen
2020-05-04 16:13                   ` Robert Pluim
2020-05-04 16:36                     ` Eric Abrahamsen
2020-05-04 17:21                       ` Robert Pluim
2020-05-04 18:01                         ` Lars Ingebrigtsen
2020-05-05  7:41                           ` new wifi connection = nntp timeout = Emacs restart?, " Robert Pluim
2020-05-05  8:19                             ` Lars Ingebrigtsen
2020-05-05 11:55                               ` Robert Pluim
2020-05-19 13:34                                 ` Lars Ingebrigtsen
2020-05-19 13:36                                 ` Lars Ingebrigtsen
2020-05-04 18:47                         ` Eric Abrahamsen
2020-05-04 15:38                 ` Eric Abrahamsen [this message]
2020-05-04 16:28                   ` Robert Pluim
2020-04-30 17:38         ` Eric Abrahamsen
2020-04-30 21:51           ` Lars Ingebrigtsen
2020-04-30 22:26             ` Eric Abrahamsen
2020-04-30 22:28               ` Lars Ingebrigtsen
2020-04-30 22:39                 ` Eric Abrahamsen
2020-04-30 22:55                   ` Lars Ingebrigtsen
2020-04-30 23:13                     ` Eric Abrahamsen
2020-04-30 23:23                       ` Lars Ingebrigtsen
2020-05-01  9:46                         ` David Engster
2020-05-01 10:35                           ` David Engster
2020-05-01 17:29                             ` Eric Abrahamsen
2020-05-01 20:51                               ` David Engster
2020-05-02  0:33                                 ` Eric Abrahamsen
2020-05-02 10:20                                   ` David Engster
2020-05-02 15:13                                     ` Eric Abrahamsen
2020-05-02 16:50                                       ` David Engster
2020-05-02 19:07                                         ` Eric Abrahamsen
2020-05-19 13:23                                           ` Lars Ingebrigtsen
2020-05-21  0:45                                             ` Eric Abrahamsen
2020-06-26  9:38                                               ` Lars Ingebrigtsen
2020-08-21 20:47                             ` Eric Abrahamsen
2020-05-01 18:06                         ` Eric Abrahamsen

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