Bug 392821

Application: kwin_x11 (5.8.9)

Qt Version: 5.6.1
Frameworks Version: 5.36.0
Operating System: Linux 4.13.0-38-generic x86_64
Distribution: Linux Mint 18.3 Sylvia

-- Information about the crash:
- What I was doing when the application crashed:
errore all'avvio del sistema operativo
- Unusual behavior I noticed:

scompaiono gli effetti grafici

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".
pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
[Current thread is 1 (Thread 0x7fdfa8b2c940 (LWP 2854))]

Thread 8 (Thread 0x7fdf86d31700 (LWP 3645)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fdfbd617574 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007fdfbd6175b9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007fdfba2ef6ba in start_thread (arg=0x7fdf86d31700) at pthread_create.c:333
#4  0x00007fdfc063f41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7fdf88103700 (LWP 3452)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fdf9d46f48b in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#2  0x00007fdf9d46f397 in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#3  0x00007fdfba2ef6ba in start_thread (arg=0x7fdf88103700) at pthread_create.c:333
#4  0x00007fdfc063f41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7fdf88a45700 (LWP 3451)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fdf9d46f48b in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#2  0x00007fdf9d46f397 in ?? () from /usr/lib/x86_64-linux-gnu/dri/r600_dri.so
#3  0x00007fdfba2ef6ba in start_thread (arg=0x7fdf88a45700) at pthread_create.c:333
#4  0x00007fdfc063f41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fdf9e79d700 (LWP 3449)):
[KCrash Handler]
#6  _mm_loadu_si128(long long __vector(2) const*) (__P=<optimized out>) at /usr/lib/gcc/x86_64-linux-gnu/5/include/emmintrin.h:698
#7  simdEncodeAscii (end=<optimized out>, src=<optimized out>, nextAscii=<optimized out>, dst=<optimized out>) at codecs/qutfcodec.cpp:55
#8  QUtf8::convertFromUnicode (uc=0xffbf807be528, len=<optimized out>, state=0x0) at codecs/qutfcodec.cpp:212
#9  0x00007fdfbe4af485 in QUtf8Codec::convertFromUnicode (this=<optimized out>, uc=<optimized out>, len=<optimized out>, state=<optimized out>) at codecs/qutfcodec.cpp:662
#10 0x00007fdfbe30f8b1 in QTextCodec::fromUnicode (state=0x0, length=32735, in=0xffbf807be528, this=<optimized out>) at ../../include/QtCore/../../src/corelib/codecs/qtextcodec.h:105
#11 QString::toLocal8Bit_helper (data=0xffbf807be528, size=32735) at tools/qstring.cpp:4572
#12 0x00007fdfbe3e541f in QString::toLocal8Bit() const & (this=0x16fe870) at ../../include/QtCore/../../src/corelib/tools/qstring.h:517
#13 QFile::encodeName (fileName=...) at ../../include/QtCore/../../src/corelib/io/qfile.h:82
#14 QLockFilePrivate::tryLock_sys (this=this@entry=0x16fe870) at io/qlockfile_unix.cpp:180
#15 0x00007fdfbe382a80 in QLockFile::tryLock (this=<optimized out>, timeout=-1) at io/qlockfile.cpp:212
#16 0x00007fdfbf9e0f79 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5ConfigCore.so.5
#17 0x00007fdfbf9cb187 in KConfig::sync() () from /usr/lib/x86_64-linux-gnu/libKF5ConfigCore.so.5
#18 0x00007fdfa5698175 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/org.kde.kwin.platforms/KWinX11Platform.so
#19 0x00007fdfbe47fc24 in QtPrivate::QSlotObjectBase::call (a=0x7fdf9e79c830, r=0x1546040, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#20 QMetaObject::activate (sender=sender@entry=0x1546040, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3715
#21 0x00007fdfbe4801b7 in QMetaObject::activate (sender=sender@entry=0x1546040, m=m@entry=0x7fdfbe69b720 <QTimer::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3595
#22 0x00007fdfbe4fae80 in QTimer::timeout (this=this@entry=0x1546040) at .moc/moc_qtimer.cpp:198
#23 0x00007fdfbe48c0b8 in QTimer::timerEvent (this=0x1546040, e=<optimized out>) at kernel/qtimer.cpp:247
#24 0x00007fdfbe4806d3 in QObject::event (this=0x1546040, e=<optimized out>) at kernel/qobject.cpp:1278
#25 0x00007fdfbed88afc in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x1546040, e=0x7fdf9e79cb40) at kernel/qapplication.cpp:3804
#26 0x00007fdfbed8e036 in QApplication::notify (this=0x7ffcc7f14d80, receiver=0x1546040, e=0x7fdf9e79cb40) at kernel/qapplication.cpp:3561
#27 0x00007fdfbe4532a8 in QCoreApplication::notifyInternal2 (receiver=0x1546040, event=event@entry=0x7fdf9e79cb40) at kernel/qcoreapplication.cpp:1015
#28 0x00007fdfbe4a724e in QCoreApplication::sendEvent (event=0x7fdf9e79cb40, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:225
#29 QTimerInfoList::activateTimers (this=0x7fdf90001118) at kernel/qtimerinfo_unix.cpp:637
#30 0x00007fdfbe4a5060 in QEventDispatcherUNIX::activateTimers (this=this@entry=0x7fdf900008c0) at kernel/qeventdispatcher_unix.cpp:549
#31 0x00007fdfbe4a5b04 in QEventDispatcherUNIX::processEvents (this=0x7fdf900008c0, flags=...) at kernel/qeventdispatcher_unix.cpp:611
#32 0x00007fdfbe450ffa in QEventLoop::exec (this=this@entry=0x7fdf9e79cc80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#33 0x00007fdfbe2799e4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:500
#34 0x00007fdfbe27e808 in QThreadPrivate::start (arg=0x1546550) at thread/qthread_unix.cpp:341
#35 0x00007fdfba2ef6ba in start_thread (arg=0x7fdf9e79d700) at pthread_create.c:333
#36 0x00007fdfc063f41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fdf9f7fe700 (LWP 3430)):
#0  0x00007fdfc06355d3 in select () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fdfbe4a3bcf in qt_safe_select (nfds=13, fdread=fdread@entry=0x7fdf8c000a78, fdwrite=fdwrite@entry=0x7fdf8c000d08, fdexcept=fdexcept@entry=0x7fdf8c000f98, orig_timeout=orig_timeout@entry=0x0) at kernel/qcore_unix.cpp:75
#2  0x00007fdfbe4a560e in QEventDispatcherUNIX::select (timeout=0x0, exceptfds=0x7fdf8c000f98, writefds=0x7fdf8c000d08, readfds=0x7fdf8c000a78, nfds=<optimized out>, this=0x7fdf8c0008c0) at kernel/qeventdispatcher_unix.cpp:320
#3  QEventDispatcherUNIXPrivate::doSelect (this=this@entry=0x7fdf8c0008e0, flags=..., flags@entry=..., timeout=timeout@entry=0x0) at kernel/qeventdispatcher_unix.cpp:196
#4  0x00007fdfbe4a5b22 in QEventDispatcherUNIX::processEvents (this=0x7fdf8c0008c0, flags=...) at kernel/qeventdispatcher_unix.cpp:607
#5  0x00007fdfbe450ffa in QEventLoop::exec (this=this@entry=0x7fdf9f7fdc60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fdfbe2799e4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:500
#7  0x00007fdfb94496b5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fdfbe27e808 in QThreadPrivate::start (arg=0x15578c0) at thread/qthread_unix.cpp:341
#9  0x00007fdfba2ef6ba in start_thread (arg=0x7fdf9f7fe700) at pthread_create.c:333
#10 0x00007fdfc063f41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fdfa60c6700 (LWP 3289)):
#0  0x00007fdfc06355d3 in select () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fdfbe4a3bcf in qt_safe_select (nfds=8, fdread=fdread@entry=0x7fdf98000a78, fdwrite=fdwrite@entry=0x7fdf98000d08, fdexcept=fdexcept@entry=0x7fdf98000f98, orig_timeout=orig_timeout@entry=0x0) at kernel/qcore_unix.cpp:75
#2  0x00007fdfbe4a560e in QEventDispatcherUNIX::select (timeout=0x0, exceptfds=0x7fdf98000f98, writefds=0x7fdf98000d08, readfds=0x7fdf98000a78, nfds=<optimized out>, this=0x7fdf980008c0) at kernel/qeventdispatcher_unix.cpp:320
#3  QEventDispatcherUNIXPrivate::doSelect (this=this@entry=0x7fdf980008e0, flags=..., flags@entry=..., timeout=timeout@entry=0x0) at kernel/qeventdispatcher_unix.cpp:196
#4  0x00007fdfbe4a5b22 in QEventDispatcherUNIX::processEvents (this=0x7fdf980008c0, flags=...) at kernel/qeventdispatcher_unix.cpp:607
#5  0x00007fdfbe450ffa in QEventLoop::exec (this=this@entry=0x7fdfa60c5c50, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fdfbe2799e4 in QThread::exec (this=this@entry=0x7fdfc0cc7d40 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:500
#7  0x00007fdfc0c54515 in QDBusConnectionManager::run (this=0x7fdfc0cc7d40 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:189
#8  0x00007fdfbe27e808 in QThreadPrivate::start (arg=0x7fdfc0cc7d40 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:341
#9  0x00007fdfba2ef6ba in start_thread (arg=0x7fdfa60c6700) at pthread_create.c:333
#10 0x00007fdfc063f41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fdfa7c06700 (LWP 3285)):
#0  0x00007fdfc063374d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fdfbf798c62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fdfbf79a8d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fdfa88b3d29 in QXcbEventReader::run (this=0x1382670) at qxcbconnection.cpp:1325
#4  0x00007fdfbe27e808 in QThreadPrivate::start (arg=0x1382670) at thread/qthread_unix.cpp:341
#5  0x00007fdfba2ef6ba in start_thread (arg=0x7fdfa7c06700) at pthread_create.c:333
#6  0x00007fdfc063f41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fdfa8b2c940 (LWP 2854)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fdfbf798eb9 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fdfbf79a617 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fdfbf79a721 in xcb_wait_for_reply () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#4  0x00007fdfc01f244b in ?? () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#5  0x00007fdfc01f5944 in ?? () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#6  0x00007fdfbd748a72 in ?? () from /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#7  0x00007fdfbd74a90f in ?? () from /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#8  0x00007fdfbd748146 in ?? () from /usr/lib/x86_64-linux-gnu/libkwin4_effect_builtins.so.1
#9  0x00007fdfc0202fc0 in ?? () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#10 0x00007fdfc02034ff in ?? () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#11 0x00007fdfc0208b4f in ?? () from /usr/lib/x86_64-linux-gnu/libkwin.so.5
#12 0x00007fdfbe480719 in QObject::event (this=0x1755420, e=<optimized out>) at kernel/qobject.cpp:1256
#13 0x00007fdfbed88afc in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x1755420, e=0x175aa30) at kernel/qapplication.cpp:3804
#14 0x00007fdfbed8e036 in QApplication::notify (this=0x7ffcc7f14d80, receiver=0x1755420, e=0x175aa30) at kernel/qapplication.cpp:3561
#15 0x00007fdfbe4532a8 in QCoreApplication::notifyInternal2 (receiver=0x1755420, event=event@entry=0x175aa30) at kernel/qcoreapplication.cpp:1015
#16 0x00007fdfbe45516a in QCoreApplication::sendEvent (event=0x175aa30, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:225
#17 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x1350880) at kernel/qcoreapplication.cpp:1650
#18 0x00007fdfbe4a5a02 in QEventDispatcherUNIX::processEvents (this=0x13adfc0, flags=flags@entry=...) at kernel/qeventdispatcher_unix.cpp:579
#19 0x00007fdfa89278fd in QUnixEventDispatcherQPA::processEvents (this=<optimized out>, flags=...) at eventdispatchers/qunixeventdispatcher.cpp:62
#20 0x00007fdfbe450ffa in QEventLoop::exec (this=this@entry=0x7ffcc7f14c70, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#21 0x00007fdfbe4596bc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1285
#22 0x00007fdfc090b226 in kdemain () from /usr/lib/x86_64-linux-gnu/libkdeinit5_kwin_x11.so
#23 0x00007fdfc0558830 in __libc_start_main (main=0x400730, argc=3, argv=0x7ffcc7f14f08, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffcc7f14ef8) at ../csu/libc-start.c:291
#24 0x0000000000400769 in _start ()

Reported using DrKonqi