Application: kwin_x11 (5.5.5)

Qt Version: 5.5.1
Operating System: Linux 4.6.0-ck1 x86_64
Distribution: Ubuntu 16.04 LTS

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

I had a second session with differnt user running (with xfce) and switched back to the original kde5 session and unlocked it when it crashed. Presence of 4k monitor may be relevant.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fa75dccd940 (LWP 13464))]

Thread 5 (Thread 0x7fa73d244700 (LWP 13484)):
#0  0x00007fa75d7bad13 in select () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fa75bfbf10f in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) (nfds=15, fdread=fdread@entry=0x7fa730000a98, fdwrite=fdwrite@entry=0x7fa730000d28, fdexcept=fdexcept@entry=0x7fa730000fb8, orig_timeout=orig_timeout@entry=0x0) at kernel/qcore_unix.cpp:75
#2  0x00007fa75bfc0c0e in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) (timeout=0x0, exceptfds=0x7fa730000fb8, writefds=0x7fa730000d28, readfds=0x7fa730000a98, nfds=<optimized out>, this=0x7fa7300008e0) at kernel/qeventdispatcher_unix.cpp:320
#3  0x00007fa75bfc0c0e in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) (this=this@entry=0x7fa730000900, flags=..., flags@entry=..., timeout=timeout@entry=0x0) at kernel/qeventdispatcher_unix.cpp:196
#4  0x00007fa75bfc113e in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fa7300008e0, flags=...) at kernel/qeventdispatcher_unix.cpp:607
#5  0x00007fa75bf6adea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fa73d243c60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fa75bd878a4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007fa75689d3c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fa75bd8c84e in QThreadPrivate::start(void*) (arg=0x1e8b950) at thread/qthread_unix.cpp:331
#9  0x00007fa7577406fa in start_thread (arg=0x7fa73d244700) at pthread_create.c:333
#10 0x00007fa75d7c4b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fa737303700 (LWP 13504)):
#0  0x00007fa7577463a0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fa75af14bd4 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007fa75af14c19 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007fa7577406fa in start_thread (arg=0x7fa737303700) at pthread_create.c:333
#4  0x00007fa75d7c4b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fa737b0c700 (LWP 22005)):
#0  0x00007fa75d7bad13 in select () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fa75bfbf10f in qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*) (nfds=14, fdread=fdread@entry=0x7fa72c000a78, fdwrite=fdwrite@entry=0x7fa72c000d08, fdexcept=fdexcept@entry=0x7fa72c000f98, orig_timeout=orig_timeout@entry=0x0) at kernel/qcore_unix.cpp:75
#2  0x00007fa75bfc0c0e in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) (timeout=0x0, exceptfds=0x7fa72c000f98, writefds=0x7fa72c000d08, readfds=0x7fa72c000a78, nfds=<optimized out>, this=0x7fa72c0008c0) at kernel/qeventdispatcher_unix.cpp:320
#3  0x00007fa75bfc0c0e in QEventDispatcherUNIXPrivate::doSelect(QFlags<QEventLoop::ProcessEventsFlag>, timespec*) (this=this@entry=0x7fa72c0008e0, flags=..., flags@entry=..., timeout=timeout@entry=0x0) at kernel/qeventdispatcher_unix.cpp:196
#4  0x00007fa75bfc113e in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fa72c0008c0, flags=...) at kernel/qeventdispatcher_unix.cpp:607
#5  0x00007fa75bf6adea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fa737b0bc60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fa75bd878a4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007fa75689d3c5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fa75bd8c84e in QThreadPrivate::start(void*) (arg=0x308cb30) at thread/qthread_unix.cpp:331
#9  0x00007fa7577406fa in start_thread (arg=0x7fa737b0c700) at pthread_create.c:333
#10 0x00007fa75d7c4b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fa73dd12700 (LWP 22006)):
#0  0x00007fa7577463a0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fa75bd8daeb in QWaitCondition::wait(QMutex*, unsigned long) (time=18446744073709551615, this=0x2fcbd40) at thread/qwaitcondition_unix.cpp:136
#2  0x00007fa75bd8daeb in QWaitCondition::wait(QMutex*, unsigned long) (this=<optimized out>, mutex=0x33dbfa0, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:208
#3  0x00007fa756d8492e in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#4  0x00007fa756d851b3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#5  0x00007fa75bd8c84e in QThreadPrivate::start(void*) (arg=0x33dbf20) at thread/qthread_unix.cpp:331
#6  0x00007fa7577406fa in start_thread (arg=0x7fa73dd12700) at pthread_create.c:333
#7  0x00007fa75d7c4b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fa75dccd940 (LWP 13464)):
[KCrash Handler]
#6  0x00007fa75d75ce19 in __memcpy_sse2_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S:37
#7  0x00007fa7572ec356 in KWin::GLVertexBuffer::setData(int, int, float const*, float const*) () at /usr/lib/x86_64-linux-gnu/libkwinglutils.so.7
#8  0x00007fa75d3711bd in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#9  0x00007fa75d375915 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#10 0x00007fa75d35f0d5 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#11 0x00007fa75d370993 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#12 0x00007fa75d359e64 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#13 0x00007fa75d38715f in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#14 0x00007fa75b522a6f in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.7
#15 0x00007fa75d38710a in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#16 0x00007fa75b522a6f in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.7
#17 0x00007fa75d38710a in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#18 0x00007fa75b522a6f in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.7
#19 0x00007fa75d38710a in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#20 0x00007fa75b522a6f in KWin::Effect::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwineffects.so.7
#21 0x00007fa75d38710a in KWin::EffectsHandlerImpl::paintScreen(int, QRegion, KWin::ScreenPaintData&) () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#22 0x00007fa75d359ada in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#23 0x00007fa75d3763c0 in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#24 0x00007fa75d3517f9 in KWin::Compositor::performCompositing() () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#25 0x00007fa75bf9ce53 in QObject::event(QEvent*) (this=0x1e1e7a0, e=<optimized out>) at kernel/qobject.cpp:1261
#26 0x00007fa75c86005c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x1cc5b70, receiver=receiver@entry=0x1e1e7a0, e=e@entry=0x7ffe54b05350) at kernel/qapplication.cpp:3716
#27 0x00007fa75c865516 in QApplication::notify(QObject*, QEvent*) (this=0x7ffe54b05580, receiver=0x1e1e7a0, e=0x7ffe54b05350) at kernel/qapplication.cpp:3499
#28 0x00007fa75bf6d62b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7ffe54b05580, receiver=0x1e1e7a0, event=event@entry=0x7ffe54b05350) at kernel/qcoreapplication.cpp:965
#29 0x00007fa75bfc289d in QTimerInfoList::activateTimers() (event=0x7ffe54b05350, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#30 0x00007fa75bfc289d in QTimerInfoList::activateTimers() (this=0x1d21528) at kernel/qtimerinfo_unix.cpp:637
#31 0x00007fa75bfc0640 in QEventDispatcherUNIX::activateTimers() (this=this@entry=0x1d27560) at kernel/qeventdispatcher_unix.cpp:549
#32 0x00007fa75bfc10b6 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x1d27560, flags=flags@entry=...) at kernel/qeventdispatcher_unix.cpp:611
#33 0x00007fa745e1a38d in QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at eventdispatchers/qunixeventdispatcher.cpp:62
#34 0x00007fa75bf6adea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffe54b054a0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#35 0x00007fa75bf72e8c in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1229
#36 0x00007fa75da8c504 in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#37 0x00007fa75d6de830 in __libc_start_main (main=0x400780 <main>, argc=3, argv=0x7ffe54b056e8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe54b056d8) at ../csu/libc-start.c:291
#38 0x00000000004007b9 in _start ()

Reported using DrKonqi