Received: (at 40748) by debbugs.gnu.org; 14 Jun 2021 14:02:17 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Jun 14 10:02:17 2021 Received: from localhost ([127.0.0.1]:47280 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1lsnAP-0003Bg-Es for submit <at> debbugs.gnu.org; Mon, 14 Jun 2021 10:02:17 -0400 Received: from quimby.gnus.org ([95.216.78.240]:38196) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <larsi@HIDDEN>) id 1lsnAN-00035r-AL; Mon, 14 Jun 2021 10:02:15 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnus.org; s=20200322; h=Content-Type:MIME-Version:Message-ID:In-Reply-To:Date: References:Subject:Cc:To:From:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=Ae7QFlPgP/fUAiQpJF9JU2XL1hxK0pEin51ewVWrGF8=; b=PGIB7m6aZDLfSwGBM9sEKAgk4M B5FJmJ7svC1e68TRtqh0N7MfAjPKFSAz3NY9obJSwUvmclY91zt9vG5gK00OpVOqRQyyje7CxnsS8 68jiz2FbNQCCPqyn11Elx1WmzXKkJoFqc0j1fNSi0058spuuaDCSHwrVnfLCnPGZi7Qo=; Received: from cm-84.212.220.105.getinternet.no ([84.212.220.105] helo=xo) by quimby.gnus.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from <larsi@HIDDEN>) id 1lsnAB-0001Vf-FQ; Mon, 14 Jun 2021 16:02:09 +0200 From: Lars Ingebrigtsen <larsi@HIDDEN> To: Dmitry Alexandrov <dag@HIDDEN> Subject: Re: bug#40748: 28.0.50; Switching wifi networks hangs dns lookups References: <1rnogg6b.dag@HIDDEN> <87y2neh2zr.fsf@HIDDEN> X-Now-Playing: 75 Dollar Bill's _I Was Real_: "I Was Real" Date: Mon, 14 Jun 2021 16:02:02 +0200 In-Reply-To: <87y2neh2zr.fsf@HIDDEN> (Lars Ingebrigtsen's message of "Mon, 20 Jul 2020 12:53:12 +0200") Message-ID: <87wnqwy279.fsf_-_@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Report: Spam detection software, running on the system "quimby.gnus.org", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Lars Ingebrigtsen <larsi@HIDDEN> writes: > So I'm not sure how this can be an Emacs bug -- as far as I know, > there's no way for libc clients to say "update all the DNS stuff now"; > it's supposed to happen automatically when you call getad [...] Content analysis details: (-2.9 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 40748 Cc: 40748 <at> debbugs.gnu.org, 41234 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.7 (-) Lars Ingebrigtsen <larsi@HIDDEN> writes: > So I'm not sure how this can be an Emacs bug -- as far as I know, > there's no way for libc clients to say "update all the DNS stuff now"; > it's supposed to happen automatically when you call getaddrinfo. (If > I'm wrong, somebody please correct me.) This was almost a year ago -- does anybody have any further input here? If not, I'm not sure there's anything we can do from the Emacs side here... -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no
bug-gnu-emacs@HIDDEN:bug#40748; Package emacs.
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From: Dmitry Alexandrov <dag@HIDDEN>
To: Eric Abrahamsen <eric@HIDDEN>
Subject: Re: bug#40748: 28.0.50; Switching wifi networks hangs dns lookups
In-Reply-To: <878sio3gtd.fsf@HIDDEN> (Eric Abrahamsen's message of
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> I often have trouble reconnecting Gnus' nntp servers after sleeping the l=
aptop in one location, and waking it up in another, connecting to a new wif=
i network
> I edebugged `nntp-open-connection', and realized that the error =E2=80=B9=
=E2=80=A6=E2=80=BA is actually a dns error:
Looks familiar!
> Here's the code that opens the connection; in my case it's nntp-open-netw=
ork-stream/network.
Could not it actually be an even deeper issue I outlined in bug#41234: 27.0=
.91; Synchronous network requests are failing with =E2=80=9CName or service=
not known=E2=80=9D [1]?
[1] <mid:1rnogg6b.dag@HIDDEN>
<https://bugs.gnu.org/41234>
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From: Eric Abrahamsen <eric@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 28.0.50; Switching wifi networks hangs dns lookups
Date: Tue, 21 Apr 2020 10:10:54 -0700
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I'm on Emacs master, but this behavior has been evident for quite some
time, a year or two I think.
I often have trouble reconnecting Gnus' nntp servers after sleeping the
laptop in one location, and waking it up in another, connecting to a new
wifi network (I'm using Arch linux, if it matters).
I edebugged `nntp-open-connection', and realized that the error (which
is getting handled by `nnheader-report', that's why I didn't notice it)
is actually a dns error:
(error "news.gmane.io/nntp Temporary failure in name resol...")
Other Emacs network connections behave as normal. But this error for
this particular server persists until I restart Emacs.
Are DNS lookups cached? Cached per connection? Is there anything we can
do to flush whatever's "stuck"?
Here's the code that opens the connection; in my case it's
nntp-open-network-stream/network.
Happy to help with further debugging!
(let ((coding-system-for-read 'binary)
(coding-system-for-write 'binary)
(map '((nntp-open-network-stream network)
(network-only plain) ; compat
(nntp-open-plain-stream plain)
(nntp-open-ssl-stream tls)
(nntp-open-tls-stream tls))))
(if (assoc nntp-open-connection-function map)
(open-network-stream
"nntpd" pbuffer nntp-address nntp-port-number
:type (cadr (assoc nntp-open-connection-function map))
:end-of-command "^\\([2345]\\|[.]\\).*\n"
:capability-command "HELP\r\n"
:success "^3"
:starttls-function
(lambda (capabilities)
(if (not (string-match "STARTTLS" capabilities))
nil
"STARTTLS\r\n")))
(funcall nntp-open-connection-function pbuffer)))
Eric Abrahamsen <eric@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#40748; Package emacs.
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