systemd-resolved emits totally useless warning

[Mikko Rantalainen]

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.

[Mikko Rantalainen (mira)]

Maybe related: bug 1796501

[Mikko Rantalainen (mira)]

Maybe related: bug 1785383