Application: kwin_x11 (5.13.5)

Qt Version: 5.11.1
Frameworks Version: 5.50.0
Operating System: Linux 4.18.0-11-generic x86_64
Distribution: Ubuntu 18.10

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

I was trying to apply a new window decoration theme (BreezeBlurred) and the last step was to use kwin_x11 --replace & to refresh it so that the new theme would appear in the Window Decorations menu. Later I repeated the same command independently of the theme installation and this error was still outputted.

- Unusual behavior I noticed:

The console outputted this:

Icon theme "papirus" not found.
Invalid Context= "stock" line for icon theme:  "/usr/share/icons/ubuntu-mono-dark/stock/16/"
Invalid Context= "stock" line for icon theme:  "/usr/share/icons/ubuntu-mono-dark/stock/22/"
Invalid Context= "stock" line for icon theme:  "/usr/share/icons/ubuntu-mono-dark/stock/24/"
Invalid Context= "stock" line for icon theme:  "/usr/share/icons/ubuntu-mono-dark/stock/32/"
Invalid Context= "stock" line for icon theme:  "/usr/share/icons/ubuntu-mono-dark/stock/48/"
Invalid Context= "stock" line for icon theme:  "/usr/share/icons/ubuntu-mono-dark/stock/64/"
Invalid Context= "stock" line for icon theme:  "/usr/share/icons/ubuntu-mono-dark/stock/128/"
Module 'org.kde.kwin.decoration' does not contain a module identifier directive - it cannot be protected from external registrations.
The X11 connection broke (error 1). Did the X11 server die?

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fdaa047e840 (LWP 2295))]

Thread 7 (Thread 0x7fd9f2f3a700 (LWP 16322)):
#0  0x00007fdaaaa697d6 in __GI_ppoll (fds=0x7fd9ec025aa8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007fdaa960a141 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fdaa960b5b9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fdaa95bb16b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fdaa940a0b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fdaa7a751f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007fdaa9413c87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fdaa8244164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007fdaaaa75def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fda81c4c700 (LWP 2489)):
#0  0x00007fdaa824a2eb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7fdaa9027fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fdaa824a2eb in __pthread_cond_wait_common (abstime=0x0, mutex=0x7fdaa9027f68, cond=0x7fdaa9027f90) at pthread_cond_wait.c:502
#2  0x00007fdaa824a2eb in __pthread_cond_wait (cond=0x7fdaa9027f90, mutex=0x7fdaa9027f68) at pthread_cond_wait.c:655
#3  0x00007fdaa8f30e2a in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007fdaa8f30e49 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007fdaa8244164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007fdaaaa75def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fda83fff700 (LWP 2364)):
#0  0x00007fdaa824a2eb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5588b84f6668) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fdaa824a2eb in __pthread_cond_wait_common (abstime=0x0, mutex=0x5588b84f6618, cond=0x5588b84f6640) at pthread_cond_wait.c:502
#2  0x00007fdaa824a2eb in __pthread_cond_wait (cond=0x5588b84f6640, mutex=0x5588b84f6618) at pthread_cond_wait.c:655
#3  0x00007fda9489746b in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007fda948971d7 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007fdaa8244164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007fdaaaa75def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fda96dee700 (LWP 2356)):
#0  0x00007fdaaaa697d6 in __GI_ppoll (fds=0x7fda84000d28, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007fdaa960a141 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fdaa960b5b9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fdaa95bb16b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fdaa940a0b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fdaa7a751f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007fdaa9413c87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fdaa8244164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007fdaaaa75def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fda9cc0c700 (LWP 2333)):
#0  0x00007fdaaaa697d6 in __GI_ppoll (fds=0x7fda9000b598, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007fdaa960a141 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fdaa960b5b9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fdaa95bb16b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fdaa940a0b6 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fdaa7559545 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007fdaa9413c87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fdaa8244164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#8  0x00007fdaaaa75def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fda9f8cf700 (LWP 2328)):
#0  0x00007fdaaaa696d9 in __GI___poll (fds=0x7fda9f8cec78, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fdaaa56e917 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fdaaa57053a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fda9fdb6159 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fdaa9413c87 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fdaa8244164 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007fdaaaa75def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fdaa047e840 (LWP 2295)):
[KCrash Handler]
#6  0x00007fdaaa99c077 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#7  0x00007fdaaa97d535 in __GI_abort () at abort.c:79
#8  0x00007fdaaa97d40f in __assert_fail_base (fmt=0x7fdaaab09858 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x7fdaa8163808 "0 && \"Couldn't find current GLX or EGL context.\\n\"", file=0x7fdaa8163760 "../src/dispatch_common.c", line=863, function=<optimized out>) at assert.c:92
#9  0x00007fdaaa98d142 in __GI___assert_fail (assertion=0x7fdaa8163808 "0 && \"Couldn't find current GLX or EGL context.\\n\"", file=0x7fdaa8163760 "../src/dispatch_common.c", line=863, function=0x7fdaa8163840 "epoxy_get_proc_address") at assert.c:101
#10 0x00007fdaa813e43f in  () at /usr/lib/x86_64-linux-gnu/libepoxy.so.0
#11 0x00007fdaa811404a in  () at /usr/lib/x86_64-linux-gnu/libepoxy.so.0
#12 0x00007fdaa90b27ca in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#13 0x00007fdaa90b2883 in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#14 0x00007fdaa90af5c6 in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#15 0x00007fdaa90af7a9 in  () at /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#16 0x00007fdaaa7e65ea in KWin::EffectsHandlerImpl::unloadAllEffects() () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#17 0x00007fdaaa7e6687 in KWin::EffectsHandlerImpl::~EffectsHandlerImpl() () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#18 0x00007fda9ce66118 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#19 0x00007fda9ce661e9 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#20 0x00007fdaaa7c7b8f in  () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#21 0x00007fdaaa7c7f0f in KWin::Compositor::~Compositor() () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#22 0x00007fdaaa7c7fa9 in KWin::Compositor::~Compositor() () at /usr/lib/x86_64-linux-gnu/libkwin.so.5
#23 0x00007fdaaab4d91c in  () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#24 0x00007fdaa95e56db in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007fdaaa4a44bb in KSelectionOwner::filterEvent(void*) () at /usr/lib/x86_64-linux-gnu/libKF5WindowSystem.so.5
#26 0x00007fdaa95b9fef in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007fda9fdb78f0 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#28 0x00007fda9fdb84b3 in QXcbConnection::processXcbEvents() () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#29 0x00007fdaa95e5f92 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007fdaa9f7d4a1 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007fdaa9f84ae0 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#32 0x00007fdaa95bc499 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007fdaa95bf48b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x00007fdaa960b42b in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#35 0x00007fda9fe480ed in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#36 0x00007fdaa95bb16b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#37 0x00007fdaa95c32e2 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#38 0x00007fdaaab4f47b in kdemain () at /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#39 0x00007fdaaa97f09b in __libc_start_main (main=0x5588b7710050, argc=3, argv=0x7fffad349168, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffad349158) at ../csu/libc-start.c:308
#40 0x00005588b771008a in _start ()
[Inferior 1 (process 2295) detached]

Possible duplicates by query: bug 400358, bug 400170, bug 399644, bug 399344, bug 396830.

Reported using DrKonqi