Bug 394539

Summary: KWin crashes when activating Window Overview with top left hotcorner
Product: [Plasma] kwin Reporter: Otto Radics <otto.radics>
Component: generalAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED WORKSFORME    
Severity: crash CC: cfraz89
Priority: NOR Keywords: drkonqi, triaged
Version: 5.12.5   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: New crash information added by DrKonqi

Description Otto Radics 2018-05-21 20:16:04 UTC 
Application: kwin_x11 (5.12.5)

Qt Version: 5.10.1
Frameworks Version: 5.46.0
Operating System: Linux 4.14.39-1-MANJARO x86_64
Distribution: "Manjaro Linux"

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

I moved th mouse cursor to the top-left corner to activate Window Overview. 

Details about the device: 
- XPS 9550 4K with Nvidia 960M
- Manjaro - everything is up-to-date

The crash can be reproduced sometimes.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f6900aa6840 (LWP 8322))]

Thread 5 (Thread 0x7f68c6f3a700 (LWP 8594)):
#0  0x00007f6900432fa6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f68fd831db3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f68fd83354f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f68fd7d831b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f68fd5e771e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f68f7f2e319 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f68fd5ecabd in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f68f9462075 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f690043d53f in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f68c6739700 (LWP 8334)):
#0  0x00007f68f9467ffc in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f68fc724f77 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f68fc724fb9 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f68f9462075 in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f690043d53f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f68cde21700 (LWP 8329)):
#0  0x00007f6900432fa6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f68fd831db3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f68fd83354f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f68fd7d831b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f68fd5e771e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f68f7f2e319 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f68fd5ecabd in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f68f9462075 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f690043d53f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f68dffff700 (LWP 8326)):
#0  0x00007f6900432fa6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f68fd831db3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f68fd83354f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f68fd7d831b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f68fd5e771e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f68f6dcd416 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007f68fd5ecabd in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f68f9462075 in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f690043d53f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f6900aa6840 (LWP 8322)):
[KCrash Handler]
#6  0x000055e958ca8290 in  ()
#7  0x00007f68fff5a84a in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib/libkwin.so.5
#8  0x00007f68fd7d6d4f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/libQt5Core.so.5
#9  0x00007f68e7b303f2 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/libQt5XcbQpa.so.5
#10 0x00007f68e7b3107e in QXcbConnection::processXcbEvents() () at /usr/lib/libQt5XcbQpa.so.5
#11 0x00007f68fd80b052 in QObject::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#12 0x00007f68fe557fec in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#13 0x00007f68fe55f9c6 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#14 0x00007f68fd7d9ce0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#15 0x00007f68fd7dc946 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt5Core.so.5
#16 0x00007f68fd833366 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#17 0x00007f68e7bb671e in  () at /usr/lib/libQt5XcbQpa.so.5
#18 0x00007f68fd7d831b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#19 0x00007f68fd7e1718 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#20 0x00007f6900709416 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#21 0x00007f690036806b in __libc_start_main () at /usr/lib/libc.so.6
#22 0x000055e955cdb75a in _start ()

Reported using DrKonqi
Comment 1 Martin Flöser 2018-05-22 04:13:01 UTC 
Unfortunately the backtrace is lacking debug symbols. If you are able to reproduce please install debug packages and attach a new backtrace.
Comment 2 Otto Radics 2018-05-22 10:02:50 UTC 
Which packages should I install on Manjaro?
Comment 3 Christoph Feck 2018-05-22 13:40:46 UTC 
Please ask for help in a forum of your distribution.
Comment 4 Chris Fraser 2018-06-11 13:21:58 UTC 
Created attachment 113216 [details]
New crash information added by DrKonqi

kwin_x11 (5.12.5) using Qt 5.10.1

- What I was doing when the application crashed:
Moving mouse to top left for overview. Also an Nvidia system, using Nouveau drivers.

- Custom settings:
Only modification is using Arc window decoration.

-- Backtrace (Reduced):
#7  0x00007fcd10969109 in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () from /lib64/libkwin.so.5
#8  0x00007fcd08178c2c in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () from /lib64/libQt5Core.so.5
#9  0x00007fccec4b9c84 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () from /lib64/libQt5XcbQpa.so.5
#10 0x00007fccec4ba843 in QXcbConnection::processXcbEvents() () from /lib64/libQt5XcbQpa.so.5
#11 0x00007fcd081a4a26 in QObject::event(QEvent*) () from /lib64/libQt5Core.so.5
Comment 5 Christoph Feck 2018-06-11 13:28:41 UTC 
Chris, if you are able to reproduce this crash, please add a backtrace with debug symbol information.
Comment 6 Andrew Crouthamel 2018-09-28 03:40:42 UTC 
Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days, the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information.

For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please set the bug status as REPORTED so that the KDE team knows that the bug is ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!
Comment 7 Andrew Crouthamel 2018-10-29 02:08:32 UTC 
Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information.

For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!