[Bug 2047155] Re: "Could not create socket" with apt update when update libc6 to 2.35-0ubuntu3.5 and using nscd

[James Dingwall]

Here is a short test program which demonstrates behaviour with/without
nscd:

#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <arpa/inet.h>


extern
int main(int argc, char *argv[])
{
    struct addrinfo hints;
    struct addrinfo *rp, *result;
    struct sockaddr *sa;
    int rc;
    char s[INET6_ADDRSTRLEN];
    size_t slen = sizeof(s);

    memset(&hints, 0, sizeof(hints));

    switch(atoi(argv[1])) {
    case 4:
        hints.ai_family = AF_INET;
        break;
    case 6:
        hints.ai_family = AF_INET6;
        break;
    default:
        hints.ai_family = AF_UNSPEC;
        break;
    }

    rc = getaddrinfo(argv[2], NULL, &hints, &result);
    if(rc) {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rc));
        exit(EXIT_FAILURE);
    }

    for (rp = result; rp != NULL; rp = rp->ai_next) {
        sa = rp->ai_addr;
        switch(sa->sa_family) {
             case AF_INET:
                 inet_ntop(AF_INET, &(((struct sockaddr_in *)sa)->sin_addr), s, slen);
                 fprintf(stderr, "result (IPv4): %s\n", s);
                 break;
             case AF_INET6:
                 inet_ntop(AF_INET6, &(((struct sockaddr_in6 *)sa)->sin6_addr), s, slen);
                 fprintf(stderr, "result (IPv6): %s\n", s);
                 break;
             default:
                 fprintf(stderr, "Unknown AF: %d\n", sa->sa_family);
                 break;
        }
    }

    return 0;
}


nscd running:

$ ./a.out 0 ap1.example.com
result (IPv6): x:x:x:x::x:c
result (IPv6): x:x:x:x::x:c
result (IPv6): x:x:x:x::x:c
result (IPv4): x.x.x.12
result (IPv4): x.x.x.12
result (IPv4): x.x.x.12
$ ./a.out 4 ap1.example.com
result (IPv4): x.x.x.12
result (IPv4): x.x.x.12
result (IPv4): x.x.x.12
$ ./a.out 6 ap1.example.com
Unknown AF: 0
Unknown AF: 0
Unknown AF: 0


nscd not running:

$ ./a.out 0 ap1.example.com
result (IPv6): x:x:x:x::x:c
result (IPv6): x:x:x:x::x:c
result (IPv6): x:x:x:x::x:c
result (IPv4): x.x.x.12
result (IPv4): x.x.x.12
result (IPv4): x.x.x.12
$ ./a.out 4 ap1.example.com
result (IPv4): x.x.x.12
result (IPv4): x.x.x.12
result (IPv4): x.x.x.12
$ ./a.out 6 ap1.example.com
result (IPv6): x:x:x:x::x:c
result (IPv6): x:x:x:x::x:c
result (IPv6): x:x:x:x::x:c

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https://bugs.launchpad.net/bugs/2047155

Title:
  "Could not create socket" with apt update when update libc6 to
  2.35-0ubuntu3.5 and using nscd

Status in glibc package in Ubuntu:
  Confirmed

Bug description:
  1) lsb_release -rd
  Description:	Ubuntu 22.04.3 LTS
  Release:	22.04

  2) apt-cache policy libc6
  libc6:
    Installed: 2.35-0ubuntu3.5
    Candidate: 2.35-0ubuntu3.5
    Version table:
   *** 2.35-0ubuntu3.5 500
          500 http://archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu jammy-security/main amd64 Packages
          100 /var/lib/dpkg/status
       2.35-0ubuntu3 500
          500 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages

  3) apt-get update or apt update are successfully done.

  4) Could not create a socket and failure command.
  Error messages are followings.

  $ sudo apt update 
  Ign:1 http://archive.ubuntu.com/ubuntu jammy InRelease
  Ign:2 http://archive.ubuntu.com/ubuntu jammy-updates InRelease
  Ign:3 http://archive.ubuntu.com/ubuntu jammy-backports InRelease
  Ign:4 http://archive.ubuntu.com/ubuntu jammy-security InRelease
  Err:5 http://archive.ubuntu.com/ubuntu jammy Release
    Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol)
  Err:6 http://archive.ubuntu.com/ubuntu jammy-updates Release
    Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol)
  Err:7 http://archive.ubuntu.com/ubuntu jammy-backports Release
    Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol)
  Err:8 http://archive.ubuntu.com/ubuntu jammy-security Release
    Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol) Could not create a socket for  (f=0 t=1 p=6) - socket (97: Address family not supported by protocol)
  Reading package lists... Done
  E: The repository 'http://archive.ubuntu.com/ubuntu jammy Release' does not have a Release file.
  N: Updating from such a repository can't be done securely, and is therefore disabled by default.
  N: See apt-secure(8) manpage for repository creation and user configuration details.
  E: The repository 'http://archive.ubuntu.com/ubuntu jammy-updates Release' does not have a Release file.
  N: Updating from such a repository can't be done securely, and is therefore disabled by default.
  N: See apt-secure(8) manpage for repository creation and user configuration details.
  E: The repository 'http://archive.ubuntu.com/ubuntu jammy-backports Release' does not have a Release file.
  N: Updating from such a repository can't be done securely, and is therefore disabled by default.
  N: See apt-secure(8) manpage for repository creation and user configuration details.
  E: The repository 'http://archive.ubuntu.com/ubuntu jammy-security Release' does not have a Release file.
  N: Updating from such a repository can't be done securely, and is therefore disabled by default.
  N: See apt-secure(8) manpage for repository creation and user configuration details.

  To reproduce
  * Install OS
  * Having only IPv6 interface
  * Install nscd
  * Upgrade libc6 to 2.35-0ubuntu3.5

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