[Bug 1822416] Re: resolve: do not hit CNAME or DNAME entry in NODATA cache

[Jorge Niedbalski]

** Also affects: systemd (Ubuntu Eoan)
   Importance: Undecided
       Status: New

** Also affects: systemd (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: systemd (Ubuntu Focal)
   Importance: Undecided
       Status: Confirmed

** Also affects: systemd (Ubuntu Disco)
   Importance: Undecided
       Status: New

** This bug is no longer a duplicate of bug 1818527
   Stub resolver cache is corrupted

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Title:
  resolve: do not hit CNAME or DNAME entry in NODATA cache

Status in systemd package in Ubuntu:
  Confirmed
Status in systemd source package in Bionic:
  New
Status in systemd source package in Disco:
  New
Status in systemd source package in Eoan:
  New
Status in systemd source package in Focal:
  Confirmed

Bug description:
  The question: DNS A record lookups fail to resolve due to cached CNAME
  NODATA lookups ...

  https://askubuntu.com/questions/1063462/18-04-server-systemd-resolve-
  returns-cached-cname-nodata-for-a-lookup

  Upstream at Github: Systemd issue 998 - Cached cname NODATA returned
  for A lookup ...

  https://github.com/systemd/systemd/issues/9833

  
  Please patch ...

  https://github.com/systemd/systemd/commit/3740146a4cbd99883af79e375ee4836206dcea4e

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