Bug 343543

*** Bug 343471 has been marked as a duplicate of this bug. ***

*** Bug 343551 has been marked as a duplicate of this bug. ***

*** Bug 344151 has been marked as a duplicate of this bug. ***

Sounds like a Qt bug to me...

*** Bug 345233 has been marked as a duplicate of this bug. ***

Backtrace from a debug build of qt in plasma 5.3:

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7b51b81 in QQuickItemPrivate::addToDirtyList (this=0xc60c20) at items/qquickitem.cpp:5634
5634            if (nextDirtyItem) QQuickItemPrivate::get(nextDirtyItem)->prevDirtyItem = &nextDirtyItem;
(gdb) bt
#0  0x00007ffff7b51b81 in QQuickItemPrivate::addToDirtyList (this=0xc60c20) at items/qquickitem.cpp:5634
#1  0x00007ffff7b51c78 in QQuickItemPrivate::dirty (this=0xc60c20, type=<optimized out>) at items/qquickitem.cpp:5618
#2  0x00007ffff7b524f5 in QQuickItem::update (this=0xc60ba0) at items/qquickitem.cpp:4097
#3  0x00007ffff7b5cd05 in QQuickItem::qt_static_metacall (_o=0x9d43a0, _c=12979104, _id=9041968, _a=0x7fffc806a890)
    at .moc/moc_qquickitem.cpp:595
#4  0x00007ffff49ae12a in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#5  0x00007ffff7b5b7cb in QQuickItem::event (this=0xc60ba0, ev=0x7fffc806d5e0) at items/qquickitem.cpp:7305
#6  0x00007ffff5e25acc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#7  0x00007ffff5e2af10 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#8  0x00007ffff497cdbb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#9  0x00007ffff497edfb in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) ()
   from /usr/lib/libQt5Core.so.5
#10 0x00007ffff49d4dc3 in ?? () from /usr/lib/libQt5Core.so.5
#11 0x00007ffff11e89fd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#12 0x00007ffff11e8ce0 in ?? () from /usr/lib/libglib-2.0.so.0
#13 0x00007ffff11e8d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#14 0x00007ffff49d51b7 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt5Core.so.5
#15 0x00007ffff497a852 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#16 0x00007ffff498222c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#17 0x000000000040ee1b in main ()
(gdb) info threads
  Id   Target Id         Frame
  4    Thread 0x7fffe4bd0700 (LWP 2070) "QXcbEventReader" 0x00007ffff411b4ed in poll () from /usr/lib/libc.so.6
  3    Thread 0x7fffda035700 (LWP 2071) "QProcessManager" 0x00007ffff411d1b3 in select () from /usr/lib/libc.so.6
* 1    Thread 0x7ffff7e027c0 (LWP 2066) "systemsettings5" 0x00007ffff7b51b81 in QQuickItemPrivate::addToDirtyList (
    this=0xc60c20) at items/qquickitem.cpp:5634

and indeed the dirtyItemList within the window is corrupt somehow:

(gdb) p nextDirtyItem
$1 = (QQuickItem *) 0x7661020073
(gdb) p *nextDirtyItem
Cannot access memory at address 0x7661020073

Presumably since it happens on exit something is racing with window deletion?

Comment #6 is bug 344651.

*** Bug 346734 has been marked as a duplicate of this bug. ***

*** Bug 346719 has been marked as a duplicate of this bug. ***

*** Bug 346697 has been marked as a duplicate of this bug. ***

*** Bug 346643 has been marked as a duplicate of this bug. ***

*** Bug 346628 has been marked as a duplicate of this bug. ***

*** Bug 345841 has been marked as a duplicate of this bug. ***

I can confirm this bug. When I change my display settings (e.g. turn on external screen or switch back to notebook screen) it takes quite some time until every component (e.g. the taskbar) is visible again and scaled correctly.

Sometimes it works, sometimes the desktop environment hangs and I can't switch windows any more and I need to log off and log on again.

There is also a crash reported sometimes (the bug symbol shows up in the notification area) but nothing shows up when I click on it.

My notebook has an Intel Graphics card.

*** Bug 347699 has been marked as a duplicate of this bug. ***

*** Bug 347730 has been marked as a duplicate of this bug. ***

I can confirm this on Plasma 5.3.1 (Kubuntu packages). Here is the backtrace from  gdb:

(gdb) r
Starting program: /usr/bin/systemsettings5 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
kf5.kiconthemes: "Theme tree: (Breeze)"
kf5.kservice.sycoca: Trying to open ksycoca from "/home/soee/.cache/ksycoca5"
LOAD
kscreen: launcherDataAvailable: "org.kde.KScreen.Backend.XRandR"
kscreen: Primary output changed from KScreen::Output(Id: 67 , Name: "LVDS1" ) ( "LVDS1" ) to KScreen::Output(Id: 67 , Name: "LVDS1" ) ( "LVDS1" )
kscreen: Launcher finished with exit code 1 , status 0
kscreen: Service for requested backend already running
kscreen: Primary output changed from KScreen::Output(Id: 67 , Name: "LVDS1" ) ( "LVDS1" ) to KScreen::Output(Id: 67 , Name: "LVDS1" ) ( "LVDS1" )
[New Thread 0x7fffd646d700 (LWP 10608)]
Activate output 67
[Thread 0x7fffd646d700 (LWP 10608) exited]
[New Thread 0x7fffd7085700 (LWP 10605)]
[New Thread 0x7fffe5522700 (LWP 10604)]

Program received signal SIGSEGV, Segmentation fault.                                                                                                                                   
0x00007ffff36a8de0 in QQuickWindow::maybeUpdate() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5                                                                                   
(gdb) bt                                                                                                                                                                               
#0  0x00007ffff36a8de0 in QQuickWindow::maybeUpdate() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5                                                                               
#1  0x00007ffff3694e28 in QQuickItemPrivate::dirty(QQuickItemPrivate::DirtyType) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5                                                    
#2  0x00007ffff369f045 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5                                                                                                        
#3  0x00007ffff4e7c73a in QObject::event (this=0xde4990, e=<optimized out>) at kernel/qobject.cpp:1245                                                                                 
#4  0x00007ffff369db6b in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5                                                                                
#5  0x00007ffff5c36b2c in QApplicationPrivate::notify_helper (this=0x66df40, receiver=0xde4990, e=0x7fffc4156ba0) at kernel/qapplication.cpp:3720
#6  0x00007ffff5c3c000 in QApplication::notify (this=0x7fffffffdd00, receiver=0xde4990, e=0x7fffc4156ba0) at kernel/qapplication.cpp:3503
#7  0x00007ffff4e4ac2b in QCoreApplication::notifyInternal (this=0x7fffffffdd00, receiver=0xde4990, event=event@entry=0x7fffc4156ba0) at kernel/qcoreapplication.cpp:935
#8  0x00007ffff4e4cc9b in sendEvent (event=0x7fffc4156ba0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#9  QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x66d190) at kernel/qcoreapplication.cpp:1552
#10 0x00007ffff4e4d298 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#11 0x00007ffff4ea3843 in postEventSourceDispatch (s=0x6a6ab0) at kernel/qeventdispatcher_glib.cpp:271
#12 0x00007ffff12a0c3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007ffff12a0f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007ffff12a0fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007ffff4ea3c57 in QEventDispatcherGlib::processEvents (this=0x6c2460, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#16 0x00007ffff4e483e2 in QEventLoop::exec (this=this@entry=0x7fffffffdbe0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#17 0x00007ffff4e5002c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#18 0x000000000040ef6b in main ()
(gdb)

I would also add that it hangs/crashes when i just enter and exit Display & Monitor section.

*** Bug 348517 has been marked as a duplicate of this bug. ***

Also happening even with Qt 5.4.2

 0x00007f904621cdf0 in QQuickWindow::maybeUpdate() () from /usr/lib/libQt5Quick.so.5
 0x00007f9046209763 in QQuickItemPrivate::dirty(QQuickItemPrivate::DirtyType) () from /usr/lib/libQt5Quick.so.5
 0x00007f9046214045 in ?? () from /usr/lib/libQt5Quick.so.5
 0x00007f90479e8ae1 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
 0x00007f904621381b in QQuickItem::event(QEvent*) () from /usr/lib/libQt5Quick.so.5
 0x00007f90494ca62c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
 0x00007f90494cfd10 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
 0x00007f90479b757b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
 0x00007f90479b96b7 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt5Core.so.5
 0x00007f9047a0e8f3 in ?? () from /usr/lib/libQt5Core.so.5
 0x00007f90430d19fd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
 0x00007f90430d1ce0 in ?? () from /usr/lib/libglib-2.0.so.0
 0x00007f90430d1d8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
 0x00007f9047a0ecff in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
 0x00007f90479b4ffa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
 0x00007f90479bca4c in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
 0x000000000040eebb in main (argc=1, argv=<optimized out>) at /mnt/AUR/systemsettings-git/src/systemsettings/app/main.cpp:55

*** Bug 350015 has been marked as a duplicate of this bug. ***

I recompiled everything from git and it happens even with latest Qt 5.5 from git.

Here's a backtrace from debug build

#0  QQuickWindow::maybeUpdate (this=0x801)
    at /mnt/AUR/qt5-declarative-git/src/qt5-declarative/src/quick/items/qquickwindow.cpp:3039
#1  0x00007ffff2e5e039 in QQuickWindowPrivate::dirtyItem (this=<optimized out>)
    at /mnt/AUR/qt5-declarative-git/src/qt5-declarative/src/quick/items/qquickwindow.cpp:939
#2  0x00007ffff2e48d85 in QQuickItemPrivate::addToDirtyList (this=0xdbd700)
    at /mnt/AUR/qt5-declarative-git/src/qt5-declarative/src/quick/items/qquickitem.cpp:5613
#3  0x00007ffff2e48e43 in QQuickItemPrivate::dirty (this=0xdbd700, type=<optimized out>)
    at /mnt/AUR/qt5-declarative-git/src/qt5-declarative/src/quick/items/qquickitem.cpp:5594
#4  0x00007ffff2e496cd in QQuickItem::update (this=0xdbd680)
    at /mnt/AUR/qt5-declarative-git/src/qt5-declarative/src/quick/items/qquickitem.cpp:4088
#5  0x00007ffff2e56c0d in QQuickItem::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>,
    _a=<optimized out>) at .moc/moc_qquickitem.cpp:597
#6  0x00007ffff45f2ae1 in QObject::event (this=this@entry=0xdbd680, e=e@entry=0x7fffc411f5c0) at kernel/qobject.cpp:1239
#7  0x00007ffff2e53a63 in QQuickItem::event (this=0xdbd680, ev=0x7fffc411f5c0)
    at /mnt/AUR/qt5-declarative-git/src/qt5-declarative/src/quick/items/qquickitem.cpp:7294
#8  0x00007ffff6087d94 in QApplicationPrivate::notify_helper (this=this@entry=0x681dd0, receiver=receiver@entry=0xdbd680,
    e=e@entry=0x7fffc411f5c0) at kernel/qapplication.cpp:3717
#9  0x00007ffff608d2c8 in QApplication::notify (this=0x7fffffffe490, receiver=0xdbd680, e=0x7fffc411f5c0)
    at kernel/qapplication.cpp:3500
#10 0x00007ffff45c49dc in QCoreApplication::notifyInternal (this=0x7fffffffe490, receiver=0xdbd680,
    event=event@entry=0x7fffc411f5c0) at kernel/qcoreapplication.cpp:965
#11 0x00007ffff45c7dea in sendEvent (event=0x7fffc411f5c0, receiver=<optimized out>)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#12 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x681430)
    at kernel/qcoreapplication.cpp:1593
#13 0x00007ffff45c8230 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0)
    at kernel/qcoreapplication.cpp:1451
#14 0x00007ffff4617f63 in postEventSourceDispatch (s=0x6d7a90) at kernel/qeventdispatcher_glib.cpp:271
#15 0x00007fffefcce9fd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#16 0x00007fffefccece0 in ?? () from /usr/lib/libglib-2.0.so.0
#17 0x00007fffefcced8c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#18 0x00007ffff4617fd7 in QEventDispatcherGlib::processEvents (this=0x6dff50, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#19 0x00007ffff45c339a in QEventLoop::exec (this=this@entry=0x7fffffffe370, flags=..., flags@entry=...)
    at kernel/qeventloop.cpp:204
#20 0x00007ffff45cb23c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#21 0x00007ffff592cbf4 in QGuiApplication::exec () at kernel/qguiapplication.cpp:1528
#22 0x00007ffff6084bb5 in QApplication::exec () at kernel/qapplication.cpp:2977
#23 0x000000000040f52b in main (argc=1, argv=<optimized out>)
    at /mnt/AUR/systemsettings-git/src/systemsettings/app/main.cpp:55


Dump of assembler code for function QQuickItemPrivate::addToDirtyList()
[...]
5608            QQuickWindowPrivate *p = QQuickWindowPrivate::get(window);
5609            nextDirtyItem = p->dirtyItemList;
   0x00007ffff2e48d46 <+54>:    mov    rax,QWORD PTR [rdi+0x1a8]
   0x00007ffff2e48d4d <+61>:    mov    QWORD PTR [rbx+0xa8],rax
5610            if (nextDirtyItem) QQuickItemPrivate::get(nextDirtyItem)->prevDirtyItem = &nextDirtyItem;
   0x00007ffff2e48d54 <+68>:    test   rax,rax
   0x00007ffff2e48d57 <+71>:    je     0x7ffff2e48d6b <QQuickItemPrivate::addToDirtyList()+91>
   0x00007ffff2e48d59 <+73>:    mov    rax,QWORD PTR [rax+0x8]
   0x00007ffff2e48d5d <+77>:    lea    rdx,[rbx+0xa8]
   0x00007ffff2e48d64 <+84>:    mov    QWORD PTR [rax+0xb0],rdx
5611            prevDirtyItem = &p->dirtyItemList;
   0x00007ffff2e48d6b <+91>:    lea    rax,[rdi+0x1a8]
   0x00007ffff2e48d72 <+98>:    mov    QWORD PTR [rbx+0xb0],rax
5612            p->dirtyItemList = q;
   0x00007ffff2e48d79 <+105>:   mov    QWORD PTR [rdi+0x1a8],rsi
5613            p->dirtyItem(q);
=>   0x00007ffff2e48d80 <+112>:   call   0x7ffff2e5e030 <QQuickWindowPrivate::dirtyItem(QQuickItem*)>

Dump of assembler code for function QQuickWindowPrivate::dirtyItem(QQuickItem*):
937     {
938         Q_Q(QQuickWindow);
939         q->maybeUpdate();
   0x00007ffff2e5e030 <+0>:     mov    rdi,QWORD PTR [rdi+0x8]
=>   0x00007ffff2e5e034 <+4>:     jmp    0x7ffff2e5dfe8 <QQuickWindow::maybeUpdate()>

Dump of assembler code for function QQuickWindow::maybeUpdate():
135             return d;
=> 0x00007ffff2e5dfe8 <+0>:     mov    rdx,QWORD PTR [rdi+0x8]
(gdb) p this
$4 = (QQuickWindow * const) 0x801
(gdb) p *this
Cannot access memory at address 0x801

I'm pretty sure this is caused by same memory corruption as in bug 344651
Something trashes QWindow


Have anyone reported it to Qt? It is always reproducible.

Yes I just had this happen to me. I was using two monitors, one broke, I unplugged it. Suddenly, I could no longer log in to KDE5. I tried deleting tons of stuff, ~/.config/plasma*, ~/.config/kde* , but eventually I determined that an extra file in ~/.local/share/kscreen/ was the problem. It looks to me like this lists monitors that you have and that are plugged in. I did `rm -r ~/.local/share/kscreen` and the problem went away, KDE started!

*** Bug 350102 has been marked as a duplicate of this bug. ***

*** Bug 350197 has been marked as a duplicate of this bug. ***

*** Bug 350681 has been marked as a duplicate of this bug. ***

This is still marked unconfirmed?:( I see a ton of bug reports going back months, systemsettings5 crashes all over the place this is one of them that has been ongoing over few releases - when going to Display & Monitor and even immediately hitting "Back" it segfaults:

Reading symbols from /usr/bin/systemsettings5...done.
[New LWP 5171]
[New LWP 5172]

warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `systemsettings5'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fd1c8b5f012 in QQuickItemPrivate::addToDirtyList() () from /usr/lib/libQt5Quick.so.5

Running arch linux x64 all the latest builds and QT5, systemsettings 5.3.2-1, qt 5.5.0-1, plasma-desktop 5.3.2-2, plasma-framework 5.12.0-1, plasma-workspace 5.3.2-2
Not sure if it matters but have multiple monitors and nvidia 352.21-4

Can provide debugging trace on above when QT finishes recompiling with debugging symbols if needed as well, also realize may be upstream based on comments but may want to change status to confirmed or upstream? Or does it just stay unconf until upstream resolves assuming that's the issue? Thanks guys!

*** Bug 351093 has been marked as a duplicate of this bug. ***

Still in Plasma 5.4.

Application: systemsettings5 (5.4.0)

Qt Version: 5.4.2
Operating System: Linux 4.1.0-3-generic x86_64
Distribution: Ubuntu Wily Werewolf (development branch)

The crash can be reproduced every time.

-- Backtrace:
Application: Ustawienia systemowe (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f106b8d4800 (LWP 28274))]

Thread 2 (Thread 0x7f1059707700 (LWP 28275)):
#0  0x00007f106809a8dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1065da6bd2 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f1065da874f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f105c4c89e9 in QXcbEventReader::run (this=0x1058980) at qxcbconnection.cpp:1105
#4  0x00007f106878c25e in QThreadPrivate::start (arg=0x1058980) at thread/qthread_unix.cpp:337
#5  0x00007f10655306aa in start_thread (arg=0x7f1059707700) at pthread_create.c:333
#6  0x00007f10680a5eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f106b8d4800 (LWP 28274)):
[KCrash Handler]
#6  0x00007f10673f06f0 in QQuickWindow::maybeUpdate() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f10673dd073 in QQuickItemPrivate::dirty(QQuickItemPrivate::DirtyType) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f10673e7955 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007f106899d1d1 in QObject::event (this=0x1889ea0, e=<optimized out>) at kernel/qobject.cpp:1245
#10 0x00007f10673e712b in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f1069dc6b8c in QApplicationPrivate::notify_helper (this=this@entry=0x102acc0, receiver=receiver@entry=0x1889ea0, e=e@entry=0x7f1038146a10) at kernel/qapplication.cpp:3720
#12 0x00007f1069dcc230 in QApplication::notify (this=0x7fff0e03b770, receiver=0x1889ea0, e=0x7f1038146a10) at kernel/qapplication.cpp:3503
#13 0x00007f106896ba9b in QCoreApplication::notifyInternal (this=0x7fff0e03b770, receiver=0x1889ea0, event=event@entry=0x7f1038146a10) at kernel/qcoreapplication.cpp:935
#14 0x00007f106896dbd7 in QCoreApplication::sendEvent (event=0x7f1038146a10, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#15 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x102a330) at kernel/qcoreapplication.cpp:1552
#16 0x00007f106896e108 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#17 0x00007f10689c29f3 in postEventSourceDispatch (s=0x10a2a30) at kernel/qeventdispatcher_glib.cpp:271
#18 0x00007f1065010f87 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007f10650111e0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007f106501128c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007f10689c2dff in QEventDispatcherGlib::processEvents (this=0x10a32a0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#22 0x00007f10689692da in QEventLoop::exec (this=this@entry=0x7fff0e03b650, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#23 0x00007f1068970e4c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#24 0x00007f106981309c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#25 0x00007f1069dc3025 in QApplication::exec () at kernel/qapplication.cpp:2956
#26 0x000000000040ef7b in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:55

Possible duplicates by query: bug 351786, bug 351095, bug 351093, bug 350681, bug 350197.

Zgłoś do https://bugs.kde.org/

*** Bug 351786 has been marked as a duplicate of this bug. ***

*** Bug 351926 has been marked as a duplicate of this bug. ***

*** Bug 352358 has been marked as a duplicate of this bug. ***

*** Bug 352774 has been marked as a duplicate of this bug. ***

It is possible that the fix for bug 344651 (going to be released with Plasma 5.4.3) also affects this one.

*** Bug 354535 has been marked as a duplicate of this bug. ***

Created attachment 95963 [details]
New crash information added by DrKonqi

systemsettings5 (5.4.1) using Qt 5.4.2

- What I was doing when the application crashed:

Went to Display and Monitor, Clicked compositor.

-- Backtrace (Reduced):
#6  0x00007ff3512966d0 in QQuickWindow::maybeUpdate() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007ff351283053 in QQuickItemPrivate::dirty(QQuickItemPrivate::DirtyType) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
[...]
#9  0x00007ff352842651 in QObject::event (this=0x19a5320, e=<optimized out>) at kernel/qobject.cpp:1245
#10 0x00007ff35128d10b in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007ff353c94b8c in QApplicationPrivate::notify_helper (this=this@entry=0x119fca0, receiver=receiver@entry=0x19a5320, e=e@entry=0x7ff32015de40) at kernel/qapplication.cpp:3720

Created attachment 96423 [details]
New crash information added by DrKonqi

systemsettings5 (5.4.1) using Qt 5.4.2

- What I was doing when the application crashed:
Openned Display settings in system-settings window then after closing window it always crashes.

-- Backtrace (Reduced):
#6  0x00007f1e6d9d66d0 in QQuickWindow::maybeUpdate() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f1e6d9c3053 in QQuickItemPrivate::dirty(QQuickItemPrivate::DirtyType) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
[...]
#9  0x00007f1e6ef82651 in QObject::event (this=0x2d31bb0, e=<optimized out>) at kernel/qobject.cpp:1245
#10 0x00007f1e6d9cd10b in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f1e703d4b8c in QApplicationPrivate::notify_helper (this=this@entry=0x250b750, receiver=receiver@entry=0x2d31bb0, e=e@entry=0x7f1e3c13a340) at kernel/qapplication.cpp:3720

Created attachment 96871 [details]
New crash information added by DrKonqi

systemsettings5 (5.4.1) using Qt 5.4.2

- What I was doing when the application crashed:
1) Open display configuration in system settings   (UI)
2) Press "Overview" button

-- Backtrace (Reduced):
#6  0x00007f5345fce6d0 in QQuickWindow::maybeUpdate() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f5345fbb053 in QQuickItemPrivate::dirty(QQuickItemPrivate::DirtyType) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
[...]
#9  0x00007f534757a651 in QObject::event (this=0x10d3640, e=<optimized out>) at kernel/qobject.cpp:1245
#10 0x00007f5345fc510b in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f53489ccb8c in QApplicationPrivate::notify_helper (this=this@entry=0x8a3ca0, receiver=receiver@entry=0x10d3640, e=e@entry=0x7f53141dcef0) at kernel/qapplication.cpp:3720

Created attachment 97050 [details]
New crash information added by DrKonqi

systemsettings5 (5.4.1) using Qt 5.4.2

- What I was doing when the application crashed: i copy my files from the external hard disk and i saw the video option in the control menu after i close the window and the system said me that it was an error

-- Backtrace (Reduced):
#6  0x00007f1f490e56d0 in QQuickWindow::maybeUpdate() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f1f490d2053 in QQuickItemPrivate::dirty(QQuickItemPrivate::DirtyType) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
[...]
#9  0x00007f1f4a691651 in QObject::event (this=0x21916b0, e=<optimized out>) at kernel/qobject.cpp:1245
#10 0x00007f1f490dc10b in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f1f4bae3b8c in QApplicationPrivate::notify_helper (this=this@entry=0xe7e6f0, receiver=receiver@entry=0x21916b0, e=e@entry=0x7f1efc14aa30) at kernel/qapplication.cpp:3720

Created attachment 97771 [details]
New crash information added by DrKonqi

systemsettings5 (5.4.1) using Qt 5.4.2

- What I was doing when the application crashed:

Application: Параметры системы (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f5499e8b800 (LWP 2548))]

Thread 2 (Thread 0x7f54991a4700 (LWP 2553)):
#0  0x00000038928fb88d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x0000003896409bd2 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x000000389640b74f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f5499a02a39 in QXcbEventReader::run (this=0x21d7eb0) at qxcbconnection.cpp:1105
#4  0x000000389b4a22be in QThreadPrivate::start (arg=0x21d7eb0) at thread/qthread_unix.cpp:337
#5  0x00000038930076aa in start_thread (arg=0x7f54991a4700) at pthread_create.c:333
#6  0x0000003892906e9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f5499e8b800 (LWP 2548)):
[KCrash Handler]
#6  0x00000038b33916d0 in QQuickWindow::maybeUpdate() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00000038b337e053 in QQuickItemPrivate::dirty(QQuickItemPrivate::DirtyType) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00000038b3388935 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x000000389b6b3651 in QObject::event (this=0x2a1ea00, e=<optimized out>) at kernel/qobject.cpp:1245
#10 0x00000038b338810b in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00000038a1959b8c in QApplicationPrivate::notify_helper (this=this@entry=0x21bb0a0, receiver=receiver@entry=0x2a1ea00, e=e@entry=0x7f5474182b40) at kernel/qapplication.cpp:3720
#12 0x00000038a195f230 in QApplication::notify (this=0x7ffdf7f87ee0, receiver=0x2a1ea00, e=0x7f5474182b40) at kernel/qapplication.cpp:3503
#13 0x000000389b681f1b in QCoreApplication::notifyInternal (this=0x7ffdf7f87ee0, receiver=0x2a1ea00, event=event@entry=0x7f5474182b40) at kernel/qcoreapplication.cpp:935
#14 0x000000389b684057 in QCoreApplication::sendEvent (event=0x7f5474182b40, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#15 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x21ba6e0) at kernel/qcoreapplication.cpp:1552
#16 0x000000389b684588 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#17 0x000000389b6d8e73 in postEventSourceDispatch (s=0x220eb40) at kernel/qeventdispatcher_glib.cpp:271
#18 0x0000003894849ff7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x000000389484a250 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x000000389484a2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x000000389b6d927f in QEventDispatcherGlib::processEvents (this=0x220faa0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#22 0x000000389b67f75a in QEventLoop::exec (this=this@entry=0x7ffdf7f87dc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#23 0x000000389b6872cc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#24 0x000000389fce000c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#25 0x00000038a1956025 in QApplication::exec () at kernel/qapplication.cpp:2956
#26 0x000000000040f04b in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:55

-- Backtrace (Reduced):
#6  0x00000038b33916d0 in QQuickWindow::maybeUpdate() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00000038b337e053 in QQuickItemPrivate::dirty(QQuickItemPrivate::DirtyType) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
[...]
#9  0x000000389b6b3651 in QObject::event (this=0x2a1ea00, e=<optimized out>) at kernel/qobject.cpp:1245
#10 0x00000038b338810b in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00000038a1959b8c in QApplicationPrivate::notify_helper (this=this@entry=0x21bb0a0, receiver=receiver@entry=0x2a1ea00, e=e@entry=0x7f5474182b40) at kernel/qapplication.cpp:3720

*** Bug 360592 has been marked as a duplicate of this bug. ***

No reports for Plasma 5.4.3 or newer.
Marking as fixed.

For more information, please see bug 344651.

[KCrash Handler]
#4  0x00007fa960ee1ef5 in raise () from /usr/lib/libc.so.6
#5  0x00007fa960ecb862 in abort () from /usr/lib/libc.so.6
#6  0x00007fa9614249ac in QMessageLogger::fatal(char const*, ...) const () from /usr/lib/libQt5Core.so.5
#7  0x00007fa961423d59 in qt_assert(char const*, char const*, int) () from /usr/lib/libQt5Core.so.5
#8  0x00007fa95000e0a7 in ?? () from /usr/lib/libKF5Kirigami2.so.5
#9  0x00007fa95001c3ef in ?? () from /usr/lib/libKF5Kirigami2.so.5
#10 0x00007fa961680d86 in ?? () from /usr/lib/libQt5Core.so.5
#11 0x00007fa95000f153 in ?? () from /usr/lib/libKF5Kirigami2.so.5
#12 0x00007fa961676532 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#13 0x00007fa96221c752 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#14 0x00007fa961649a2a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#15 0x00007fa96164c523 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt5Core.so.5
#16 0x00007fa9616a3054 in ?? () from /usr/lib/libQt5Core.so.5
#17 0x00007fa95f2e5f9c in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#18 0x00007fa95f339a49 in ?? () from /usr/lib/libglib-2.0.so.0
#19 0x00007fa95f2e36f1 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#20 0x00007fa9616a2691 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#21 0x00007fa9616483ac in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#22 0x00007fa961650844 in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#23 0x000055f5be076960 in ?? ()
#24 0x00007fa960eccb25 in __libc_start_main () from /usr/lib/libc.so.6
#25 0x000055f5be07747e in _start ()
[Inferior 1 (process 4544) detached]

The new report is unrelated, closing again