Bug 427282

Application: kwin_x11 (5.18.5)

Qt Version: 5.12.8
Frameworks Version: 5.68.0
Operating System: Linux 5.4.0-48-generic x86_64
Windowing system: X11
Distribution: Ubuntu 20.04.1 LTS

-- Information about the crash:
- What I was doing when the application crashed:
juste loggin after boot


- Unusual behavior I noticed:
screen freeze, logging animation stop or black screen
devices seem to be unresponsive ,can't use keybord to go tty's.
sometimes if i wait a few i can reach my computer by ssh, but must of time no ping reply.


- Custom settings of the application:
I have install and uninstall proprietary graphical driver (amd) and rocm
screen resollution change : logging 3840x720, desktop 1920x1080

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f73d890d0c0 (LWP 1561))]

Thread 4 (Thread 0x7f73c7bff700 (LWP 1696)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f73dda80fb8) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7f73dda80f68, cond=0x7f73dda80f90) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x7f73dda80f90, mutex=0x7f73dda80f68) at pthread_cond_wait.c:638
#3  0x00007f73dd9835fa in  () at /lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007f73dd98361f in  () at /lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007f73df593609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f73df6cf293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f73d51ff700 (LWP 1693)):
#0  0x00007f73df6c2bf6 in __ppoll (fds=0x7f73c0000d68, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:44
#1  0x00007f73de0954a9 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f73de096a14 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f73de0404db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f73dde78785 in QThread::exec() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f73dcbcc1a9 in  () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007f73dde799d2 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f73df593609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#8  0x00007f73df6cf293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f73d73fb700 (LWP 1627)):
#0  0x00007f73df6c2bf6 in __ppoll (fds=0x7f73c800ecb8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:44
#1  0x00007f73de0954a9 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f73de096a14 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f73de0404db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f73dde78785 in QThread::exec() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f73df0aaefa in  () at /lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007f73dde799d2 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f73df593609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#8  0x00007f73df6cf293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f73d890d0c0 (LWP 1561)):
[KCrash Handler]
#5  0x00007f73dd5aba34 in xcb_render_query_pict_formats_formats_iterator () at /lib/x86_64-linux-gnu/libxcb-render.so.0
#6  0x00007f73dd5aba6d in xcb_render_query_pict_formats_screens_iterator () at /lib/x86_64-linux-gnu/libxcb-render.so.0
#7  0x00007f73db9d61df in  () at /lib/x86_64-linux-gnu/libkwinxrenderutils.so.12
#8  0x00007f73db9d581c in KWin::XRenderUtils::findPictFormat(unsigned int) () at /lib/x86_64-linux-gnu/libkwinxrenderutils.so.12
#9  0x00007f73d422cb83 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.scenes/KWinSceneXRender.so
#10 0x00007f73d422d2a1 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.scenes/KWinSceneXRender.so
#11 0x00007f73d422ddee in KWin::XRenderFactory::create(QObject*) const () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.scenes/KWinSceneXRender.so
#12 0x00007f73df32a373 in  () at /lib/x86_64-linux-gnu/libkwin.so.5
#13 0x00007f73df32b5a6 in KWin::X11Compositor::start() () at /lib/x86_64-linux-gnu/libkwin.so.5
#14 0x00007f73de07a5b6 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f73de06dcf5 in QObject::event(QEvent*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007f73dea59a66 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007f73dea630f0 in QApplication::notify(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007f73de04193a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007f73de0988b0 in QTimerInfoList::activateTimers() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f73de096b6f in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f73d84da6e2 in  () at /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#22 0x00007f73de0404db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007f73de048246 in QCoreApplication::exec() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007f73df7a89ef in kdemain () at /lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#25 0x00007f73df5d40b3 in __libc_start_main (main=0x5624d00e5060, argc=1, argv=0x7fff1c976ae8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff1c976ad8) at ../csu/libc-start.c:308
#26 0x00005624d00e509e in _start ()
[Inferior 1 (process 1561) detached]

Reported using DrKonqi