[Bug 2040055] [NEW] systemd-resolved stops resolving host names

[Matthias Nagel]

Public bug reported:

# lsb_release -rd
No LSB modules are available.
Description:    Ubuntu 23.10
Release:        23.10

# aptitude show 'systemd-resolved'
Package: systemd-resolved                
Version: 253.5-1ubuntu6
State: installed

The system is unable to resolve any DNS names. Whenever a DNS name shall
be resolved the following error appears in the journal

Oct 21 15:50:32 my-host.my-domain.tld systemd-resolved[114]: Failed to
start query: Invalid argument

If one manually tries to resolve a DNS name from the local stub resolver
via

dig @127.0.0.53 A www.google.com.

another error message is added to the journal. However, resolving a DNS
name from the configured upstream DNS server works perfectly

dig @81.169.163.106 A www.google.com.

Returns a proper response. (Note, 81.169.163.106 is the internal DNS
server from my hoster.)

Some more infos

# resolvectl 
Global
         Protocols: -LLMNR mDNS=resolve -DNSOverTLS DNSSEC=no/unsupported
  resolv.conf mode: stub
Current DNS Server: 81.169.163.106
       DNS Servers: 81.169.163.106 85.214.7.22
        DNS Domain: my-domain.tld

Link 2 (venet0)
    Current Scopes: none
         Protocols: -DefaultRoute -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported


# cat /etc/systemd/resolved.conf 

[Resolve]
DNS=81.169.163.106 85.214.7.22
Domains=my-domain.tld


# aptitude search '~i resolv'
i   libnss-resolve              - nss module to resolve names via systemd-resolved                                                                        
i A systemd-resolved            - systemd DNS resolver

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2040055

Title:
  systemd-resolved stops resolving host names

Status in systemd package in Ubuntu:
  New

Bug description:
  # lsb_release -rd
  No LSB modules are available.
  Description:    Ubuntu 23.10
  Release:        23.10

  # aptitude show 'systemd-resolved'
  Package: systemd-resolved                
  Version: 253.5-1ubuntu6
  State: installed

  The system is unable to resolve any DNS names. Whenever a DNS name
  shall be resolved the following error appears in the journal

  Oct 21 15:50:32 my-host.my-domain.tld systemd-resolved[114]: Failed to
  start query: Invalid argument

  If one manually tries to resolve a DNS name from the local stub
  resolver via

  dig @127.0.0.53 A www.google.com.

  another error message is added to the journal. However, resolving a
  DNS name from the configured upstream DNS server works perfectly

  dig @81.169.163.106 A www.google.com.

  Returns a proper response. (Note, 81.169.163.106 is the internal DNS
  server from my hoster.)

  Some more infos

  # resolvectl 
  Global
           Protocols: -LLMNR mDNS=resolve -DNSOverTLS DNSSEC=no/unsupported
    resolv.conf mode: stub
  Current DNS Server: 81.169.163.106
         DNS Servers: 81.169.163.106 85.214.7.22
          DNS Domain: my-domain.tld

  Link 2 (venet0)
      Current Scopes: none
           Protocols: -DefaultRoute -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported

  
  # cat /etc/systemd/resolved.conf 

  [Resolve]
  DNS=81.169.163.106 85.214.7.22
  Domains=my-domain.tld

  
  # aptitude search '~i resolv'
  i   libnss-resolve              - nss module to resolve names via systemd-resolved                                                                        
  i A systemd-resolved            - systemd DNS resolver

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