Application: kwin_x11 (5.11.95) Qt Version: 5.10.0 Frameworks Version: 5.42.0 Operating System: Linux 4.15.0-loonix x86_64 Distribution (Platform): Archlinux Packages -- Information about the crash: Pressing and holding alt-tab to switch between running programs crashes kwin_x11 when "Thumbnails" is selected as Task switcher. To reproduce the bug, keep pressed alt+tab to rapidly switch between running programs. 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 0x7fc923a2f840 (LWP 2066))] Thread 13 (Thread 0x7fc901b7d700 (LWP 30419)): #0 0x00007fc91c35d3bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007fc8f12d0fec in () at /usr/lib/dri/radeonsi_dri.so #2 0x00007fc8f12d0ef8 in () at /usr/lib/dri/radeonsi_dri.so #3 0x00007fc91c35708c in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007fc9233a5e7f in clone () at /usr/lib/libc.so.6 Thread 12 (Thread 0x7fc8c77fe700 (LWP 2144)): #0 0x00007fc91c35d3bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007fc91f63cf77 in () at /usr/lib/libQt5Script.so.5 #2 0x00007fc91f63cfb9 in () at /usr/lib/libQt5Script.so.5 #3 0x00007fc91c35708c in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007fc9233a5e7f in clone () at /usr/lib/libc.so.6 Thread 11 (Thread 0x7fc8e4b08700 (LWP 2141)): #0 0x00007fc91c35d3bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007fc8f12d0fec in () at /usr/lib/dri/radeonsi_dri.so #2 0x00007fc8f12d0ef8 in () at /usr/lib/dri/radeonsi_dri.so #3 0x00007fc91c35708c in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007fc9233a5e7f in clone () at /usr/lib/libc.so.6 Thread 10 (Thread 0x7fc8e5309700 (LWP 2140)): #0 0x00007fc91c35d3bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007fc8f12d0fec in () at /usr/lib/dri/radeonsi_dri.so #2 0x00007fc8f12d0ef8 in () at /usr/lib/dri/radeonsi_dri.so #3 0x00007fc91c35708c in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007fc9233a5e7f in clone () at /usr/lib/libc.so.6 Thread 9 (Thread 0x7fc8e5b0a700 (LWP 2139)): #0 0x00007fc91c35d3bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007fc8f12d0fec in () at /usr/lib/dri/radeonsi_dri.so #2 0x00007fc8f12d0ef8 in () at /usr/lib/dri/radeonsi_dri.so #3 0x00007fc91c35708c in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007fc9233a5e7f in clone () at /usr/lib/libc.so.6 Thread 8 (Thread 0x7fc8e630b700 (LWP 2138)): #0 0x00007fc91c35d3bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007fc8f12d0fec in () at /usr/lib/dri/radeonsi_dri.so #2 0x00007fc8f12d0ef8 in () at /usr/lib/dri/radeonsi_dri.so #3 0x00007fc91c35708c in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007fc9233a5e7f in clone () at /usr/lib/libc.so.6 Thread 7 (Thread 0x7fc8e6b0c700 (LWP 2137)): #0 0x00007fc91c35d3bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007fc8f12d0fec in () at /usr/lib/dri/radeonsi_dri.so #2 0x00007fc8f12d0ef8 in () at /usr/lib/dri/radeonsi_dri.so #3 0x00007fc91c35708c in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007fc9233a5e7f in clone () at /usr/lib/libc.so.6 Thread 6 (Thread 0x7fc8e730d700 (LWP 2136)): #0 0x00007fc91c35d3bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007fc8f12d0fec in () at /usr/lib/dri/radeonsi_dri.so #2 0x00007fc8f12d0ef8 in () at /usr/lib/dri/radeonsi_dri.so #3 0x00007fc91c35708c in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007fc9233a5e7f in clone () at /usr/lib/libc.so.6 Thread 5 (Thread 0x7fc8e7b0e700 (LWP 2135)): #0 0x00007fc91c35d3bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007fc8f12d0fec in () at /usr/lib/dri/radeonsi_dri.so #2 0x00007fc8f12d0ef8 in () at /usr/lib/dri/radeonsi_dri.so #3 0x00007fc91c35708c in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007fc9233a5e7f in clone () at /usr/lib/libc.so.6 Thread 4 (Thread 0x7fc8e830f700 (LWP 2134)): #0 0x00007fc91c35d3bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007fc8f12d0fec in () at /usr/lib/dri/radeonsi_dri.so #2 0x00007fc8f12d0ef8 in () at /usr/lib/dri/radeonsi_dri.so #3 0x00007fc91c35708c in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007fc9233a5e7f in clone () at /usr/lib/libc.so.6 Thread 3 (Thread 0x7fc900f17700 (LWP 2130)): #0 0x00007fc92339ba76 in ppoll () at /usr/lib/libc.so.6 #1 0x00007fc9207686f3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5 #2 0x00007fc920769e8f in QEventDispatcherUNIX::processEvents(QFlags) () at /usr/lib/libQt5Core.so.5 #3 0x00007fc92070ed0b in QEventLoop::exec(QFlags) () at /usr/lib/libQt5Core.so.5 #4 0x00007fc92051e78e in QThread::exec() () at /usr/lib/libQt5Core.so.5 #5 0x00007fc91ae28a19 in () at /usr/lib/libQt5Qml.so.5 #6 0x00007fc920523b2d in () at /usr/lib/libQt5Core.so.5 #7 0x00007fc91c35708c in start_thread () at /usr/lib/libpthread.so.0 #8 0x00007fc9233a5e7f in clone () at /usr/lib/libc.so.6 Thread 2 (Thread 0x7fc9033f8700 (LWP 2106)): #0 0x00007fc92339ba76 in ppoll () at /usr/lib/libc.so.6 #1 0x00007fc9207686f3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5 #2 0x00007fc920769e8f in QEventDispatcherUNIX::processEvents(QFlags) () at /usr/lib/libQt5Core.so.5 #3 0x00007fc92070ed0b in QEventLoop::exec(QFlags) () at /usr/lib/libQt5Core.so.5 #4 0x00007fc92051e78e in QThread::exec() () at /usr/lib/libQt5Core.so.5 #5 0x00007fc919cb1416 in () at /usr/lib/libQt5DBus.so.5 #6 0x00007fc920523b2d in () at /usr/lib/libQt5Core.so.5 #7 0x00007fc91c35708c in start_thread () at /usr/lib/libpthread.so.0 #8 0x00007fc9233a5e7f in clone () at /usr/lib/libc.so.6 Thread 1 (Thread 0x7fc923a2f840 (LWP 2066)): [KCrash Handler] #5 0x00007fc8f16ad836 in () at /usr/lib/dri/radeonsi_dri.so #6 0x00007fc8f16afbb3 in () at /usr/lib/dri/radeonsi_dri.so #7 0x00007fc8f140c613 in () at /usr/lib/dri/radeonsi_dri.so #8 0x00007fc8f140a6bf in () at /usr/lib/dri/radeonsi_dri.so #9 0x00007fc8f140ab65 in () at /usr/lib/dri/radeonsi_dri.so #10 0x00007fc8f120d6e7 in () at /usr/lib/dri/radeonsi_dri.so #11 0x00007fc8f136b37a in () at /usr/lib/dri/radeonsi_dri.so #12 0x00007fc8f2f76533 in () at /usr/lib/libGLX_mesa.so.0 #13 0x00007fc908c83165 in () at /usr/lib/qt/plugins/xcbglintegrations/libqxcb-glx-integration.so #14 0x00007fc920cbd38f in QOpenGLContext::swapBuffers(QSurface*) () at /usr/lib/libQt5Gui.so.5 #15 0x00007fc91b50a400 in () at /usr/lib/libQt5Quick.so.5 #16 0x00007fc91b587686 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5 #17 0x00007fc83b95ac64 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5 #18 0x00007fc92148ae3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5 #19 0x00007fc921492816 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5 #20 0x00007fc9207106c0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5 #21 0x00007fc920c8d7f3 in QWindowPrivate::deliverUpdateRequest() () at /usr/lib/libQt5Gui.so.5 #22 0x00007fc920c8dd2b in QWindow::event(QEvent*) () at /usr/lib/libQt5Gui.so.5 #23 0x00007fc91b587626 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5 #24 0x00007fc83b95ac64 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5 #25 0x00007fc92148ae3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5 #26 0x00007fc921492816 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5 #27 0x00007fc9207106c0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5 #28 0x00007fc92076bfb8 in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5 #29 0x00007fc92076a0f4 in QEventDispatcherUNIX::processEvents(QFlags) () at /usr/lib/libQt5Core.so.5 #30 0x00007fc90ac1058e in () at /usr/lib/libQt5XcbQpa.so.5 #31 0x00007fc92070ed0b in QEventLoop::exec(QFlags) () at /usr/lib/libQt5Core.so.5 #32 0x00007fc920717ff8 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5 #33 0x00007fc92366f719 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so #34 0x00007fc9232d0f4a in __libc_start_main () at /usr/lib/libc.so.6 #35 0x000055577d59876a in _start () Reported using DrKonqi