Application: konsole (3.0.1)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-10-generic x86_64
Distribution: Ubuntu Vivid Vervet (development branch)

-- Information about the crash:
This has happened to me on multiple occasions;  I'm running Ubuntu 15.04 (vivid) with packaged version of KDE as of March 30.  The machine has a HiDPI screen and nvidia 346 driver (possibly not directly related, but I had the crashes).

I have saved a core dump, and can poke around it if needed.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Konsole (konsole), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f44b386e800 (LWP 7016))]

Thread 2 (Thread 0x7f449e06c700 (LWP 7017)):
#0  __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
#1  0x00007f44ab812cfd in __GI___pthread_mutex_lock (mutex=0x7b2de8) at ../nptl/pthread_mutex_lock.c:80
#2  0x00007f44ad840d94 in _xcb_conn_wait (c=c@entry=0x7b2dd0, cond=cond@entry=0x7b2e10, vector=vector@entry=0x0, count=count@entry=0x0) at ../../src/xcb_conn.c:464
#3  0x00007f44ad84264f in xcb_wait_for_event (c=0x7b2dd0) at ../../src/xcb_in.c:622
#4  0x00007f44a07fe049 in QXcbEventReader::run (this=0x7c1d30) at qxcbconnection.cpp:1105
#5  0x00007f44afc69b0e in QThreadPrivate::start (arg=0x7c1d30) at thread/qthread_unix.cpp:337
#6  0x00007f44ab8106aa in start_thread (arg=0x7f449e06c700) at pthread_create.c:333
#7  0x00007f44b333aeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f44b386e800 (LWP 7016)):
[KCrash Handler]
#6  poll_for_reply (c=c@entry=0x7b2dd0, request=request@entry=4176, reply=reply@entry=0x7fff3e0698a8, error=error@entry=0x7fff3e0699a8) at ../../src/xcb_in.c:422
#7  0x00007f44ad842414 in wait_for_reply (c=c@entry=0x7b2dd0, request=4176, e=e@entry=0x7fff3e0699a8) at ../../src/xcb_in.c:489
#8  0x00007f44ad842512 in xcb_wait_for_reply (c=0x7b2dd0, request=4176, e=0x7fff3e0699a8) at ../../src/xcb_in.c:520
#9  0x00007f44adc9869f in _XReply () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#10 0x00007f44a039cf32 in XIQueryDevice () from /usr/lib/x86_64-linux-gnu/libXi.so.6
#11 0x00007f44a081c169 in QXcbConnection::handleEnterEvent (this=0x7b1710) at qxcbconnection_xi2.cpp:635
#12 0x00007f44a080d1a9 in QXcbWindow::handleEnterNotifyEvent (this=0xdeb860, event=0x7f4498004b40) at qxcbwindow.cpp:2101
#13 0x00007f44a07fd8e8 in QXcbConnection::handleXcbEvent (this=this@entry=0x7b1710, event=event@entry=0x7f4498004b40) at qxcbconnection.cpp:895
#14 0x00007f44a07fe46b in QXcbConnection::processXcbEvents (this=0x7b1710) at qxcbconnection.cpp:1303
#15 0x00007f44afed970a in QObject::event (this=0x7b1710, e=<optimized out>) at kernel/qobject.cpp:1245
#16 0x00007f44b07b1b2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007f44b07b7000 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007f44afea7bfb in QCoreApplication::notifyInternal (this=0x7fff3e06a3c0, receiver=0x7b1710, event=event@entry=0x7f44980034a0) at kernel/qcoreapplication.cpp:935
#19 0x00007f44afea9c6b in sendEvent (event=0x7f44980034a0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#20 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x74b720) at kernel/qcoreapplication.cpp:1552
#21 0x00007f44afeaa268 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#22 0x00007f44aff007d3 in postEventSourceDispatch (s=0x7eb960) at kernel/qeventdispatcher_glib.cpp:271
#23 0x00007f44ab0dbc3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f44ab0dbf20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f44ab0dbfcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007f44aff00bfc in QEventDispatcherGlib::processEvents (this=0x7f2ea0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#27 0x00007f44afea53b2 in QEventLoop::exec (this=this@entry=0x7fff3e06a280, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#28 0x00007f44afeacffc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#29 0x00007f44b361f76f in kdemain () from /usr/lib/x86_64-linux-gnu/libkdeinit5_konsole.so
#30 0x00007f44b3254a40 in __libc_start_main (main=0x400720 <main>, argc=1, argv=0x7fff3e06a508, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff3e06a4f8) at libc-start.c:289
#31 0x000000000040074e in _start ()

Reported using DrKonqi