7z doesn't create an archive

[c3d]

Description: Ubuntu 16.04.3 LTS
Release: 16.04

p7zip:
  Installé : 9.20.1~dfsg.1-4.2
  Candidat : 9.20.1~dfsg.1-4.2
 Table de version :
 *** 9.20.1~dfsg.1-4.2 500
        500 http://tw.archive.ubuntu.com/ubuntu xenial/universe i386 Packages
        100 /var/lib/dpkg/status

Normally, p7zip analyses the files to compress and create an archive.

Now, it analyses the files to compress but get stuck at that stage while CPU gets to 100%

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: p7zip-full 9.20.1~dfsg.1-4.2
ProcVersionSignature: Ubuntu 4.4.0-109.132-generic 4.4.98
Uname: Linux 4.4.0-109-generic i686
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: i386
CurrentDesktop: XFCE
Date: Sun Jan 21 10:34:17 2018
Dependencies:
 gcc-5-base 5.4.0-6ubuntu1~16.04.5
 gcc-6-base 6.0.1-0ubuntu1
 libc6 2.23-0ubuntu10
 libgcc1 1:6.0.1-0ubuntu1
 libstdc++6 5.4.0-6ubuntu1~16.04.5
EcryptfsInUse: Yes
ExecutablePath: /usr/lib/p7zip/7z
InstallationDate: Installed on 2017-05-23 (242 days ago)
InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release i386 (20160420.1)
SourcePackage: p7zip
UpgradeStatus: No upgrade log present (probably fresh install)