lxlock terminates/crashes the session instead of screenlocking

[Hadmut Danisch]

Hi,

I noticed that when I use Control-Alt-L in order to lock the screen, I get a fresh login prompt and fresh session, the old session is terminated and lost.

~/.config/openbox/lubuntu-rc.xml shows that

lxsession-default lock

will be executed, thus calling lxlock, since this is set as the default application.

It does, however, not start a screen lock, but kill the session for whatever reason.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lxsession 0.5.2-0ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: LXDE
Date: Mon May 9 12:08:26 2016
InstallationDate: Installed on 2016-04-22 (16 days ago)
InstallationMedia: Lubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420)
SourcePackage: lxsession
UpgradeStatus: No upgrade log present (probably fresh install)

[Hadmut Danisch (hadmut)]

Sorry, I just noticed that I've reported against the wrong package. lxlock just calls

light-locker-command -l

which causes the problem.

[Hadmut Danisch (hadmut)]

I've noticed that lxlock is just a script that calls light-locker-command, so it was wrong to report against lxsession.

[Hadmut Danisch (hadmut)]

strace revealed how light-locker dies:

16329 write(2, "\n(light-locker:16329): Gdk-WARNING **: light-locker: Fatal IO error 11 (Die Ressource ist zur Zeit nicht verf\303\274gbar) on X server :1.\n\n", 134) = 134
16329 exit_group(1) = ?

There's more error messages like that in the logs:

lxsession-default-apps: Fatal IO error 11 (Die Ressource ist zur Zeit nicht verfügbar) on X server :0.0.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Anton Melser (melser-anton)]

Hi,

I just wanted to report that the session crashes I was experiencing appear to have been transitory, and I am no longer able to reproduce. If it returns I will attempt to gather some further low-level info - I didn't confirm with strace or anything but all of the system characteristics described above apply to mine also.
Thanks,
Anton

[Theo Linkspfeifer (lastonestanding)]

Does "dm-tool switch-to-greeter" trigger the crash also?

[Launchpad Janitor (janitor)]

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

[Launchpad Janitor (janitor)]

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