Bug 355566

Application: kwin_x11 (5.4.2)

Qt Version: 5.5.1
Operating System: Linux 4.2.0-1-amd64 x86_64
Distribution: Debian GNU/Linux unstable (sid)

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

Radnom crash a minute after KDE started. I wasn't doing anything specific, except for moving my mouse.

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".
[Current thread is 1 (Thread 0x7fd804d84940 (LWP 19985))]

Thread 4 (Thread 0x7fd7dffff700 (LWP 20027)):
#0  0x00007fd8048822d3 in select () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd802eb59cf in qt_safe_select (nfds=12, fdread=fdread@entry=0x7fd7d8000a78, fdwrite=fdwrite@entry=0x7fd7d8000d08, fdexcept=fdexcept@entry=0x7fd7d8000f98, orig_timeout=orig_timeout@entry=0x0) at kernel/qcore_unix.cpp:75
#2  0x00007fd802eb752c in QEventDispatcherUNIX::select (timeout=0x0, exceptfds=0x7fd7d8000f98, writefds=0x7fd7d8000d08, readfds=0x7fd7d8000a78, nfds=<optimized out>, this=0x7fd7d80008c0) at kernel/qeventdispatcher_unix.cpp:320
#3  QEventDispatcherUNIXPrivate::doSelect (this=this@entry=0x7fd7d80008e0, flags=..., flags@entry=..., timeout=timeout@entry=0x0) at kernel/qeventdispatcher_unix.cpp:196
#4  0x00007fd802eb7a3e in QEventDispatcherUNIX::processEvents (this=0x7fd7d80008c0, flags=...) at kernel/qeventdispatcher_unix.cpp:607
#5  0x00007fd802e6135a in QEventLoop::exec (this=this@entry=0x7fd7dfffec60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fd802c7d8d4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007fd7fd7bc105 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fd802c8287e in QThreadPrivate::start (arg=0x29aae30) at thread/qthread_unix.cpp:331
#9  0x00007fd803edd0a4 in start_thread (arg=0x7fd7dffff700) at pthread_create.c:309
#10 0x00007fd80488906d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7fd7d7fff700 (LWP 20032)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd801e131c4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007fd801e13209 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007fd803edd0a4 in start_thread (arg=0x7fd7d7fff700) at pthread_create.c:309
#4  0x00007fd80488906d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7fd74e0ce700 (LWP 20384)):
#0  0x00007fd8048822d3 in select () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd802eb59cf in qt_safe_select (nfds=14, fdread=fdread@entry=0x7fd748000a78, fdwrite=fdwrite@entry=0x7fd748000d08, fdexcept=fdexcept@entry=0x7fd748000f98, orig_timeout=orig_timeout@entry=0x0) at kernel/qcore_unix.cpp:75
#2  0x00007fd802eb752c in QEventDispatcherUNIX::select (timeout=0x0, exceptfds=0x7fd748000f98, writefds=0x7fd748000d08, readfds=0x7fd748000a78, nfds=<optimized out>, this=0x7fd7480008c0) at kernel/qeventdispatcher_unix.cpp:320
#3  QEventDispatcherUNIXPrivate::doSelect (this=this@entry=0x7fd7480008e0, flags=..., flags@entry=..., timeout=timeout@entry=0x0) at kernel/qeventdispatcher_unix.cpp:196
#4  0x00007fd802eb7a3e in QEventDispatcherUNIX::processEvents (this=0x7fd7480008c0, flags=...) at kernel/qeventdispatcher_unix.cpp:607
#5  0x00007fd802e6135a in QEventLoop::exec (this=this@entry=0x7fd74e0cdc60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007fd802c7d8d4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007fd7fd7bc105 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fd802c8287e in QThreadPrivate::start (arg=0x2324390) at thread/qthread_unix.cpp:331
#9  0x00007fd803edd0a4 in start_thread (arg=0x7fd74e0ce700) at pthread_create.c:309
#10 0x00007fd80488906d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7fd804d84940 (LWP 19985)):
[KCrash Handler]
#6  0x00007fd7eded767f in QXcbWindow::handleClientMessageEvent (this=0x2bd0c90, event=0x7fd7e8001bc0) at qxcbwindow.cpp:1942
#7  0x00007fd7edec285b in QXcbConnection::handleXcbEvent (this=this@entry=0x1affde0, event=event@entry=0x7fd7e8001bc0) at qxcbconnection.cpp:1066
#8  0x00007fd7edec2d83 in QXcbConnection::processXcbEvents (this=0x1affde0) at qxcbconnection.cpp:1502
#9  0x00007fd802e93601 in QObject::event (this=0x1affde0, e=<optimized out>) at kernel/qobject.cpp:1239
#10 0x00007fd803757ffc in QApplicationPrivate::notify_helper (this=this@entry=0x1af83b0, receiver=receiver@entry=0x1affde0, e=e@entry=0x7fd7e80062f0) at kernel/qapplication.cpp:3716
#11 0x00007fd80375d4c6 in QApplication::notify (this=0x7ffe16665060, receiver=0x1affde0, e=0x7fd7e80062f0) at kernel/qapplication.cpp:3499
#12 0x00007fd802e63bcb in QCoreApplication::notifyInternal (this=0x7ffe16665060, receiver=0x1affde0, event=event@entry=0x7fd7e80062f0) at kernel/qcoreapplication.cpp:965
#13 0x00007fd802e65fc6 in QCoreApplication::sendEvent (event=0x7fd7e80062f0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#14 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x1ae95c0) at kernel/qcoreapplication.cpp:1593
#15 0x00007fd802eb7902 in QEventDispatcherUNIX::processEvents (this=0x1b2dd10, flags=flags@entry=...) at kernel/qeventdispatcher_unix.cpp:579
#16 0x00007fd7edf2578d in QUnixEventDispatcherQPA::processEvents (this=<optimized out>, flags=...) at eventdispatchers/qunixeventdispatcher.cpp:62
#17 0x00007fd802e6135a in QEventLoop::exec (this=this@entry=0x7ffe16664f80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#18 0x00007fd802e6943c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#19 0x00007fd80319d8ec in QGuiApplication::exec () at kernel/qguiapplication.cpp:1527
#20 0x00007fd803754435 in QApplication::exec () at kernel/qapplication.cpp:2976
#21 0x00007fd804b514d4 in kdemain (argc=1, argv=0x7ffe166651c8) at ../main_x11.cpp:303
#22 0x00007fd8047c4b45 in __libc_start_main (main=0x4007a0 <main(int, char**)>, argc=3, argv=0x7ffe166651c8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe166651b8) at libc-start.c:287
#23 0x00000000004007ce in _start ()

Possible duplicates by query: bug 355221, bug 353563.

Reported using DrKonqi