Bug 412008

Summary: kwin crashed after VT switch from another X session
Product: [Plasma] kwin Reporter: Andriy Gapon <avg>
Component: generalAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED WORKSFORME    
Severity: crash Keywords: drkonqi
Priority: NOR    
Version: 5.16.2   
Target Milestone: ---   
Platform: FreeBSD Ports   
OS: FreeBSD   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Andriy Gapon 2019-09-18 05:17:10 UTC 
Application: kwin_x11 (5.16.2)

Qt Version: 5.12.2
Frameworks Version: 5.59.0
Operating System: FreeBSD 12.0-CURRENT amd64
Distribution (Platform): FreeBSD Ports

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

I switched to my X / KDE session from another session (using Ctrl+Alt+F9).

The crash can be reproduced sometimes.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
[KCrash Handler]
#6  0x000000080c359b5a in thr_kill () at thr_kill.S:3
#7  0x000000080c359b24 in __raise (s=6) at /usr/src/lib/libc/gen/raise.c:52
#8  0x000000080c359a99 in abort () at /usr/src/lib/libc/stdlib/abort.c:65
#9  0x000000080b2a46e9 in QMessageLogger::fatal(char const*, ...) const () at /usr/local/lib/qt5/libQt5Core.so.5
#10 0x000000081eb2f9d9 in  () at /usr/local/lib/qt5/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#11 0x000000080b4b5eff in QMetaObject::activate(QObject*, int, int, void**) () at /usr/local/lib/qt5/libQt5Core.so.5
#12 0x000000080b4be7c4 in QTimer::timerEvent(QTimerEvent*) () at /usr/local/lib/qt5/libQt5Core.so.5
#13 0x000000080b4aedd3 in QObject::event(QEvent*) () at /usr/local/lib/qt5/libQt5Core.so.5
#14 0x0000000809f79660 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/local/lib/qt5/libQt5Widgets.so.5
#15 0x0000000809f7ac26 in QApplication::notify(QObject*, QEvent*) () at /usr/local/lib/qt5/libQt5Widgets.so.5
#16 0x000000080b482d80 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/local/lib/qt5/libQt5Core.so.5
#17 0x000000080b4dae2f in QTimerInfoList::activateTimers() () at /usr/local/lib/qt5/libQt5Core.so.5
#18 0x000000080b4d9285 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/local/lib/qt5/libQt5Core.so.5
#19 0x000000080b47e76e in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/local/lib/qt5/libQt5Core.so.5
#20 0x000000080b2abbb9 in QThread::exec() () at /usr/local/lib/qt5/libQt5Core.so.5
#21 0x000000080b2acbb4 in  () at /usr/local/lib/qt5/libQt5Core.so.5
#22 0x000000080c05bc55 in thread_start (curthread=0x809d78900) at /usr/src/lib/libthr/thread/thr_create.c:289
#23 0x0000000000000000 in  ()

Thread 3 (LWP 102936 of process 45924):
#1  0x000000080c05ee0c in __thr_ppoll (pfd=0x819bf6018, nfds=1, timeout=0x0, newsigmask=0x0) at /usr/src/lib/libthr/thread/thr_syscalls.c:356
#2  0x000000080b4d79ff in qt_safe_poll(pollfd*, unsigned int, timespec const*) () at /usr/local/lib/qt5/libQt5Core.so.5
#3  0x000000080b4d918a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/local/lib/qt5/libQt5Core.so.5
#4  0x000000080b47e76e in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/local/lib/qt5/libQt5Core.so.5
#5  0x000000080b2abbb9 in QThread::exec() () at /usr/local/lib/qt5/libQt5Core.so.5
#6  0x0000000803157179 in  () at /usr/local/lib/qt5/libQt5Qml.so.5
#7  0x000000080b2acbb4 in  () at /usr/local/lib/qt5/libQt5Core.so.5
#8  0x000000080c05bc55 in thread_start (curthread=0x809d3d000) at /usr/src/lib/libthr/thread/thr_create.c:289
#9  0x0000000000000000 in  ()

Thread 2 (LWP 102931 of process 45924):
#1  0x000000080c05ee0c in __thr_ppoll (pfd=0x800b83b18, nfds=1, timeout=0x0, newsigmask=0x0) at /usr/src/lib/libthr/thread/thr_syscalls.c:356
#2  0x000000080b4d79ff in qt_safe_poll(pollfd*, unsigned int, timespec const*) () at /usr/local/lib/qt5/libQt5Core.so.5
#3  0x000000080b4d918a in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/local/lib/qt5/libQt5Core.so.5
#4  0x000000080b47e76e in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/local/lib/qt5/libQt5Core.so.5
#5  0x000000080b2abbb9 in QThread::exec() () at /usr/local/lib/qt5/libQt5Core.so.5
#6  0x0000000808dab243 in  () at /usr/local/lib/qt5/libQt5DBus.so.5
#7  0x000000080b2acbb4 in  () at /usr/local/lib/qt5/libQt5Core.so.5
#8  0x000000080c05bc55 in thread_start (curthread=0x800719700) at /usr/src/lib/libthr/thread/thr_create.c:289
#9  0x0000000000000000 in  ()

Thread 1 (LWP 101889 of process 45924):
#1  0x000000080c05e64c in __thr_nanosleep (time_to_sleep=0x7fffffff9b50, time_remaining=0x7fffffff9b40) at /usr/src/lib/libthr/thread/thr_syscalls.c:287
#2  0x000000080c2e889b in __sleep (seconds=1) at /usr/src/lib/libc/gen/sleep.c:62
#3  0x0000000809554bfa in  () at /usr/local/lib/libKF5Crash.so.5
#4  0x000000080955433a in KCrash::defaultCrashHandler(int) () at /usr/local/lib/libKF5Crash.so.5
#5  0x000000080c0618c6 in handle_signal (actp=0x7fffffffd100, sig=11, info=0x7fffffffd4f0, ucp=0x7fffffffd180) at /usr/src/lib/libthr/thread/thr_sig.c:246
#6  0x000000080c060f0f in thr_sighandler (sig=11, info=0x7fffffffd4f0, _ucp=0x7fffffffd180) at /usr/src/lib/libthr/thread/thr_sig.c:189
#7  0x00007ffffffff003 in <signal handler called> ()
#8  0x0000000825cf7d9a in KWin::SceneOpenGL::createScene(QObject*) () at /usr/local/lib/qt5/plugins/org.kde.kwin.scenes/KWinSceneOpenGL.so
#9  0x0000000825d06c42 in KWin::OpenGLFactory::create(QObject*) const () at /usr/local/lib/qt5/plugins/org.kde.kwin.scenes/KWinSceneOpenGL.so
#10 0x0000000800dbed25 in KWin::Compositor::slotCompositingOptionsInitialized() () at /usr/local/lib/libkwin.so.5
#11 0x000000080b4af021 in QObject::event(QEvent*) () at /usr/local/lib/qt5/libQt5Core.so.5
#12 0x0000000809f79660 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/local/lib/qt5/libQt5Widgets.so.5
#13 0x0000000809f7ac26 in QApplication::notify(QObject*, QEvent*) () at /usr/local/lib/qt5/libQt5Widgets.so.5
#14 0x000000080b482d80 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/local/lib/qt5/libQt5Core.so.5
#15 0x000000080b483dd2 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/local/lib/qt5/libQt5Core.so.5
#16 0x000000080b4d8e68 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/local/lib/qt5/libQt5Core.so.5
#17 0x000000081b8b2ef4 in  () at /usr/local/lib/qt5/libQt5XcbQpa.so.5
#18 0x000000080b47e76e in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/local/lib/qt5/libQt5Core.so.5
#19 0x000000080b48343e in QCoreApplication::exec() () at /usr/local/lib/qt5/libQt5Core.so.5
#20 0x000000080082dbaf in kdemain () at /usr/local/lib/libkdeinit5_kwin_x11.so
#21 0x0000000000400bdf in  ()
#22 0x0000000800625000 in  ()
#23 0x0000000000000000 in  ()
[Inferior 1 (process 45924) detached]

Reported using DrKonqi
Comment 1 Vlad Zahorodnii 2019-09-18 07:31:57 UTC 
Unfortunately the backtrace lacks debug symbols. Please install kwin debug packages and submit a new backtrace once kwin has crashed again.
Comment 2 Bug Janitor Service 2019-10-03 04:33:09 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
mark the bug 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 3 Bug Janitor Service 2019-10-18 04:33:11 UTC 
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!