GNU bug report logs - #41234
27.0.91; Synchronous network requests are failing with “Name or service not known”

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Package: emacs; Reported by: Dmitry Alexandrov <dag@HIDDEN>; merged with #40748; dated Wed, 13 May 2020 15:01:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Forcibly Merged 40748 41234. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Dmitry Alexandrov <dag@HIDDEN>
Subject: Re: bug#41234: 27.0.91; Synchronous network requests are failing
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References: <1rnogg6b.dag@HIDDEN>
Date: Mon, 20 Jul 2020 12:53:12 +0200
In-Reply-To: <1rnogg6b.dag@HIDDEN> (Dmitry Alexandrov's message of "Wed, 13
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 Content preview: Dmitry Alexandrov <dag@HIDDEN> writes: >
 (make-network-process
 :name " *net-test*" > :buffer (get-buffer-create " *net-test*") > :host
 "gnu.org" :service 80 > :nowait nil) > ; ;
 Debugger entered--Lisp error: (error "gnu.org/80
 Name or servi [...] 
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Dmitry Alexandrov <dag@HIDDEN> writes:

> 	(make-network-process :name " *net-test*"
> 						  :buffer (get-buffer-create " *net-test*")
> 						  :host "gnu.org" :service 80
> 						  :nowait nil)
> 	;; Debugger entered--Lisp error: (error "gnu.org/80 Name or service not =
known")
>
> More specifically, a call to getaddrinfo() in =E2=80=98network_lookup_add=
ress_info_1=E2=80=99 returns EAI_NONAME.
>
> Could it be a problem in GNU Emacs, or have I broken my system somehow?

Dmitry Alexandrov <dag@HIDDEN> writes:

> FWIW, strace suggests, that the problematic Emacs process is trying to
> connect to an outdated nameserver (from a LAN this machine was
> connected once):

[...]

> That is, that /etc/resolv.conf had not been reread (there is nothing
> about it in the skipped output above), while the instance that is
> working fine do check whether /etc/resolv.conf is updated:

Hm...   since the async lookups work, I guess this means that
getaddrinfo_a works, but getaddrinfo doesn't?  Which is very odd -- both
functions are supposed to update the name server etc in the same way, I
think?

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.)

--=20
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#41234; Package emacs. Full text available.
bug Marked as found in versions 28.0.50. Request was from Dmitry Alexandrov <dag@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Dmitry Alexandrov <dag@HIDDEN>
To: 41234 <at> debbugs.gnu.org
Subject: Re: bug#41234: 27.0.91; Synchronous network requests are failing
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References: <1rnogg6b.dag@HIDDEN> <7dxdbb7m.dag@HIDDEN>
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found 41234 28.0.50
thanks

Dmitry Alexandrov <dag@HIDDEN> wrote:
> FWIW, strace suggests, that the problematic Emacs process is trying to co=
nnect to an outdated nameserver (from a LAN this machine was connected once=
):

> That is, that /etc/resolv.conf had not been reread...

Heh.  Emacs is able to lost running nscd(8) and fall back to outdated names=
erver as well:

        =E2=80=A6
	openat(AT_FDCWD, "/etc/hosts", O_RDONLY|O_CLOEXEC) =3D 7
	lseek(7, 0, SEEK_CUR)                   =3D 0
	fstat(7, {st_mode=3DS_IFREG|0644, st_size=3D184, ...}) =3D 0
	read(7, "127.0.0.1\tlocalhost\n127.0.1.1\tno"..., 4096) =3D 184
	lseek(7, 0, SEEK_CUR)                   =3D 184
	read(7, "", 4096)                       =3D 0
	close(7)                                =3D 0
	socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) =3D 7
	connect(7, {sa_family=3DAF_INET, sin_port=3Dhtons(53), sin_addr=3Dinet_add=
r("192.168.43.245")}, 16) =3D 0
	gettimeofday({tv_sec=3D1593704775, tv_usec=3D183050}, NULL) =3D 0
	poll([{fd=3D7, events=3DPOLLOUT}], 1, 0)    =3D 1 ([{fd=3D7, revents=3DPOL=
LOUT}])
	sendto(7, "\254o\1\0\0\1\0\0\0\0\0\0\3gnu\3org\0\0\1\0\1", 25, MSG_NOSIGNA=
L, NULL, 0) =3D 25
        =E2=80=A6

=E2=80=94 that=CA=BCs instead of:

        =E2=80=A6
	socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) =3D 10
	connect(10, {sa_family=3DAF_UNIX, sun_path=3D"/var/run/nscd/socket"}, 110)=
 =3D 0
	sendto(10, "\2\0\0\0\16\0\0\0\t\0\0\0gnus.org\0", 21, MSG_NOSIGNAL, NULL, =
0) =3D 21
        =E2=80=A6

in a freshly started Emacs instance.

Perhaps, I have to try another workaround.

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Information forwarded to bug-gnu-emacs@HIDDEN:
bug#41234; Package emacs. Full text available.

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From: Dmitry Alexandrov <dag@HIDDEN>
To: 41234 <at> debbugs.gnu.org
Subject: Re: bug#41234: 27.0.91; Synchronous network requests are failing
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FWIW, strace suggests, that the problematic Emacs process is trying to conn=
ect to an outdated nameserver (from a LAN this machine was connected once):

	=E2=80=A6
	openat(AT_FDCWD, "/etc/hosts", O_RDONLY|O_CLOEXEC) =3D 12
	lseek(12, 0, SEEK_CUR)                  =3D 0
	fstat(12, {st_mode=3DS_IFREG|0644, st_size=3D184, ...}) =3D 0
	read(12, "127.0.0.1\tlocalhost\n127.0.1.1\tno"..., 4096) =3D 184
	lseek(12, 0, SEEK_CUR)                  =3D 184
	read(12, "", 4096)                      =3D 0
	close(12)                               =3D 0
	socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) =3D 12
	connect(12, {sa_family=3DAF_INET, sin_port=3Dhtons(53), sin_addr=3Dinet_ad=
dr("192.168.1.1")}, 16) =3D 0
	gettimeofday({tv_sec=3D1589546464, tv_usec=3D72520}, NULL) =3D 0
	poll([{fd=3D12, events=3DPOLLOUT}], 1, 0)   =3D 1 ([{fd=3D12, revents=3DPO=
LLOUT}])
	sendto(12, "`\t\1\0\0\1\0\0\0\0\0\0\3gnu\3org\0\0\1\0\1", 25, MSG_NOSIGNAL=
, NULL, 0) =3D 25
	=E2=80=A6

That is, that /etc/resolv.conf had not been reread (there is nothing about =
it in the skipped output above), while the instance that is working fine do=
 check whether /etc/resolv.conf is updated:

	=E2=80=A6
	stat("/etc/resolv.conf", {st_mode=3DS_IFREG|0644, st_size=3D56, ...}) =3D 0
	openat(AT_FDCWD, "/etc/hosts", O_RDONLY|O_CLOEXEC) =3D 11
	lseek(11, 0, SEEK_CUR)                  =3D 0
	fstat(11, {st_mode=3DS_IFREG|0644, st_size=3D184, ...}) =3D 0
	read(11, "127.0.0.1\tlocalhost\n127.0.1.1\tno"..., 4096) =3D 184
	lseek(11, 0, SEEK_CUR)                  =3D 184
	read(11, "", 4096)                      =3D 0
	close(11)                               =3D 0
	socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) =3D 11
	connect(11, {sa_family=3DAF_INET, sin_port=3Dhtons(53), sin_addr=3Dinet_ad=
dr("192.168.43.223")}, 16) =3D 0
	gettimeofday({tv_sec=3D1589546877, tv_usec=3D860209}, NULL) =3D 0
	poll([{fd=3D11, events=3DPOLLOUT}], 1, 0)   =3D 1 ([{fd=3D11, revents=3DPO=
LLOUT}])
	sendmmsg(11, [{msg_hdr=3D{msg_name=3DNULL, msg_namelen=3D0, msg_iov=3D[{io=
v_base=3D"\314\255\1\0\0\1\0\0\0\0\0\0\3gnu\3org\0\0\1\0\1", iov_len=3D25}]=
, msg_iovlen=3D1, msg_controllen=3D0, msg_flags=3D0}, msg_len=3D25}, {msg_h=
dr=3D{msg_name=3DNULL, msg_namelen=3D0, msg_iov=3D[{iov_base=3D"\10\270\1\0=
\0\1\0\0\0\0\0\0\3gnu\3org\0\0\34\0\1", iov_len=3D25}], msg_iovlen=3D1, msg=
_controllen=3D0, msg_flags=3D0}, msg_len=3D25}], 2, MSG_NOSIGNAL) =3D 2
	=E2=80=A6

How should I interpret this?

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From: Dmitry Alexandrov <dag@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 27.0.91; Synchronous network requests are failing with
 =?utf-8?Q?=E2=80=9CName?= or service not =?utf-8?Q?known=E2=80=9D?=
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.91 (gnu/linux)
Date: Wed, 13 May 2020 15:42:04 +0300
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Dear maintainers,

I=CA=BCm not sure whether that a bugreport or a support request, I hope you=
 will excuse me for opting for the former.

Basically, I have an instance of Emacs 27 =E2=80=94 rev. aea1b4db72 =E2=80=
=94 a head of emacs-27 from about two weeks ago, which, have been running f=
or that time, is failing to resolve any remote hostname synchronously (whic=
h, for instance, Gnus normally does), while asynchronous requests (as in =
=E2=80=98url-retrieve=E2=80=99) are still working fine.

A newly started instance of the same Emacs does not demonstrate the issue. =
 And alas, despite being almost convinced, that I had already met this prob=
lem before, I cannot say how exactly to reproduce it.

However, I suppose, the fact, that this is by no means a pristine configura=
tion is not much relevant, since the error goes down to C sources, namely t=
o =E2=80=98make-network-process=E2=80=99:

	(make-network-process :name " *net-test*"
						  :buffer (get-buffer-create " *net-test*")
						  :host "gnu.org" :service 80
						  :nowait nil)
	;; Debugger entered--Lisp error: (error "gnu.org/80 Name or service not kn=
own")

More specifically, a call to getaddrinfo() in =E2=80=98network_lookup_addre=
ss_info_1=E2=80=99 returns EAI_NONAME.

Could it be a problem in GNU Emacs, or have I broken my system somehow?

=2D-=20
In GNU Emacs 27.0.91 (build 2, x86_64-pc-linux-gnu)
 of 2020-04-30 built on nora
Repository revision: aea1b4db72df92595a3f642d18bf57254d74772b
Repository branch: emacs-27-nightly
System Description: Debian GNU/Linux 10 (buster)

Configured using:
 'configure --with-x-toolkit=3Dno'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND GPM DBUS GSETTINGS GLIB NOTIFY INOTIFY ACL=
 LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF XFT ZLIB OLDXM=
ENU X11 XDBE XIM MODULES THREADS LIBSYSTEMD PDUMPER LCMS2 GMP

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--=-=-=--
Acknowledgement sent to Dmitry Alexandrov <dag@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#41234; Package emacs. Full text available.
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