Application: kwin_x11 (5.8.90)

Qt Version: 5.7.0
Frameworks Version: 5.30.0
Operating System: Linux 4.9.0-040900-generic x86_64
Distribution: KDE neon Developer Edition

-- Information about the crash:
I was testing wayland with the lates kernel 4.9.2, switched from kwin to xfwm4 (by running "dpkg-reconfigure xfwm4") to see if it magically solves some of the issues i am having.
I realized my mistakes.......

After rebooting and login to x11 session kwin crashed eventhough xfwm4 was running and working ok.

Also drkonqui said i was missing 2 debug packages, kwin_x11 and libQt5Core.
I have installed kwin-dbg, there is no "dbg" for the other. So i am not this is bactrace is good enough.

The crash can be reproduced sometimes.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
[Current thread is 1 (Thread 0x7f0b2c11a940 (LWP 1629))]

Thread 6 (Thread 0x7f0aeffff700 (LWP 1783)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f0b28c055c4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f0b28c05609 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f0b258886ba in start_thread (arg=0x7f0aeffff700) at pthread_create.c:333
#4  0x00007f0b2bc0f82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f0af8a48700 (LWP 1774)):
[KCrash Handler]
#6  0x00007f0b29907960 in QRingBuffer::chop(long long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f0b2998e12b in QIODevice::read(char*, long long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f0b2998e7ef in QIODevice::readAll() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f0b2b7e403b in KWin::Script::loadScriptFromFile (this=<optimized out>) at /workspace/build/scripting/scripting.cpp:468
#10 0x00007f0b2b7e5470 in QtConcurrent::StoredMemberFunctionPointerCall0<QByteArray, KWin::Script>::runFunctor (this=0x204ffa0) at /usr/include/x86_64-linux-gnu/qt5/QtConcurrent/qtconcurrentstoredfunctioncall.h:189
#11 QtConcurrent::RunFunctionTask<QByteArray>::run (this=0x204ffa0) at /usr/include/x86_64-linux-gnu/qt5/QtConcurrent/qtconcurrentrunbase.h:108
#12 0x00007f0b29884013 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f0b29887b98 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f0b258886ba in start_thread (arg=0x7f0af8a48700) at pthread_create.c:333
#15 0x00007f0b2bc0f82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f0b02f6e700 (LWP 1769)):
#0  0x00007f0b2bc03b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f0b29aae60a in qt_safe_poll(pollfd*, unsigned long, timespec const*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f0b29aafee8 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f0b29a5dcea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f0b29882fb4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f0b29887b98 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f0b258886ba in start_thread (arg=0x7f0b02f6e700) at pthread_create.c:333
#7  0x00007f0b2bc0f82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f0b12a38700 (LWP 1698)):
#0  0x00007fff4a97bb02 in clock_gettime ()
#1  0x00007f0b2bc1dc86 in __GI___clock_gettime (clock_id=1, tp=0x7f0b12a37aa0) at ../sysdeps/unix/clock_gettime.c:115
#2  0x00007f0b2992d1c1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f0b29ab0eb9 in QTimerInfoList::updateCurrentTime() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f0b29ab1425 in QTimerInfoList::timerWait(timespec&) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f0b29ab01b4 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f0b29a5dcea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f0b29882fb4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f0b2c2367a5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#9  0x00007f0b29887b98 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f0b258886ba in start_thread (arg=0x7f0b12a38700) at pthread_create.c:333
#11 0x00007f0b2bc0f82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f0b14558700 (LWP 1697)):
#0  0x00007f0b2bc03b5d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f0b2ad42c62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f0b2ad448d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f0b1521ca39 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f0b29887b98 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f0b258886ba in start_thread (arg=0x7f0b14558700) at pthread_create.c:333
#6  0x00007f0b2bc0f82d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f0b2c11a940 (LWP 1629)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f0b29888a4b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f0b29883765 in QThreadPoolPrivate::waitForDone(int) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f0b29883b61 in QThreadPool::waitForDone(int) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f0b29a61695 in QCoreApplication::~QCoreApplication() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f0b2a34c064 in QApplication::~QApplication() () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#6  0x00007f0b2bee08cd in KWin::ApplicationX11::~ApplicationX11 (this=0x7fff4a91ebc0, __in_chrg=<optimized out>) at /workspace/build/main_x11.cpp:187
#7  0x00007f0b2bee2191 in kdemain (argc=1, argv=0x7fff4a91ed48) at /workspace/build/main_x11.cpp:413
#8  0x00007f0b2bb29830 in __libc_start_main (main=0x400710 <main(int, char**)>, argc=1, argv=0x7fff4a91ed48, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff4a91ed38) at ../csu/libc-start.c:291
#9  0x0000000000400749 in _start ()

Possible duplicates by query: bug 373669, bug 373219, bug 371397.

Reported using DrKonqi