ss outputs lots of trailing spaces

[Roman Odaisky]

$ ss -atn | head -n 5 | tr ' ' '_'
State__Recv-Q_Send-Q___________Local_Address:Port_____________Peer_Address:Port_Process_________________________________________________________________________
LISTEN_0______4096_____________127.0.0.53%lo:53____________________0.0.0.0:*____________________________________________________________________________________
LISTEN_0______224__________________127.0.0.1:5430__________________0.0.0.0:*____________________________________________________________________________________
LISTEN_0______128____________________0.0.0.0:22____________________0.0.0.0:*____________________________________________________________________________________
LISTEN_0______5____________________127.0.0.1:631___________________0.0.0.0:*____________________________________________________________________________________

These trailing spaces cause problems when piping ss output through grep or anything else unless the terminal window is very wide. The spaces are present even when stdout is a terminal, indeed if I maximize my terminal window (its width becomes a very reasonable 172 characters) and run ss without arguments, the output is interleaved with blank lines. env -i changes nothing.

The spaces should be trimmed before output regardless of whether stdout is a terminal.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: iproute2 5.5.0-1ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-37.41-generic 5.4.41
Uname: Linux 5.4.0-37-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Wed Jul 22 14:05:53 2020
SourcePackage: iproute2
UpgradeStatus: Upgraded to focal on 2020-04-26 (86 days ago)