Application: kwin_x11 (5.10.4) Qt Version: 5.9.1 Frameworks Version: 5.36.0 Operating System: Linux 4.12.3-1-ARCH x86_64 Distribution (Platform): Archlinux Packages -- Information about the crash: - What I was doing when the application crashed: I was alt-tabbing between applications (with the "thumbnail" alt-tab style, not sure I translate this word correctly here). I released the Alt+tab keys, but the "thumbnails" remained on the screen for a few seconds, then kwin crashed. It happens from time to time, it's quite hard to reproduce. 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 0x7f618aea4840 (LWP 578))] Thread 11 (Thread 0x7f614b427700 (LWP 681)): #0 0x00007f61839cf1ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007f6186d5db04 in () at /usr/lib/libQt5Script.so.5 #2 0x00007f6186d5db49 in () at /usr/lib/libQt5Script.so.5 #3 0x00007f61839c9049 in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007f618a837f0f in clone () at /usr/lib/libc.so.6 Thread 10 (Thread 0x7f614c429700 (LWP 679)): #0 0x00007f61839cf1ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007f615752050c in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #2 0x00007f6157520218 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #3 0x00007f61839c9049 in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007f618a837f0f in clone () at /usr/lib/libc.so.6 Thread 9 (Thread 0x7f614cc2a700 (LWP 678)): #0 0x00007f61839cf1ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007f615752050c in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #2 0x00007f6157520218 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #3 0x00007f61839c9049 in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007f618a837f0f in clone () at /usr/lib/libc.so.6 Thread 8 (Thread 0x7f6154d27700 (LWP 677)): #0 0x00007f61839cf1ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007f615752050c in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #2 0x00007f6157520218 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #3 0x00007f61839c9049 in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007f618a837f0f in clone () at /usr/lib/libc.so.6 Thread 7 (Thread 0x7f6155528700 (LWP 676)): #0 0x00007f61839cf1ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007f615752050c in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #2 0x00007f6157520218 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #3 0x00007f61839c9049 in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007f618a837f0f in clone () at /usr/lib/libc.so.6 Thread 6 (Thread 0x7f6155f2e700 (LWP 675)): #0 0x00007f61839cf1ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007f615752050c in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #2 0x00007f6157520218 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #3 0x00007f61839c9049 in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007f618a837f0f in clone () at /usr/lib/libc.so.6 Thread 5 (Thread 0x7f615672f700 (LWP 674)): #0 0x00007f61839cf1ad in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0 #1 0x00007f615752050c in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #2 0x00007f6157520218 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #3 0x00007f61839c9049 in start_thread () at /usr/lib/libpthread.so.0 #4 0x00007f618a837f0f in clone () at /usr/lib/libc.so.6 Thread 4 (Thread 0x7f6163576700 (LWP 661)): #0 0x00007f618a82df76 in ppoll () at /usr/lib/libc.so.6 #1 0x00007f6187e3eba3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5 #2 0x00007f6187e4033f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5 #3 0x00007f6187de6ffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5 #4 0x00007f6187c0040e in QThread::exec() () at /usr/lib/libQt5Core.so.5 #5 0x00007f61824cb1d5 in () at /usr/lib/libQt5Qml.so.5 #6 0x00007f6187c0515b in () at /usr/lib/libQt5Core.so.5 #7 0x00007f61839c9049 in start_thread () at /usr/lib/libpthread.so.0 #8 0x00007f618a837f0f in clone () at /usr/lib/libc.so.6 Thread 3 (Thread 0x7f616aca4700 (LWP 616)): #0 0x00007f618a82df76 in ppoll () at /usr/lib/libc.so.6 #1 0x00007f6187e3eba3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/libQt5Core.so.5 #2 0x00007f6187e4033f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5 #3 0x00007f6187de6ffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5 #4 0x00007f6187c0040e in QThread::exec() () at /usr/lib/libQt5Core.so.5 #5 0x00007f618166c396 in () at /usr/lib/libQt5DBus.so.5 #6 0x00007f6187c0515b in () at /usr/lib/libQt5Core.so.5 #7 0x00007f61839c9049 in start_thread () at /usr/lib/libpthread.so.0 #8 0x00007f618a837f0f in clone () at /usr/lib/libc.so.6 Thread 2 (Thread 0x7f6170fb6700 (LWP 599)): #0 0x00007f618a82de9d in poll () at /usr/lib/libc.so.6 #1 0x00007f618991a8e0 in () at /usr/lib/libxcb.so.1 #2 0x00007f618991c679 in xcb_wait_for_event () at /usr/lib/libxcb.so.1 #3 0x00007f617209672a in () at /usr/lib/libQt5XcbQpa.so.5 #4 0x00007f6187c0515b in () at /usr/lib/libQt5Core.so.5 #5 0x00007f61839c9049 in start_thread () at /usr/lib/libpthread.so.0 #6 0x00007f618a837f0f in clone () at /usr/lib/libc.so.6 Thread 1 (Thread 0x7f618aea4840 (LWP 578)): [KCrash Handler] #5 0x00007f61578bbfa0 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #6 0x00007f615763a582 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #7 0x00007f615742a961 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #8 0x00007f61573ef6b0 in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #9 0x00007f61573efb4a in () at /usr/lib/xorg/modules/dri/radeonsi_dri.so #10 0x00007f6182b7e39f in QSGBatchRenderer::Renderer::renderMergedBatch(QSGBatchRenderer::Batch const*) () at /usr/lib/libQt5Quick.so.5 #11 0x00007f6182b7f5e5 in QSGBatchRenderer::Renderer::renderBatches() () at /usr/lib/libQt5Quick.so.5 #12 0x00007f6182b84d44 in QSGBatchRenderer::Renderer::render() () at /usr/lib/libQt5Quick.so.5 #13 0x00007f6182b756ed in QSGRenderer::renderScene(QSGBindable const&) () at /usr/lib/libQt5Quick.so.5 #14 0x00007f6182b75bab in QSGRenderer::renderScene(unsigned int) () at /usr/lib/libQt5Quick.so.5 #15 0x00007f6182baff50 in QSGDefaultRenderContext::renderNextFrame(QSGRenderer*, unsigned int) () at /usr/lib/libQt5Quick.so.5 #16 0x00007f6182c0c948 in QQuickWindowPrivate::renderSceneGraph(QSize const&) () at /usr/lib/libQt5Quick.so.5 #17 0x00007f6182ba23a9 in () at /usr/lib/libQt5Quick.so.5 #18 0x00007f6182c16bd6 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5 #19 0x00007f6132b46ba4 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5 #20 0x00007f6188b0fe4c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5 #21 0x00007f6188b17926 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5 #22 0x00007f6187de8bd0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5 #23 0x00007f6188357293 in QWindowPrivate::deliverUpdateRequest() () at /usr/lib/libQt5Gui.so.5 #24 0x00007f61883577bb in QWindow::event(QEvent*) () at /usr/lib/libQt5Gui.so.5 #25 0x00007f6182c16b75 in QQuickWindow::event(QEvent*) () at /usr/lib/libQt5Quick.so.5 #26 0x00007f6132b46ba4 in PlasmaQuick::Dialog::event(QEvent*) () at /usr/lib/libKF5PlasmaQuick.so.5 #27 0x00007f6188b0fe4c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5 #28 0x00007f6188b17926 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5 #29 0x00007f6187de8bd0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5 #30 0x00007f6187e424a8 in QTimerInfoList::activateTimers() () at /usr/lib/libQt5Core.so.5 #31 0x00007f6187e405a4 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5 #32 0x00007f61720fb0de in () at /usr/lib/libQt5XcbQpa.so.5 #33 0x00007f6187de6ffb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5 #34 0x00007f6187df0048 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5 #35 0x00007f618aaf86d3 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so #36 0x00007f618a76a4ca in __libc_start_main () at /usr/lib/libc.so.6 #37 0x0000009a950d57ca in _start () Reported using DrKonqi
I didn't have this problem when I was using an nvidia discrete GPU, or intel graphics. It happens since I switched to an AMD discrete GPU.
(In reply to Yannick from comment #1) > I didn't have this problem when I was using an nvidia discrete GPU, or intel > graphics. > It happens since I switched to an AMD discrete GPU. Unfortunately I can confirm that from the backtrace: the crash is in the driver. Sorry, nothing we can do :-(
Ok, no problem :> Hopefully, Mesa 17.2 will fix it. In the meantime, setting the Alt+Tab style to "large icons" (with no thumbnail at all) looks like a good workaround.