Bug 385421

Summary: Strange desktop behavior during Alt+Tab window switching (appears to freeze, crash after attempting to switch away from switch UI)
Product: [Plasma] kwin Reporter: Michael <mjevans1983>
Component: generalAssignee: 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/Implemented In:
Sentry Crash Report:

Description Michael 2017-10-06 00:54:48 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: "Arch Linux"

-- Information about the crash:
Occasionally (with seemingly no relation to system uptime/etc) 
Alt+Tab window switching
Makes the desktop unresponsive; it appears to freeze as it's constructing the application switch UI, and will crash, freeing the interface, after attempting to switch away from switch UI

I am using the binaries produced by the Arch Linux distribution and the open source drivers (amdgpu for a GCN 1.2 card).

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 0x7f5f04e01840 (LWP 854))]

Thread 14 (Thread 0x7f5eba7fc700 (LWP 3548)):
#0  0x00007f5efd95a38d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5ecf48d81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f5ecf48d728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f5efd95408a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f5f047a81bf in clone () at /usr/lib/libc.so.6

Thread 13 (Thread 0x7f5ee893f700 (LWP 749)):
#0  0x00007f5efd95a38d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5ecf48d81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f5ecf48d728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f5efd95408a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f5f047a81bf in clone () at /usr/lib/libc.so.6

Thread 12 (Thread 0x7f5eb9ffb700 (LWP 7080)):
#0  0x00007f5f01dc096b in  () at /usr/lib/libQt5Core.so.5
#1  0x00007f5f01dbf0ea in QTimerInfoList::updateCurrentTime() () at /usr/lib/libQt5Core.so.5
#2  0x00007f5f01dbf6c6 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/libQt5Core.so.5
#3  0x00007f5f01dbe635 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f5f01d64fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f5f01b7e3ee in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f5f01b8313b in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f5efd95408a in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f5f047a81bf in clone () at /usr/lib/libc.so.6

Thread 11 (Thread 0x7f5eb97fa700 (LWP 994)):
#0  0x00007f5efd95a38d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5f00cdcb04 in  () at /usr/lib/libQt5Script.so.5
#2  0x00007f5f00cdcb49 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007f5efd95408a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f5f047a81bf in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7f5ebaffd700 (LWP 983)):
#0  0x00007f5efd95a38d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5ecf48d81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f5ecf48d728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f5efd95408a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f5f047a81bf in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7f5ebb7fe700 (LWP 982)):
#0  0x00007f5efd95a38d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5ecf48d81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f5ecf48d728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f5efd95408a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f5f047a81bf in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7f5ebbfff700 (LWP 981)):
#0  0x00007f5efd95a38d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5ecf48d81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f5ecf48d728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f5efd95408a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f5f047a81bf in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7f5ec8eb0700 (LWP 980)):
#0  0x00007f5efd95a38d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5ecf48d81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f5ecf48d728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f5efd95408a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f5f047a81bf in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7f5ec96b1700 (LWP 979)):
#0  0x00007f5efd95a38d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5ecf48d81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f5ecf48d728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f5efd95408a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f5f047a81bf in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7f5eca0b7700 (LWP 978)):
#0  0x00007f5efd95a38d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5ecf48d81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f5ecf48d728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f5efd95408a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f5f047a81bf in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7f5eca9f9700 (LWP 977)):
#0  0x00007f5efd95a38d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f5ecf48d81c in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#2  0x00007f5ecf48d728 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#3  0x00007f5efd95408a in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f5f047a81bf in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7f5ee33ac700 (LWP 960)):
#0  0x00007f5f0479ddb6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f5f01dbcb83 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f5f01dbe31f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f5f01d64fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f5f01b7e3ee in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f5efc4523d9 in  () at /usr/lib/libQt5Qml.so.5
#6  0x00007f5f01b8313b in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f5efd95408a in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f5f047a81bf in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7f5ee978e700 (LWP 876)):
#0  0x00007f5f0479ddb6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007f5f01dbcb83 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5
#2  0x00007f5f01dbe31f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#3  0x00007f5f01d64fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f5f01b7e3ee in QThread::exec() () at /usr/lib/libQt5Core.so.5
#5  0x00007f5efb5f4376 in  () at /usr/lib/libQt5DBus.so.5
#6  0x00007f5f01b8313b in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f5efd95408a in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f5f047a81bf in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7f5f04e01840 (LWP 854)):
[KCrash Handler]
#5  0x00007f5ecf83b9c7 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#6  0x00007f5ecf5ada63 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#7  0x00007f5ecf5abb0f in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#8  0x00007f5ecf5abfb5 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#9  0x00007f5ecf3cc6b7 in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#10 0x00007f5ecf51072a in  () at /usr/lib/xorg/modules/dri/radeonsi_dri.so
#11 0x00007f5ee158847f in  () at /usr/lib/libGLX_mesa.so.0
#12 0x00007f5eea8ded15 in  () at /usr/lib/qt/plugins/xcbglintegrations/libqxcb-glx-integration.so
#13 0x00007f5f0230004f in QOpenGLContext::swapBuffers(QSurface*) () at /usr/lib/libQt5Gui.so.5
#14 0x00007f5efcb26160 in  () at /usr/lib/libQt5Quick.so.5
#15 0x00007f5efcb9c996 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#16 0x00007f5e1a1370d4 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5
#17 0x00007f5f02a82e2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#18 0x00007f5f02a8a906 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#19 0x00007f5f01d66bb0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#20 0x00007f5f022d1273 in QWindowPrivate::deliverUpdateRequest() () at /usr/lib/libQt5Gui.so.5
#21 0x00007f5f022d179b in QWindow::event(QEvent*) () at /usr/lib/libQt5Gui.so.5
#22 0x00007f5efcb9c936 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5
#23 0x00007f5e1a1370d4 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5
#24 0x00007f5f02a82e2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#25 0x00007f5f02a8a906 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#26 0x00007f5f01d66bb0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#27 0x00007f5f01dc0488 in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5
#28 0x00007f5f01dbe584 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#29 0x00007f5eeca470fe in  () at /usr/lib/libQt5XcbQpa.so.5
#30 0x00007f5f01d64fdb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#31 0x00007f5f01d6e028 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#32 0x00007f5f04a716d3 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#33 0x00007f5f046d2f6a in __libc_start_main () at /usr/lib/libc.so.6
#34 0x000055e8ea7857ca in _start ()

Reported using DrKonqi
Comment 1 Martin Flöser 2017-10-06 04:19:27 UTC 
Crash happens in the Radeon driver. Please report to Radeon developers.