Bug 395369

Summary:	kate segmentation fault when hovering over scrollbar minimap under wayland session
Product:	[Applications] kate	Reporter:	Ardith Metz <itgvkxsd>
Component:	general	Assignee:	KWrite Developers <kwrite-bugs-null>
Status:	RESOLVED FIXED
Severity:	crash	CC:	bilal.elmas, bugseforuns, cmbraaksma, kare.sars, luizdl, mccilloni, notuxius, null, vishnugb
Priority:	NOR	Keywords:	wayland
Version:	unspecified
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	New crash information added by DrKonqi New crash information added by DrKonqi New crash information added by DrKonqi

Description Ardith Metz 2018-06-14 13:07:14 UTC

Under plasma wayland session kate always crashes when I hover mouse over scrollbar minimap. This doesn't happen with kwrite.

Kde plasma:5.13
Kde frameworks: 5.47
Qt: 5.11
Distro: Archlinux

It also happened with older versions of the above (at least for couple months).

Below is backtrace from drkonqi (I know on Archlinux it's worthless but it's all I have):

Application: Kate (kate), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x65e771a14680 (LWP 8533))]

Thread 3 (Thread 0x65e74c134700 (LWP 8536)):
#0  0x000065e767de5ffc in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x000065e74cf100a4 in ?? () from /usr/lib/dri/i965_dri.so
#2  0x000065e74cf0fd98 in ?? () from /usr/lib/dri/i965_dri.so
#3  0x000065e767de0075 in start_thread () from /usr/lib/libpthread.so.0
#4  0x000065e76c35653f in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x65e759e65700 (LWP 8534)):
#0  0x000065e76c34bea9 in poll () from /usr/lib/libc.so.6
#1  0x000065e765dc2523 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x000065e765dc263e in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x000065e76cc67e64 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x000065e76cc1385c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x000065e76ca5cac9 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#6  0x000065e76d0b7976 in ?? () from /usr/lib/libQt5DBus.so.5
#7  0x000065e76ca66b95 in ?? () from /usr/lib/libQt5Core.so.5
#8  0x000065e767de0075 in start_thread () from /usr/lib/libpthread.so.0
#9  0x000065e76c35653f in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x65e771a14680 (LWP 8533)):
[KCrash Handler]
#6  0x000065e76cc1e047 in QMetaObject::cast(QObject const*) const () from /usr/lib/libQt5Core.so.5
#7  0x000065e76e0eb384 in QApplicationPrivate::notifyActiveWindowChange(QWindow*) () from /usr/lib/libQt5Widgets.so.5
#8  0x000065e76d91f3d5 in QGuiApplicationPrivate::processActivatedEvent(QWindowSystemInterfacePrivate::ActivatedWindowEvent*) () from /usr/lib/libQt5Gui.so.5
#9  0x000065e76d91f60e in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/libQt5Gui.so.5
#10 0x000065e76d8f6a5c in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
#11 0x000065e75f6d0f7d in ?? () from /usr/lib/libQt5WaylandClient.so.5
#12 0x000065e76cc1385c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#13 0x000065e76cc1bb56 in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#14 0x00000443b2c9a6bd in ?? ()
#15 0x000065e76c28106b in __libc_start_main () from /usr/lib/libc.so.6
#16 0x00000443b2c9beba in _start ()

Comment 1 Ardith Metz 2018-06-14 19:00:34 UTC

Actually it's reproducible with kwrite too:

Application: KWrite (kwrite), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x6696fdeb0800 (LWP 11118))]

Thread 3 (Thread 0x6696d8e2e700 (LWP 11121)):
#0  0x00006696f4f21ffc in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00006696d9c0a0a4 in ?? () from /usr/lib/dri/i965_dri.so
#2  0x00006696d9c09d98 in ?? () from /usr/lib/dri/i965_dri.so
#3  0x00006696f4f1c075 in start_thread () from /usr/lib/libpthread.so.0
#4  0x00006696f9f5553f in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x6696e6305700 (LWP 11119)):
#0  0x00006696f9f46934 in read () from /usr/lib/libc.so.6
#1  0x00006696f3194ed1 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00006696f314eff8 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#3  0x00006696f314f4c6 in ?? () from /usr/lib/libglib-2.0.so.0
#4  0x00006696f314f63e in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#5  0x00006696fa866e64 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#6  0x00006696fa81285c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#7  0x00006696fa65bac9 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#8  0x00006696f5c75976 in ?? () from /usr/lib/libQt5DBus.so.5
#9  0x00006696fa665b95 in ?? () from /usr/lib/libQt5Core.so.5
#10 0x00006696f4f1c075 in start_thread () from /usr/lib/libpthread.so.0
#11 0x00006696f9f5553f in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x6696fdeb0800 (LWP 11118)):
[KCrash Handler]
#6  0x0000000000000001 in ?? ()
#7  0x00006696fa81d049 in QMetaObject::cast(QObject const*) const () from /usr/lib/libQt5Core.so.5
#8  0x00006696fb589384 in QApplicationPrivate::notifyActiveWindowChange(QWindow*) () from /usr/lib/libQt5Widgets.so.5
#9  0x00006696fadbd3d5 in QGuiApplicationPrivate::processActivatedEvent(QWindowSystemInterfacePrivate::ActivatedWindowEvent*) () from /usr/lib/libQt5Gui.so.5
#10 0x00006696fadbd60e in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/libQt5Gui.so.5
#11 0x00006696fad94a5c in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
#12 0x00006696ebb70f7d in ?? () from /usr/lib/libQt5WaylandClient.so.5
#13 0x00006696fa81285c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#14 0x00006696fa81ab56 in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#15 0x0000026de6f575b9 in main ()

Comment 2 Ardith Metz 2018-06-16 08:52:50 UTC

It doesn't happen in kate from flatpak so it can be related to QT version (flatpak uses 5.9.5)

Comment 3 Ardith Metz 2018-06-25 15:25:52 UTC

The temporary workaround is to force to use xcb backend on wayland with:

QT_QPA_PLATFORM=xcb kate

Comment 4 Kåre Särs 2018-07-04 10:58:47 UTC

Thanks for the report,

I can not reproduce this in KDE NEON (Kate 18.04.2, KF5 5.47.0, Qt 5.11.0 on Plasma 15.13.2 (Wayland session)

I do see a lot of flickering tho, but no crash...

The crash thread also does not show any trace of KTextEditor code. My guess is that it is a Qt bug. For debugging Qt bugs, it would be good to get a new crash dump with the debug symbols for Qt(libQt5Core, libQt5Gui and libQt5Widgets)

Comment 5 Ardith Metz 2018-07-10 23:15:50 UTC

Hi Kåre Särs,

I installed QT with debug support and got the below. I hope it will be helpful.

Application: Kate (kate), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x6ec8e7cfd800 (LWP 24739))]

Thread 3 (Thread 0x6ec8c21b5700 (LWP 24742)):
#0  0x00006ec8dea48ffc in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00006ec8c2f91124 in ?? () from /usr/lib/dri/i965_dri.so
#2  0x00006ec8c2f90e18 in ?? () from /usr/lib/dri/i965_dri.so
#3  0x00006ec8dea43075 in start_thread () from /usr/lib/libpthread.so.0
#4  0x00006ec8e263953f in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x6ec8cff50700 (LWP 24740)):
#0  0x00006ec8e2d3e78c in QMutex::lock (this=this@entry=0xa14de25f160) at /usr/include/c++/8.1.1/bits/atomic_base.h:742
#1  0x00006ec8e2f4cfd1 in QMutexLocker::QMutexLocker (m=0xa14de25f160, this=<synthetic pointer>) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:206
#2  QThreadData::canWaitLocked (this=0xa14de25f130) at ../../include/QtCore/5.11.1/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:254
#3  postEventSourcePrepare (s=0x6ec8c8004fd0, timeout=0x6ec8cff4fb94) at kernel/qeventdispatcher_glib.cpp:259
#4  0x00006ec8da30aa49 in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0
#5  0x00006ec8da30b44e in ?? () from /usr/lib/libglib-2.0.so.0
#6  0x00006ec8da30b63e in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#7  0x00006ec8e2f4d0c4 in QEventDispatcherGlib::processEvents (this=0x6ec8c8000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#8  0x00006ec8e2ef89bc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#9  0x00006ec8e2d41b09 in QThread::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#10 0x00006ec8e339d086 in QDBusConnectionManager::run (this=0x6ec8e3617080 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:178
#11 0x00006ec8e2d4bbb5 in QThreadPrivate::start(void*) () at thread/qthread_unix.cpp:367
#12 0x00006ec8dea43075 in start_thread () from /usr/lib/libpthread.so.0
#13 0x00006ec8e263953f in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x6ec8e7cfd800 (LWP 24739)):
[KCrash Handler]
#6  0x00006ec8e2f031a7 in QMetaObject::cast (this=0x6ec8e4ab0a60 <QWidgetWindow::staticMetaObject>, obj=obj@entry=0xa14def773c0) at kernel/qmetaobject.cpp:366
#7  0x00006ec8e2f031e6 in QMetaObject::cast (this=<optimized out>, obj=obj@entry=0xa14def773c0) at kernel/qmetaobject.cpp:355
#8  0x00006ec8e43d9504 in qobject_cast<QWidgetWindow*> (object=0xa14def773c0) at ../../include/QtCore/../../src/corelib/kernel/qobject.h:499
#9  QApplicationPrivate::notifyActiveWindowChange (this=<optimized out>, previous=<optimized out>) at kernel/qapplication.cpp:2186
#10 0x00006ec8e3c02d35 in QGuiApplicationPrivate::processActivatedEvent (e=<optimized out>) at kernel/qguiapplication.cpp:2304
#11 0x00006ec8e3c02f6e in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0xa14def7fda0) at kernel/qguiapplication.cpp:1837
#12 0x00006ec8e3bdcbfc in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:1032
#13 0x00006ec8d57be5ed in QPAEventDispatcherGlib::processEvents (this=0xa14de22bb70, flags=...) at qeventdispatcher_glib.cpp:70
#14 0x00006ec8e2ef89bc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#15 0x00006ec8e2f00cb6 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#16 0x00000a14ca57d6bd in ?? ()
#17 0x00006ec8e256406b in __libc_start_main () from /usr/lib/libc.so.6
#18 0x00000a14ca57eeba in _start ()

Comment 6 Christoph Feck 2018-07-19 11:31:51 UTC

*** Bug 392401 has been marked as a duplicate of this bug. ***

Comment 7 Christoph Feck 2018-07-19 11:31:59 UTC

*** Bug 395940 has been marked as a duplicate of this bug. ***

Comment 8 Dominik Haumann 2018-08-15 22:10:10 UTC

We just fixed a crash with respect to the text preview over the scrollbar, see bug #397266. Unfortunately, the back traces are not really the same. Still, we'll close for now as needs-info / waiting-for-info.

Can you retry with KDE Frameworks 5.50 once it is released? That would be nice.

Comment 9 Ardith Metz 2018-08-16 11:08:26 UTC

Yes, I'll wait for release and check. Thank you.

Comment 10 Ardith Metz 2018-09-09 11:18:43 UTC

Unfortunately it still occurs with:

Kde plasma:5.13.5
Kde frameworks: 5.50.0
Qt: 5.11.1
Kate/Kwrite 18.08.1
Distro: Archlinux

Application: Kate (kate), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x6aebde5c9800 (LWP 7649))]

Thread 3 (Thread 0x6aebd0f42700 (LWP 7653)):
#0  0x00006aebe4cccafc in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00006aebd1512274 in ?? () from /usr/lib/dri/i965_dri.so
#2  0x00006aebd1511f68 in ?? () from /usr/lib/dri/i965_dri.so
#3  0x00006aebe4cc6a9d in start_thread () from /usr/lib/libpthread.so.0
#4  0x00006aebe63c7a43 in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x6aebdaea4700 (LWP 7651)):
#0  0x00006aebe63bcbb1 in poll () from /usr/lib/libc.so.6
#1  0x00006aebe1964ee0 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00006aebe1964fce in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00006aebe68e84c4 in QEventDispatcherGlib::processEvents (this=0x6aebd4000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00006aebe6893dac in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#5  0x00006aebe66dcf59 in QThread::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#6  0x00006aebe6b3aba6 in QDBusConnectionManager::run (this=0x6aebe6bb6080 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:178
#7  0x00006aebe66e7005 in QThreadPrivate::start(void*) () at thread/qthread_unix.cpp:367
#8  0x00006aebe4cc6a9d in start_thread () from /usr/lib/libpthread.so.0
#9  0x00006aebe63c7a43 in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x6aebde5c9800 (LWP 7649)):
[KCrash Handler]
#6  0x00006aebe689e597 in QMetaObject::cast (this=0x6aebe7858a60 <QWidgetWindow::staticMetaObject>, obj=obj@entry=0x89684864ef0) at kernel/qmetaobject.cpp:366
#7  0x00006aebe689e5d6 in QMetaObject::cast (this=<optimized out>, obj=obj@entry=0x89684864ef0) at kernel/qmetaobject.cpp:355
#8  0x00006aebe7380814 in qobject_cast<QWidgetWindow*> (object=0x89684864ef0) at ../../include/QtCore/../../src/corelib/kernel/qobject.h:499
#9  QApplicationPrivate::notifyActiveWindowChange (this=<optimized out>, previous=<optimized out>) at kernel/qapplication.cpp:2186
#10 0x00006aebe6da7b85 in QGuiApplicationPrivate::processActivatedEvent (e=<optimized out>) at kernel/qguiapplication.cpp:2304
#11 0x00006aebe6da7dbe in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x89683dc8850) at kernel/qguiapplication.cpp:1837
#12 0x00006aebe6d81a4c in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:1032
#13 0x00006aebdde795ed in QPAEventDispatcherGlib::processEvents (this=0x896828cd700, flags=...) at qeventdispatcher_glib.cpp:70
#14 0x00006aebe6893dac in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#15 0x00006aebe689c0a6 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#16 0x0000089643300072 in ?? ()
#17 0x00006aebe62f0223 in __libc_start_main () from /usr/lib/libc.so.6
#18 0x00000896433017ae in _start ()

Comment 11 Ardith Metz 2018-09-20 15:56:49 UTC

Interestingly the crash happens only when hovering over scrollbar minimap is the first action I do after opening file in kate directly.

If I simply click inside the document body or click somewhere in kate toolbar and then hover over scrollbar minimap the crash doesn't happen.

It also doesn't happen when I start kate with empty session and open document trough File -> Open.

Comment 12 Patrick Silva 2018-10-17 19:32:09 UTC

(In reply to Ardith Metz from comment #11)
> Interestingly the crash happens only when hovering over scrollbar minimap is
> the first action I do after opening file in kate directly.
> 
> If I simply click inside the document body or click somewhere in kate
> toolbar and then hover over scrollbar minimap the crash doesn't happen.
> 
> It also doesn't happen when I start kate with empty session and open
> document trough File -> Open.

I can confirm on my system.

Operating System: Arch Linux 
KDE Plasma Version: 5.14.1
Qt Version: 5.12.0 beta2
KDE Frameworks Version: 5.51.0

Application: Kate (kate), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f00dd0d9800 (LWP 3208))]

Thread 3 (Thread 0x7f00d23df700 (LWP 3210)):
#0  0x00007f00e22feafc in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007f00d29cc17c in ?? () from /usr/lib/dri/i965_dri.so
#2  0x00007f00d29cbeb8 in ?? () from /usr/lib/dri/i965_dri.so
#3  0x00007f00e22f8a9d in start_thread () from /usr/lib/libpthread.so.0
#4  0x00007f00e381db23 in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7f00da263700 (LWP 3209)):
#0  0x00007f00e3812c21 in poll () from /usr/lib/libc.so.6
#1  0x00007f00e1890ee0 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7f00d4003ce0, timeout=<optimized out>, context=0x7f00d4000bf0) at ../glib/glib/gmain.c:4221
#2  g_main_context_iterate (context=context@entry=0x7f00d4000bf0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/glib/gmain.c:3915
#3  0x00007f00e1890fce in g_main_context_iteration (context=0x7f00d4000bf0, may_block=1) at ../glib/glib/gmain.c:3981
#4  0x00007f00e3d47624 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007f00e3cf065c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#6  0x00007f00e3b34599 in QThread::exec() () from /usr/lib/libQt5Core.so.5
#7  0x00007f00e3fb8ba6 in ?? () from /usr/lib/libQt5DBus.so.5
#8  0x00007f00e3b3599c in ?? () from /usr/lib/libQt5Core.so.5
#9  0x00007f00e22f8a9d in start_thread () from /usr/lib/libpthread.so.0
#10 0x00007f00e381db23 in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7f00dd0d9800 (LWP 3208)):
[KCrash Handler]
#6  0x00005644d7ba47b0 in ?? ()
#7  0x00007f00e3cfae59 in QMetaObject::cast(QObject const*) const () from /usr/lib/libQt5Core.so.5
#8  0x00007f00e48227b4 in QApplicationPrivate::notifyActiveWindowChange(QWindow*) () from /usr/lib/libQt5Widgets.so.5
#9  0x00007f00e4225765 in QGuiApplicationPrivate::processActivatedEvent(QWindowSystemInterfacePrivate::ActivatedWindowEvent*) () from /usr/lib/libQt5Gui.so.5
#10 0x00007f00e422a33e in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/libQt5Gui.so.5
#11 0x00007f00e4203bac in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
#12 0x00007f00dcd44ce1 in ?? () from /usr/lib/libQt5WaylandClient.so.5
#13 0x00007f00e188f3cf in g_main_dispatch (context=0x5644d70ca3a0) at ../glib/glib/gmain.c:3182
#14 g_main_context_dispatch (context=context@entry=0x5644d70ca3a0) at ../glib/glib/gmain.c:3847
#15 0x00007f00e1890f89 in g_main_context_iterate (context=context@entry=0x5644d70ca3a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/glib/gmain.c:3920
#16 0x00007f00e1890fce in g_main_context_iteration (context=0x5644d70ca3a0, may_block=1) at ../glib/glib/gmain.c:3981
#17 0x00007f00e3d47609 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#18 0x00007f00e3cf065c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#19 0x00007f00e3cf8966 in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#20 0x00005644d5a53072 in ?? ()
#21 0x00007f00e3746223 in __libc_start_main () from /usr/lib/libc.so.6
#22 0x00005644d5a547ae in _start ()
[Inferior 1 (process 3208) detached]

Comment 13 Alexander Mentyu 2018-12-12 20:13:28 UTC

Reproducible on:

Operating System: KDE neon Developer Edition
KDE Plasma Version: 5.14.80
KDE Frameworks Version: 5.54.0
Qt Version: 5.11.2
Kernel Version: 4.15.0-42-generic

Application: Kate (kate), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ff76fdad800 (LWP 5964))]

Thread 2 (Thread 0x7ff755c8e700 (LWP 5968)):
#0  0x00007ff76a6e90b4 in __GI___libc_read (fd=7, buf=0x7ff755c8db60, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007ff76428ccd0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff764248027 in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff7642484e0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ff76424864c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ff76b02804b in QEventDispatcherGlib::processEvents (this=0x7ff750000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0x00007ff76afcc30a in QEventLoop::exec (this=this@entry=0x7ff755c8dd70, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#7  0x00007ff76adf7bba in QThread::exec (this=<optimized out>) at thread/qthread.cpp:525
#8  0x00007ff76b46ee45 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#9  0x00007ff76ae02adb in QThreadPrivate::start (arg=0x7ff76b6e6d60) at thread/qthread_unix.cpp:367
#10 0x00007ff7661cc6db in start_thread (arg=0x7ff755c8e700) at pthread_create.c:463
#11 0x00007ff76a6fa88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7ff76fdad800 (LWP 5964)):
[KCrash Handler]
#6  0x0000000000000000 in ?? ()
#7  0x00007ff76afd7359 in QMetaObject::cast (this=0x7ff76cb87f80 <QWidgetWindow::staticMetaObject>, obj=obj@entry=0x55ebb49dbbf0) at kernel/qmetaobject.cpp:366
#8  0x00007ff76afd7395 in QMetaObject::cast (this=<optimized out>, obj=obj@entry=0x55ebb49dbbf0) at kernel/qmetaobject.cpp:355
#9  0x00007ff76c4c0509 in qobject_cast<QWidgetWindow*> (object=0x55ebb49dbbf0) at ../../include/QtCore/../../src/corelib/kernel/qobject.h:504
#10 QApplicationPrivate::notifyActiveWindowChange (this=<optimized out>, previous=<optimized out>) at kernel/qapplication.cpp:2186
#11 0x00007ff76bcc01c5 in QGuiApplicationPrivate::processActivatedEvent (e=<optimized out>) at kernel/qguiapplication.cpp:2309
#12 0x00007ff76bcc042d in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x55ebb4904580) at kernel/qguiapplication.cpp:1838
#13 0x00007ff76bc98f5b in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:1032
#14 0x00007ff75a77773b in QPAEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5WaylandClient.so.5
#15 0x00007ff76afcc30a in QEventLoop::exec (this=this@entry=0x7ffdebd1cf50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:214
#16 0x00007ff76afd54d0 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1336
#17 0x000055ebb26fc11c in main (argc=<optimized out>, argv=<optimized out>) at ./kate/main.cpp:639

Comment 14 Ardith Metz 2018-12-16 11:28:31 UTC

Still reproducible on:

KDE Plasma: 5.14.4
KDE Frameworks: 5.53.0
Qt: 5.12.0
Kate/Kwrite 18.12.0
Distro: Archlinux

Application: Kate (kate), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x67463825a080 (LWP 19591))]

Thread 3 (Thread 0x67462e72e700 (LWP 19594)):
#0  0x000067463d31fafc in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x000067462ed08c24 in ?? () from /usr/lib/dri/i965_dri.so
#2  0x000067462ed08948 in ?? () from /usr/lib/dri/i965_dri.so
#3  0x000067463d319a9d in start_thread () from /usr/lib/libpthread.so.0
#4  0x000067463e2ceb23 in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x67463619d700 (LWP 19592)):
#0  0x000067463e2c3c21 in poll () from /usr/lib/libc.so.6
#1  0x000067463ab04ee0 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x000067463ab04fce in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x000067463e7fa5c4 in QEventDispatcherGlib::processEvents (this=0x674630000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#4  0x000067463e7a358c in QEventLoop::exec (this=this@entry=0x67463619cd70, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#5  0x000067463e5e75c9 in QThread::exec (this=this@entry=0x67463eae9080 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#6  0x000067463ea6dba6 in QDBusConnectionManager::run (this=0x67463eae9080 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:178
#7  0x000067463e5e89cc in QThreadPrivate::start (arg=0x67463eae9080 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:361
#8  0x000067463d319a9d in start_thread () from /usr/lib/libpthread.so.0
#9  0x000067463e2ceb23 in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x67463825a080 (LWP 19591)):
[KCrash Handler]
#6  0x00000933d65ffad0 in ?? ()
#7  0x000067463e7add89 in QMetaObject::cast (this=0x67463f7c3a00 <QWidgetWindow::staticMetaObject>, obj=obj@entry=0x933d65ff830) at kernel/qmetaobject.cpp:368
#8  0x000067463e7addc6 in QMetaObject::cast (this=<optimized out>, obj=obj@entry=0x933d65ff830) at kernel/qmetaobject.cpp:357
#9  0x000067463f2e47b4 in qobject_cast<QWidgetWindow*> (object=0x933d65ff830) at ../../include/QtCore/../../src/corelib/kernel/qobject.h:499
#10 QApplicationPrivate::notifyActiveWindowChange (this=<optimized out>, previous=<optimized out>) at kernel/qapplication.cpp:2187
#11 0x000067463ece2345 in QGuiApplicationPrivate::processActivatedEvent (e=<optimized out>) at kernel/qguiapplication.cpp:2325
#12 0x000067463ece6f1e in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x933d663a8d0) at kernel/qguiapplication.cpp:1858
#13 0x000067463ecc075c in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:1068
#14 0x0000674637ec9e71 in userEventSourceDispatch (source=<optimized out>) at qeventdispatcher_glib.cpp:74
#15 0x000067463ab033cf in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#16 0x000067463ab04f89 in ?? () from /usr/lib/libglib-2.0.so.0
#17 0x000067463ab04fce in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#18 0x000067463e7fa5a9 in QEventDispatcherGlib::processEvents (this=0x933d4460ee0, flags=...) at kernel/qeventdispatcher_glib.cpp:422
#19 0x000067463e7a358c in QEventLoop::exec (this=this@entry=0x7e8db4a68a80, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140
#20 0x000067463e7ab896 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:120
#21 0x00000933c9ee53a8 in ?? ()
#22 0x000067463e1f7223 in __libc_start_main () from /usr/lib/libc.so.6
#23 0x00000933c9ee6b9e in _start ()
[Inferior 1 (process 19591) detached]

Comment 15 Christoph Feck 2018-12-27 19:30:47 UTC

*** Bug 401698 has been marked as a duplicate of this bug. ***

Comment 16 Christoph Feck 2018-12-27 19:31:53 UTC

*** Bug 401720 has been marked as a duplicate of this bug. ***

Comment 17 Vishnu 2019-01-17 17:47:02 UTC

Created attachment 117517 [details]
New crash information added by DrKonqi

kwrite (18.12.1) using Qt 5.12.0

- What I was doing when the application crashed:

The crash happens as soon as the mouse begins hovering over the code map on the right.

-- Backtrace (Reduced):
#8  0x00007f9f88d277b4 in QApplicationPrivate::notifyActiveWindowChange(QWindow*) () from /usr/lib/libQt5Widgets.so.5
#9  0x00007f9f8872a345 in QGuiApplicationPrivate::processActivatedEvent(QWindowSystemInterfacePrivate::ActivatedWindowEvent*) () from /usr/lib/libQt5Gui.so.5
#10 0x00007f9f8872ef1e in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/libQt5Gui.so.5
#11 0x00007f9f8870875c in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
[...]
#16 0x00007f9f88349559 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5

Comment 18 Ardith Metz 2019-02-13 21:56:39 UTC

It seems not longer reproducible on:
KDE Plasma: 5.15.0
KDE Frameworks: 5.55.0
Qt: 5.12.1
Kate/Kwrite 18.12.2
Distro: Archlinux

Comment 19 Sem 2019-02-20 11:23:46 UTC

Created attachment 118211 [details]
New crash information added by DrKonqi

kwrite (18.12.0) using Qt 5.11.3

- What I was doing when the application crashed:

Hey, so apparently this still happens sometimes. I'm on Fedora 29 and opened a tab delimited file. Kwrite continues crashing everytime I point to the scrolling preview thing. Hopefully this will help in resolving the issue.

-- Backtrace (Reduced):
#7  0x00007f64a1aa5b61 in QApplicationPrivate::notifyActiveWindowChange(QWindow*) () from /lib64/libQt5Widgets.so.5
#8  0x00007f64a1553495 in QGuiApplicationPrivate::processActivatedEvent(QWindowSystemInterfacePrivate::ActivatedWindowEvent*) () from /lib64/libQt5Gui.so.5
#9  0x00007f64a15536cd in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /lib64/libQt5Gui.so.5
#10 0x00007f64a152e70b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Gui.so.5
[...]
#12 0x00007f64a111be0b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5

Comment 20 Ardith Metz 2019-02-20 12:09:15 UTC

(In reply to Sem from comment #19)
> Created attachment 118211 [details]
> New crash information added by DrKonqi
> 
> kwrite (18.12.0) using Qt 5.11.3
> 
> - What I was doing when the application crashed:
> 
> Hey, so apparently this still happens sometimes. I'm on Fedora 29 and opened
> a tab delimited file. Kwrite continues crashing everytime I point to the
> scrolling preview thing. Hopefully this will help in resolving the issue.
> 

This issue should be already solved with system setup as described in: https://bugs.kde.org/show_bug.cgi?id=395369#c18 . You have to wait till your distro updates their packages.

Comment 21 Daniel 2019-08-11 17:36:00 UTC

Created attachment 122067 [details]
New crash information added by DrKonqi

kate (18.08.0) using Qt 5.11.3

- What I was doing when the application crashed:
Passed mouse over scroll bar when activated the option "show text preview on scroll bar" under Wayland 

- Custom settings of the application:
When is checked the option "show text preview on scroll bar"

-- Backtrace (Reduced):
#8  0x00007fdd61c9db79 in QApplicationPrivate::notifyActiveWindowChange(QWindow*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#9  0x00007fdd616c5ce5 in QGuiApplicationPrivate::processActivatedEvent(QWindowSystemInterfacePrivate::ActivatedWindowEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#10 0x00007fdd616c5f1d in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#11 0x00007fdd616a006b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
[...]
#13 0x00007fdd6119a27b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5