systemd-logind crashed with assertion failure in bus_manager_create_session()

[rehan]

i dont know what bug it is..

ProblemType: Crash
DistroRelease: Ubuntu 14.10
Package: systemd 208-8ubuntu1 [modified: usr/share/dbus-1/system-services/org.freedesktop.systemd1.service]
ProcVersionSignature: Ubuntu 3.16.0-10.15-generic 3.16.1
Uname: Linux 3.16.0-10-generic i686
ApportVersion: 2.14.6-0ubuntu2
Architecture: i386
Date: Fri Aug 29 09:39:58 2014
ExecutablePath: /lib/systemd/systemd-logind
InstallationDate: Installed on 2013-09-27 (335 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcCmdline: /lib/systemd/systemd-logind
ProcEnviron:

Signal: 6
SourcePackage: systemd
StacktraceTop:
 ?? ()
 ?? ()
 ?? ()
 ?? ()
 ?? () from /lib/i386-linux-gnu/libdbus-1.so.3
Title: systemd-logind crashed with SIGABRT
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Apport retracing service (apport)]

StacktraceTop:
 log_assert (text=text@entry=0x807706f "s->user->slice", file=file@entry=0x8076ed3 "../src/login/logind-session.c", line=531, func=0x8077763 <__PRETTY_FUNCTION__.9639> "session_start_scope", format=0x807b7e0 "Assertion '%s' failed at %s:%u, function %s(). Aborting.") at ../src/shared/log.c:702
 log_assert_failed (text=0x807706f "s->user->slice", file=0x8076ed3 "../src/login/logind-session.c", line=531, func=0x8077763 <__PRETTY_FUNCTION__.9639> "session_start_scope") at ../src/shared/log.c:707
 session_start_scope (s=<optimized out>) at ../src/login/logind-session.c:531
 session_start (s=0x95c2710) at ../src/login/logind-session.c:585
 bus_manager_create_session (message=<optimized out>, m=<optimized out>) at ../src/login/logind-dbus.c:642

[Launchpad Janitor (janitor)]

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