Lars Ingebrigtsen <larsi@HIDDEN>
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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
"Tue, 21 Apr 2020 10:10:54 -0700")
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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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bug-gnu-emacs@HIDDEN:bug#40748; Package emacs.
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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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