lxqt-policykit-agent crashed with SIGSEGV in g_type_check_instance_is_fundamentally_a()

[ivanto]

:~$ lsb_release -rd
Description: Ubuntu 20.04.1 LTS
Release: 20.04

:~$ apt-cache policy lxqt-policykit
lxqt-policykit:
  Installed: 0.14.1-1ubuntu2
  Candidate: 0.14.1-1ubuntu2
  Table version:
 *** 0.14.1-1ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: lxqt-policykit 0.14.1-1ubuntu2
ProcVersionSignature: Ubuntu 5.4.0-51.56-generic 5.4.65
Uname: Linux 5.4.0-51-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: LXQt
Date: Wed Oct 14 15:17:28 2020
SourcePackage: lxqt-policykit
UpgradeStatus: No upgrade log present (probably fresh install)

[ԜаӀtеr Ⅼарсһуnѕkі (wxl)]

What steps are required to reproduce this?

[ivanto (ivantu)]

I do not understand.

It could happen when I log into graphical software that requires access to the root privileges of the lxqt operating system

In the logs I see messages from:

:~$ dmesg | grep policy
[ 0.561388] AppArmor: AppArmor sha1 policy hashing enabled
[ 106.605930] traps: lxqt-policykit-[2684] general protection fault ip:7fc153acc671 sp:7ffefa6161a8 error:0 in libgobject-2.0.so.0.6400.3[7fc153a9e000+36000]
[ 180.309766] traps: lxqt-policykit-[6084] general protection fault ip:7fde2b1bd671 sp:7fff1ab2ffa8 error:0 in libgobject-2.0.so.0.6400.3[7fde2b18f000+36000]

[ԜаӀtеr Ⅼарсһуnѕkі (wxl)]

And you *always* had this issue? This is included with every copy of Lubuntu since 18.10 with no such problems, so the issue must lie with something you installed or setup. Try booting a live Lubuntu system and see if you can get the same results. I'm sure you won't.

That doesn't mean this isn't an issue, but in order to resolve it, we would need to know which conditions are leading to the problem.

[q4a (q4a)]

I have same problem. Here is some system info:

q@i5:~$ uname -a
Linux i5 5.4.0-56-generic #62-Ubuntu SMP Mon Nov 23 19:20:19 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
q@i5:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.1 LTS"
q@i5:~$ apt-cache policy lxqt-policykit
lxqt-policykit:
  Установлен: 0.14.1-1ubuntu2
  Кандидат: 0.14.1-1ubuntu2
  Таблица версий:
 *** 0.14.1-1ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status

I'm getting error when trying to run synaptic from .desktop file or run `synaptic-pkexec`.
I'm getting popup window for password entry. I enter correct password and then I got error:

q@i5:~$ dmesg | grep policy
[ 3.472956] AppArmor: AppArmor sha1 policy hashing enabled
[ 147.848215] traps: lxqt-policykit-[1449] general protection fault ip:7fe59f4f9671 sp:7ffc2af52bf8 error:0 in libgobject-2.0.so.0.6400.3[7fe59f4cb000+36000]
[ 169.048264] traps: lxqt-policykit-[1668] general protection fault ip:7f0ad00a6671 sp:7fff02bcb2a8 error:0 in libgobject-2.0.so.0.6400.3[7f0ad0078000+36000]
q@i5:~$ synaptic-pkexec
Error executing command as another user: Not authorized

This incident has been reported.
q@i5:~$ dmesg | grep policy
[ 3.472956] AppArmor: AppArmor sha1 policy hashing enabled
[ 147.848215] traps: lxqt-policykit-[1449] general protection fault ip:7fe59f4f9671 sp:7ffc2af52bf8 error:0 in libgobject-2.0.so.0.6400.3[7fe59f4cb000+36000]
[ 169.048264] traps: lxqt-policykit-[1668] general protection fault ip:7f0ad00a6671 sp:7fff02bcb2a8 error:0 in libgobject-2.0.so.0.6400.3[7f0ad0078000+36000]
[ 598.506741] traps: lxqt-policykit-[1687] general protection fault ip:7f1023e0f671 sp:7ffdc0298888 error:0 in libgobject-2.0.so.0.6400.3[7f1023de1000+36000]

[q4a (q4a)]

Check this bug (may be related or duplicate) - https://bugs.launchpad.net/ubuntu/+source/lxqt-admin/+bug/1875774

[ԜаӀtеr Ⅼарсһуnѕkі (wxl)]

I'm pretty sure this is not a duplicate as no one else on the other bug mention the general protection fault you're seeing.

However, I'm also not sure this is a bug, either.

I installed synaptic (why not just use Muon? it's the same thing—an apt frontend—and comes with the install) and ran synaptic-pkexec and had no issues.

If /var/log/installer/casper-md5check.json exists, then you skipped the file check at the beginning of the installation process and that right there may indicate you have a corrupt installation, which could explain this strange behavior.

[ivanto (ivantu)]

Situation today at the problem

:~$ ls -la /var/log/installer
ls: unable to access '/ var / log / installer': File or directory does not exist

:~$ dmesg | grep policy
[ 1.160478] AppArmor: AppArmor sha1 policy hashing enabled

:~$ dpkg -l | grep policy
ii libkf5auth-data 5.68.0-0ubuntu1 all Abstraction to system policy and authentication features
ii libkf5auth5:amd64 5.68.0-0ubuntu1 amd64 Abstraction to system policy and authentication features
ii libkf5authcore5:amd64 5.68.0-0ubuntu1 amd64 Abstraction to system policy and authentication features
ii libnuma1:amd64 2.0.12-1 amd64 Libraries for controlling NUMA policy
ii libsemanage-common 3.0-1build2 all Common files for SELinux policy management libraries
ii libsemanage1:amd64 3.0-1build2 amd64 SELinux policy management library
ii libsepol1-dev:amd64 3.0-1 amd64 SELinux binary policy manipulation library and development files
ii lxqt-policykit 0.14.1-1ubuntu2 amd64 LXQt authentication agent for PolicyKit
ii lxqt-policykit-l10n 0.14.1-1ubuntu2 all Language package for lxqt-policykit
ii policykit-1 0.105-26ubuntu1 amd64 framework for managing administrative policies and privileges
ii policykit-1-gnome 0.105-7ubuntu2 amd64 authentication agent for PolicyKit
ii policykit-desktop-privileges 0.21 all run common desktop actions without password

[Launchpad Janitor (janitor)]

[Expired for lxqt-policykit (Ubuntu) because there has been no activity for 60 days.]