[Bug 1886163] Re: systemd-resolved emits totally useless warning

[Mikko Rantalainen]

Maybe related: bug 1785383

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Title:
  systemd-resolved emits totally useless warning

Status in systemd package in Ubuntu:
  New

Bug description:
  With systemd-resolved taking care of resolving DNS requests, it will
  emit following warning message when domain fails to resolve:

  Jul 02 07:19:22 balancer1 systemd-resolved[1269]: Server returned
  error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001,
  retrying transaction with reduced feature level UDP.

  This warning message is missing information about the process that's
  trying to resolve a domain and (this part is the more important bit)
  information about the domain that systemd-resolved is trying to
  resolve in the first place.

  If the warning message cannot be made meaningful, it should be dropped
  for good. I'd prefer to log at least the domain name that was being
  tried to be resolved. Having pid and name of the process that needed
  the information would be a plus.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: systemd 245.4-4ubuntu3.1
  ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
  Uname: Linux 5.4.0-33-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.2
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Fri Jul  3 11:59:22 2020
  InstallationDate: Installed on 2019-05-22 (407 days ago)
  InstallationMedia: Ubuntu-Server 16.04.6 LTS "Xenial Xerus" - Release amd64 (20190226)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 002: ID 413c:a001 Dell Computer Corp. Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Lsusb-t:
   /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/10p, 5000M
   /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M
       |__ Port 3: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
  MachineType: Dell Inc. PowerEdge R230
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-33-generic root=UUID=41607337-6732-464c-b97c-429504aa1b23 ro
  SourcePackage: systemd
  UpgradeStatus: Upgraded to focal on 2020-06-01 (31 days ago)
  dmi.bios.date: 12/06/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.6.1
  dmi.board.name: 0FRVY0
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A06
  dmi.chassis.asset.tag: lb1.peda.net
  dmi.chassis.type: 23
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr2.6.1:bd12/06/2018:svnDellInc.:pnPowerEdgeR230:pvr:rvnDellInc.:rn0FRVY0:rvrA06:cvnDellInc.:ct23:cvr:
  dmi.product.name: PowerEdge R230
  dmi.product.sku: SKU=NotProvided;ModelName=PowerEdge R230
  dmi.sys.vendor: Dell Inc.

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