bug#41234: 27.0.91; Synchronous network requests are failing with “Name or service not known”

[Dmitry Alexandrov]

found 41234 28.0.50
thanks

Dmitry Alexandrov <dag@gnui.org> wrote:
> 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 connect to an outdated nameserver (from a LAN this machine was connected 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...

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  Emacs is able to lost running nscd(8) and fall back to outdated 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

        …
        openat(AT_FDCWD, "/etc/hosts", O_RDONLY|O_CLOEXEC) = 7
        lseek(7, 0, SEEK_CUR)                   = 0
        fstat(7, {st_mode=S_IFREG|0644, st_size=184, ...}) = 0
        read(7, "127.0.0.1\tlocalhost\n127.0.1.1\tno"..., 4096) = 184
        lseek(7, 0, SEEK_CUR)                   = 184
        read(7, "", 4096)                       = 0
        close(7)                                = 0
        socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) = 7
        connect(7, {sa_family=AF_INET, sin_port=htons(53), 
sin_addr=inet_addr("192.168.43.245")}, 16) = 0
        gettimeofday({tv_sec=1593704775, tv_usec=183050}, NULL) = 0
        poll([{fd=7, events=POLLOUT}], 1, 0)    = 1 ([{fd=7, revents=POLLOUT}])
        sendto(7, "\254o\1\0\0\1\0\0\0\0\0\0\3gnu\3org\0\0\1\0\1", 25, 
MSG_NOSIGNAL, NULL, 0) = 25
        …

— thatʼs instead of:

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

in a freshly started Emacs instance.

Perhaps, I have to try another workaround.

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