Software: 2/10/18 Bionic Kubuntu image
Hardware: 2013 HP ENVY dv6, 500GB 5400 RPM WD hard drive, 8 GB RAM, crappy NVIDIA GPU; 15.4" 720p TN screen (very low quality)
While in the live session, trying to turn off the machine (Menu > Leave > Shut down) reproducibly crashes ksmserver-logout-greeter with the following backtrace:
Application: ksmserver-logout-greeter (ksmserver-logout-greeter), signal: Aborted Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". [Current thread is 1 (Thread 0x7fd3828b2940 (LWP 24908))] Thread 3 (Thread 0x7fd3637fe700 (LWP 24911)): #0 0x00007fd37e14f901 in __GI___poll (fds=0x7fd354004a60, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007fd376f23169 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #2 0x00007fd376f2327c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #3 0x00007fd37ea9037b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #4 0x00007fd37ea3551a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #5 0x00007fd37e85426a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #6 0x00007fd380ab2065 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #7 0x00007fd37e8591ad in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #8 0x00007fd378cf27fc in start_thread (arg=0x7fd3637fe700) at pthread_create.c:465 #9 0x00007fd37e15bb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 2 (Thread 0x7fd363fff700 (LWP 24910)): #0 0x00007fd37e14f901 in __GI___poll (fds=0x7fd35c01b7c0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007fd376f23169 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #2 0x00007fd376f2327c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #3 0x00007fd37ea9037b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #4 0x00007fd37ea3551a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #5 0x00007fd37e85426a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #6 0x00007fd37f673d45 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5 #7 0x00007fd37e8591ad in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #8 0x00007fd378cf27fc in start_thread (arg=0x7fd363fff700) at pthread_create.c:465 #9 0x00007fd37e15bb0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 1 (Thread 0x7fd3828b2940 (LWP 24908)): [KCrash Handler] #6 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51 #7 0x00007fd37e07ff5d in __GI_abort () at abort.c:90 #8 0x00007fd37e843fe7 in QMessageLogger::fatal(char const*, ...) const () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #9 0x00007fd381182b47 in QSGRenderLoop::handleContextCreationFailure(QQuickWindow*, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5 #10 0x00007fd381183b15 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5 #11 0x00007fd38118473a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5 #12 0x00007fd37f002fb5 in QWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 #13 0x00007fd3811f81b5 in QQuickWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5 #14 0x000056433a4de011 in ?? () #15 0x00007fd37fc405bc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 #16 0x00007fd37fc47e84 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 #17 0x00007fd37ea374c8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #18 0x00007fd37eff809f in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 #19 0x00007fd37eff8cdd in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 #20 0x00007fd37efd0cab in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 #21 0x00007fd36cdd1f50 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5 #22 0x00007fd376f22fb7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #23 0x00007fd376f231f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #24 0x00007fd376f2327c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 #25 0x00007fd37ea9035f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #26 0x00007fd37ea3551a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #27 0x00007fd37ea3e484 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #28 0x000056433a4db062 in ?? () #29 0x00007fd37e0681c1 in __libc_start_main (main=0x56433a4dacf0, argc=6, argv=0x7ffc7a9a1a88, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc7a9a1a78) at ../csu/libc-start.c:308 #30 0x000056433a4db1aa in _start ()