Bug 385481

Summary:	KWin segfaults on alt+tab in certain cases
Product:	[Plasma] kwin	Reporter:	Eliot Partridge <bytewave>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	crash	Keywords:	drkonqi
Priority:	NOR
Version First Reported In:	5.10.5
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Eliot Partridge 2017-10-08 01:22:22 UTC

Application: kwin_x11 (5.10.5)

Qt Version: 5.9.1
Frameworks Version: 5.38.0
Operating System: Linux 4.13.4-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

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

Simply pressing alt + tab then an additional tab to switch applications. Seems to occur when the alt + tab switcher is used too quickly (ie, as it's just fading in). Initial crash occured just as a Chrome window was being removed, but I'm not sure if that's entirely relevant---restarting kwin_x11 from a terminal and disowning the process to get it up and running again caused the same problem on alt + tabbing.

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f122895a840 (LWP 10423))]

Thread 16 (Thread 0x7f11bd8bd700 (LWP 10532)):
#0  0x00007f122142838d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f11f8f3e81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f11f8f3e728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 15 (Thread 0x7f11abe8e700 (LWP 10447)):
#0  0x00007f122142838d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f12247ebb04 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f12247ebb49 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 14 (Thread 0x7f11bd0bc700 (LWP 10445)):
#0  0x00007f122142838d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f11f8f3e81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f11f8f3e728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 13 (Thread 0x7f11ce7fc700 (LWP 10443)):
#0  0x00007f12282dedb6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f12258d8b83 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f12258da31f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f1225880fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f122569a3ee in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f121ff103d9 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f122569f13b in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 12 (Thread 0x7f11cf7fe700 (LWP 10441)):
#0  0x00007f122142838d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f11f8f3e81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f11f8f3e728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 11 (Thread 0x7f11cffff700 (LWP 10440)):
#0  0x00007f122142838d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f11f8f3e81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f11f8f3e728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7f11eccae700 (LWP 10439)):
#0  0x00007f122142838d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f11f8f3e81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f11f8f3e728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7f11ed4af700 (LWP 10438)):
#0  0x00007f122142838d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f11f8f3e81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f11f8f3e728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f11edcb0700 (LWP 10437)):
#0  0x00007f122142838d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f11f8f3e81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f11f8f3e728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f11ee4b1700 (LWP 10436)):
#0  0x00007f122142838d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f11f8f3e81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f11f8f3e728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f11eecb2700 (LWP 10435)):
#0  0x00007f122142838d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f11f8f3e81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f11f8f3e728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f11ef6b9700 (LWP 10434)):
#0  0x00007f122142838d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f11f8f3e81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f11f8f3e728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f11efeba700 (LWP 10433)):
#0  0x00007f122142838d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f11f8f3e81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f11f8f3e728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f1206c60700 (LWP 10432)):
#0  0x00007f12282dedb6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f12258d8b83 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f12258da31f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f1225880fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f122569a3ee in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f121ff103d9 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f122569f13b in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f120d112700 (LWP 10430)):
#0  0x00007f12258da2c1 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#1  0x00007f1225880fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#2  0x00007f122569a3ee in QThread::exec() () at /usr/lib/libQt5Core.so.5
#3  0x00007f121f09f376 in  () at /usr/lib/libQt5DBus.so.5
#4  0x00007f122569f13b in  () at /usr/lib/libQt5Core.so.5
#5  0x00007f122142208a in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007f12282e91bf in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f122895a840 (LWP 10423)):
[KCrash Handler]
#5  0x00007f11f92ec9c7 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#6  0x00007f11f905ea63 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#7  0x00007f11f905cb0f in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#8  0x00007f11f905cfb5 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#9  0x00007f11f8e7d6b7 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#10 0x00007f11f8fc172a in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#11 0x00007f11fab7a47f in  () at /usr/lib/libGLX_mesa.so.0
#12 0x00007f120e282d15 in  () at /usr/lib/qt/plugins/xcbglintegrations/libqxcb-glx-integration.so
#13 0x00007f1225e2304f in QOpenGLContext::swapBuffers(QSurface*) () at /usr/lib/libQt5Gui.so.5
#14 0x00007f12205e8160 in  () at /usr/lib/libQt5Quick.so.5
#15 0x00007f122065e996 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#16 0x00007f1204f5a0d4 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5
#17 0x00007f12265a6e2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#18 0x00007f12265ae906 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#19 0x00007f1225882bb0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#20 0x00007f1225df4273 in QWindowPrivate::deliverUpdateRequest() () at /usr/lib/libQt5Gui.so.5
#21 0x00007f1225df479b in QWindow::event(QEvent*) () at /usr/lib/libQt5Gui.so.5
#22 0x00007f122065e936 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#23 0x00007f1204f5a0d4 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5
#24 0x00007f12265a6e2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#25 0x00007f12265ae906 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#26 0x00007f1225882bb0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#27 0x00007f12258dc488 in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#28 0x00007f12258da584 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#29 0x00007f12104150fe in  () at /usr/lib/libQt5XcbQpa.so.5
#30 0x00007f1225880fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#31 0x00007f122588a028 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#32 0x00007f12285b36d3 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#33 0x00007f1228213f6a in __libc_start_main () at /usr/lib/libc.so.6
#34 0x0000562cdd1567ca in _start ()

Reported using DrKonqi

Comment 1 Martin Flöser 2017-10-08 06:10:45 UTC

Crash in the Radeon driver. Please report to Radeon developers.