Bug 362543

Application: plasmashell (5.5.5)

Qt Version: 5.5.1
Operating System: Linux 4.5.0-ck1 x86_64
Distribution: Ubuntu 16.04 LTS

-- Information about the crash:
- What I was doing when the application crashed:

After having a second user login session open, I switched back to the first user for a prolonged period. Long after the screen locker would have invoked on the second session I tried switching back to it by which time it had crashed. This has happened on a few occasions and it has advised me to use loginctl to recover access to the session which succeeds and provides me with the kde crash reporting assistant.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
[Current thread is 1 (Thread 0x7f27194ce900 (LWP 20929))]

Thread 8 (Thread 0x7f2703e5e700 (LWP 20965)):
#0  0x00007f2713bdce8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f2717ca1c62 in poll (__timeout=-1, __nfds=1, __fds=0x7f2703e5dbc0) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  _xcb_conn_wait (c=c@entry=0x2701730, cond=cond@entry=0x2701770, vector=vector@entry=0x0, count=count@entry=0x0) at ../../src/xcb_conn.c:459
#3  0x00007f2717ca38d7 in xcb_wait_for_event (c=0x2701730) at ../../src/xcb_in.c:693
#4  0x00007f27065de629 in QXcbEventReader::run (this=0x270f890) at qxcbconnection.cpp:1253
#5  0x00007f27142d284e in QThreadPrivate::start (arg=0x270f890) at thread/qthread_unix.cpp:331
#6  0x00007f27133bf6fa in start_thread (arg=0x7f2703e5e700) at pthread_create.c:333
#7  0x00007f2713be8b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f2700e00700 (LWP 21026)):
#0  0x00007f2713bdce8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f271097231c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f271097242c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2714509a9b in QEventDispatcherGlib::processEvents (this=0x7f26f40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f27144b0dea in QEventLoop::exec (this=this@entry=0x7f2700dffca0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f27142cd8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f2716b753c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f27142d284e in QThreadPrivate::start (arg=0x2806c90) at thread/qthread_unix.cpp:331
#8  0x00007f27133bf6fa in start_thread (arg=0x7f2700e00700) at pthread_create.c:333
#9  0x00007f2713be8b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f26f2436700 (LWP 21060)):
#0  0x00007f2713bdce8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f271097231c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f271097242c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2714509a9b in QEventDispatcherGlib::processEvents (this=0x7f26ec0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f27144b0dea in QEventLoop::exec (this=this@entry=0x7f26f2435ca0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f27142cd8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f2716b753c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f27142d284e in QThreadPrivate::start (arg=0x2949ff0) at thread/qthread_unix.cpp:331
#8  0x00007f27133bf6fa in start_thread (arg=0x7f26f2436700) at pthread_create.c:333
#9  0x00007f2713be8b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f26ebfff700 (LWP 21061)):
#0  0x00007f27109b6a64 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f27109718a0 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f271097224b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f271097242c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f2714509a9b in QEventDispatcherGlib::processEvents (this=0x7f26e40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f27144b0dea in QEventLoop::exec (this=this@entry=0x7f26ebffeca0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f27142cd8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f2716b753c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f27142d284e in QThreadPrivate::start (arg=0x2cbc980) at thread/qthread_unix.cpp:331
#9  0x00007f27133bf6fa in start_thread (arg=0x7f26ebfff700) at pthread_create.c:333
#10 0x00007f2713be8b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f26ea9cf700 (LWP 21062)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f2718f1abd4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f2718f1ac19 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f27133bf6fa in start_thread (arg=0x7f26ea9cf700) at pthread_create.c:333
#4  0x00007f2713be8b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f2663fff700 (LWP 21063)):
#0  0x00007f2713bdce8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f271097231c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f271097242c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2714509a9b in QEventDispatcherGlib::processEvents (this=0x7f265c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f27144b0dea in QEventLoop::exec (this=this@entry=0x7f2663ffec50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f27142cd8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f27174fbed6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f27142d284e in QThreadPrivate::start (arg=0x2f8a5b0) at thread/qthread_unix.cpp:331
#8  0x00007f27133bf6fa in start_thread (arg=0x7f2663fff700) at pthread_create.c:333
#9  0x00007f2713be8b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f2663629700 (LWP 21064)):
[KCrash Handler]
#6  __strstr_sse2_unaligned () at ../sysdeps/x86_64/multiarch/strstr-sse2-unaligned.S:40
#7  0x00007f271754eaca in QSGRenderContext::initialize(QOpenGLContext*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f2717572409 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007f27142d284e in QThreadPrivate::start (arg=0x2f0e350) at thread/qthread_unix.cpp:331
#10 0x00007f27133bf6fa in start_thread (arg=0x7f2663629700) at pthread_create.c:333
#11 0x00007f2713be8b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f27194ce900 (LWP 20929)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f27142d3aeb in QWaitConditionPrivate::wait (time=18446744073709551615, this=0x2f0c2d0) at thread/qwaitcondition_unix.cpp:136
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x2f0e390, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007f271756ebc6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007f271757109c in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007f2717571733 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#6  0x00007f27147fe2e5 in QWindow::event (this=0x2ed2c00, ev=<optimized out>) at kernel/qwindow.cpp:2060
#7  0x00007f27175a4871 in QQuickWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x000000000043f206 in DesktopView::event (this=0x2ed2c00, e=0x7ffd3a35c610) at /build/plasma-workspace-kxRFE_/plasma-workspace-5.5.5.2/shell/desktopview.cpp:205
#9  0x00007f2714fb605c in QApplicationPrivate::notify_helper (this=this@entry=0x26db460, receiver=receiver@entry=0x2ed2c00, e=e@entry=0x7ffd3a35c610) at kernel/qapplication.cpp:3716
#10 0x00007f2714fbb516 in QApplication::notify (this=0x7ffd3a35ca30, receiver=0x2ed2c00, e=0x7ffd3a35c610) at kernel/qapplication.cpp:3499
#11 0x00007f27144b362b in QCoreApplication::notifyInternal (this=0x7ffd3a35ca30, receiver=receiver@entry=0x2ed2c00, event=event@entry=0x7ffd3a35c610) at kernel/qcoreapplication.cpp:965
#12 0x00007f27147f64ec in QCoreApplication::sendSpontaneousEvent (event=0x7ffd3a35c610, receiver=0x2ed2c00) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#13 QGuiApplicationPrivate::processExposeEvent (e=0x2ea1c30) at kernel/qguiapplication.cpp:2663
#14 0x00007f27147f725d in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x2ea1c30) at kernel/qguiapplication.cpp:1658
#15 0x00007f27147daf38 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:625
#16 0x00007f270660ff10 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#17 0x00007f2710972127 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007f2710972380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007f271097242c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007f2714509a7f in QEventDispatcherGlib::processEvents (this=0x27331c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#21 0x00007f27144b0dea in QEventLoop::exec (this=this@entry=0x7ffd3a35c8d0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#22 0x00007f27144b8e8c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#23 0x00007f27147ecc3c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1542
#24 0x00007f2714fb2495 in QApplication::exec () at kernel/qapplication.cpp:2976
#25 0x0000000000432d4a in main (argc=4, argv=<optimized out>) at /build/plasma-workspace-kxRFE_/plasma-workspace-5.5.5.2/shell/main.cpp:181

Possible duplicates by query: bug 361553, bug 361302, bug 358964, bug 358883, bug 358297.

Reported using DrKonqi