https://bugs.kde.org/show_bug.cgi?id=463251
Bug ID: 463251
Summary: When no central widget is set, the Help menu
autogenerates a button to activate KCommandBar, which
makes the application segfault
Classification: Frameworks and Libraries
Product: frameworks-kxmlgui
Version: 5.101.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kdelibs-b...@kde.org
Reporter: herzensch...@gmail.com
Target Milestone: ---
Result of running the following in an example program where simply not having a
central widget causes the activation of KCommandBar to crash the application:
gdb ./build/kxmlguiwindowexample -batch -ex "set debuginfod enabled on" -ex
"set logging file kxmlguiwindowlog.txt" -ex "set logging on" -ex "run" -ex
"thread apply all backtrace" -ex "quit"
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7ffff11ff6c0 (LWP 1760)]
[New Thread 0x7fffebfff6c0 (LWP 1765)]
[New Thread 0x7fffe37fe6c0 (LWP 1766)]
[New Thread 0x7fffe994d6c0 (LWP 1796)]
[New Thread 0x7fffe914c6c0 (LWP 1797)]
[New Thread 0x7fffe894b6c0 (LWP 1798)]
[New Thread 0x7fffe3fff6c0 (LWP 1799)]
[New Thread 0x7fffe2ffd6c0 (LWP 1800)]
[New Thread 0x7fffe27fc6c0 (LWP 1801)]
[Thread 0x7fffe27fc6c0 (LWP 1801) exited]
[Thread 0x7fffe2ffd6c0 (LWP 1800) exited]
Thread 1 "kxmlguiwindowex" received signal SIGSEGV, Segmentation fault.
QWidget::pos (this=0x0) at kernel/qwidget.cpp:3413
3413 QPoint result = data->crect.topLeft();
Thread 8 (Thread 0x7fffe3fff6c0 (LWP 1799) "kxmlguiwin:sh2"):
#0 __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0,
op=393, expected=0, futex_word=0x4e8218) at futex-internal.c:57
#1 __futex_abstimed_wait_common (futex_word=futex_word@entry=0x4e8218,
expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0,
private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2 0x00007ffff509008f in __GI___futex_abstimed_wait_cancelable64
(futex_word=futex_word@entry=0x4e8218, expected=expected@entry=0,
clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at
futex-internal.c:139
#3 0x00007ffff5092cd0 in __pthread_cond_wait_common (abstime=0x0, clockid=0,
mutex=0x4e81c8, cond=0x4e81f0) at pthread_cond_wait.c:503
#4 ___pthread_cond_wait (cond=0x4e81f0, mutex=0x4e81c8) at
pthread_cond_wait.c:618
#5 0x00007fffe9cbaa5b in cnd_wait (mtx=0x4e81c8, cond=0x4e81f0) at
../src/c11/impl/threads_posix.c:135
#6 util_queue_thread_func (input=input@entry=0x4e9690) at
../src/util/u_queue.c:287
#7 0x00007fffe9d03f27 in impl_thrd_routine (p=<optimized out>) at
../src/c11/impl/threads_posix.c:67
#8 0x00007ffff509398d in start_thread (arg=<optimized out>) at
pthread_create.c:442
#9 0x00007ffff511a380 in clone3 () at
../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
Thread 7 (Thread 0x7fffe894b6c0 (LWP 1798) "kxmlguiwin:sh1"):
#0 __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0,
op=393, expected=0, futex_word=0x4e8218) at futex-internal.c:57
#1 __futex_abstimed_wait_common (futex_word=futex_word@entry=0x4e8218,
expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0,
private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2 0x00007ffff509008f in __GI___futex_abstimed_wait_cancelable64
(futex_word=futex_word@entry=0x4e8218, expected=expected@entry=0,
clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at
futex-internal.c:139
#3 0x00007ffff5092cd0 in __pthread_cond_wait_common (abstime=0x0, clockid=0,
mutex=0x4e81c8, cond=0x4e81f0) at pthread_cond_wait.c:503
#4 ___pthread_cond_wait (cond=0x4e81f0, mutex=0x4e81c8) at
pthread_cond_wait.c:618
#5 0x00007fffe9cbaa5b in cnd_wait (mtx=0x4e81c8, cond=0x4e81f0) at
../src/c11/impl/threads_posix.c:135
#6 util_queue_thread_func (input=input@entry=0x4e9220) at
../src/util/u_queue.c:287
#7 0x00007fffe9d03f27 in impl_thrd_routine (p=<optimized out>) at
../src/c11/impl/threads_posix.c:67
#8 0x00007ffff509398d in start_thread (arg=<optimized out>) at
pthread_create.c:442
#9 0x00007ffff511a380 in clone3 () at
../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
Thread 6 (Thread 0x7fffe914c6c0 (LWP 1797) "kxmlguiwin:sh0"):
#0 __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0,
op=393, expected=0, futex_word=0x4e8218) at futex-internal.c:57
#1 __futex_abstimed_wait_common (futex_word=futex_word@entry=0x4e8218,
expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0,
private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2 0x00007ffff509008f in __GI___futex_abstimed_wait_cancelable64
(futex_word=futex_word@entry=0x4e8218, expected=expected@entry=0,
clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at
futex-internal.c:139
#3 0x00007ffff5092cd0 in __pthread_cond_wait_common (abstime=0x0, clockid=0,
mutex=0x4e81c8, cond=0x4e81f0) at pthread_cond_wait.c:503
#4 ___pthread_cond_wait (cond=0x4e81f0, mutex=0x4e81c8) at
pthread_cond_wait.c:618
#5 0x00007fffe9cbaa5b in cnd_wait (mtx=0x4e81c8, cond=0x4e81f0) at
../src/c11/impl/threads_posix.c:135
#6 util_queue_thread_func (input=input@entry=0x4e94e0) at
../src/util/u_queue.c:287
#7 0x00007fffe9d03f27 in impl_thrd_routine (p=<optimized out>) at
../src/c11/impl/threads_posix.c:67
#8 0x00007ffff509398d in start_thread (arg=<optimized out>) at
pthread_create.c:442
#9 0x00007ffff511a380 in clone3 () at
../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
Thread 5 (Thread 0x7fffe994d6c0 (LWP 1796) "kxmlgui:disk$0"):
#0 __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0,
op=393, expected=0, futex_word=0x4e4f18) at futex-internal.c:57
#1 __futex_abstimed_wait_common (futex_word=futex_word@entry=0x4e4f18,
expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0,
private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2 0x00007ffff509008f in __GI___futex_abstimed_wait_cancelable64
(futex_word=futex_word@entry=0x4e4f18, expected=expected@entry=0,
clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at
futex-internal.c:139
#3 0x00007ffff5092cd0 in __pthread_cond_wait_common (abstime=0x0, clockid=0,
mutex=0x4e4ec8, cond=0x4e4ef0) at pthread_cond_wait.c:503
#4 ___pthread_cond_wait (cond=0x4e4ef0, mutex=0x4e4ec8) at
pthread_cond_wait.c:618
#5 0x00007fffe9cbaa5b in cnd_wait (mtx=0x4e4ec8, cond=0x4e4ef0) at
../src/c11/impl/threads_posix.c:135
#6 util_queue_thread_func (input=input@entry=0x4e9500) at
../src/util/u_queue.c:287
#7 0x00007fffe9d03f27 in impl_thrd_routine (p=<optimized out>) at
../src/c11/impl/threads_posix.c:67
#8 0x00007ffff509398d in start_thread (arg=<optimized out>) at
pthread_create.c:442
#9 0x00007ffff511a380 in clone3 () at
../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
Thread 4 (Thread 0x7fffe37fe6c0 (LWP 1766) "WaylandEventThr"):
#0 0x00007ffff510bb7f in __GI___poll (fds=fds@entry=0x7fffe37fdbf0,
nfds=nfds@entry=2, timeout=timeout@entry=-1) at
../sysdeps/unix/sysv/linux/poll.c:29
#1 0x00007ffff3a46c56 in poll (__timeout=-1, __nfds=2, __fds=0x7fffe37fdbf0)
at /usr/include/bits/poll2.h:39
#2 QtWaylandClient::EventThread::run (this=0x468500) at
qwaylanddisplay.cpp:208
#3 0x00007ffff56f5e3d in QThreadPrivate::start (arg=0x468500) at
thread/qthread_unix.cpp:330
#4 0x00007ffff509398d in start_thread (arg=<optimized out>) at
pthread_create.c:442
#5 0x00007ffff511a380 in clone3 () at
../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
Thread 3 (Thread 0x7fffebfff6c0 (LWP 1765) "WaylandEventThr"):
#0 0x00007ffff510bb7f in __GI___poll (fds=fds@entry=0x7fffebffebf0,
nfds=nfds@entry=2, timeout=timeout@entry=-1) at
../sysdeps/unix/sysv/linux/poll.c:29
#1 0x00007ffff3a46c56 in poll (__timeout=-1, __nfds=2, __fds=0x7fffebffebf0)
at /usr/include/bits/poll2.h:39
#2 QtWaylandClient::EventThread::run (this=0x46c680) at
qwaylanddisplay.cpp:208
#3 0x00007ffff56f5e3d in QThreadPrivate::start (arg=0x46c680) at
thread/qthread_unix.cpp:330
#4 0x00007ffff509398d in start_thread (arg=<optimized out>) at
pthread_create.c:442
#5 0x00007ffff511a380 in clone3 () at
../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
Thread 2 (Thread 0x7ffff11ff6c0 (LWP 1760) "QDBusConnection"):
#0 0x00007ffff510bb7f in __GI___poll (fds=0x7fffec0053c0, nfds=2, timeout=-1)
at ../sysdeps/unix/sysv/linux/poll.c:29
#1 0x00007ffff3e6adbe in g_main_context_poll (priority=<optimized out>,
n_fds=2, fds=0x7fffec0053c0, timeout=<optimized out>, context=0x7fffec001cf0)
at ../glib/gmain.c:4543
#2 g_main_context_iterate (context=context@entry=0x7fffec001cf0,
block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at
../glib/gmain.c:4233
#3 0x00007ffff3e6aedc in g_main_context_iteration (context=0x7fffec001cf0,
may_block=1) at ../glib/gmain.c:4303
#4 0x00007ffff5933b56 in QEventDispatcherGlib::processEvents
(this=0x7fffec000b70, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#5 0x00007ffff58dab9b in QEventLoop::exec (this=this@entry=0x7ffff11febd0,
flags=..., flags@entry=...) at
../../include/QtCore/../../src/corelib/global/qflags.h:69
#6 0x00007ffff56f4c47 in QThread::exec (this=this@entry=0x7ffff70aa060
<(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at
../../include/QtCore/../../src/corelib/global/qflags.h:121
#7 0x00007ffff7031277 in QDBusConnectionManager::run (this=0x7ffff70aa060
<(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at
qdbusconnection.cpp:179
#8 0x00007ffff56f5e3d in QThreadPrivate::start (arg=0x7ffff70aa060 <(anonymous
namespace)::Q_QGS__q_manager::innerFunction()::holder>) at
thread/qthread_unix.cpp:330
#9 0x00007ffff509398d in start_thread (arg=<optimized out>) at
pthread_create.c:442
#10 0x00007ffff511a380 in clone3 () at
../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
Thread 1 (Thread 0x7ffff3491e40 (LWP 1749) "kxmlguiwindowex"):
#0 QWidget::pos (this=0x0) at kernel/qwidget.cpp:3413
#1 0x00007ffff7448b0d in KCommandBar::show (this=this@entry=0x7fffffffca00) at
/usr/src/debug/kconfigwidgets-5.101.0/src/kcommandbar.cpp:617
#2 0x00007ffff7451ef5 in KCommandBar::setActions
(this=this@entry=0x7fffffffca00, actions=...) at
/usr/src/debug/kconfigwidgets-5.101.0/src/kcommandbar.cpp:607
#3 0x00007ffff7b676bb in operator() (__closure=<optimized out>) at
/usr/src/debug/kxmlgui-5.101.0/src/kxmlguiwindow.cpp:103
#4 QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void,
KXmlGuiWindow::KXmlGuiWindow(QWidget*, Qt::WindowFlags)::<lambda()> >::call
(arg=<optimized out>, f=...) at /usr/include/qt5/QtCore/qobjectdefs_impl.h:146
#5 QtPrivate::Functor<KXmlGuiWindow::KXmlGuiWindow(QWidget*,
Qt::WindowFlags)::<lambda()>, 0>::call<QtPrivate::List<>, void> (arg=<optimized
out>, f=...) at /usr/include/qt5/QtCore/qobjectdefs_impl.h:256
#6 QtPrivate::QFunctorSlotObject<KXmlGuiWindow::KXmlGuiWindow(QWidget*,
Qt::WindowFlags)::<lambda()>, 0, QtPrivate::List<>, void>::impl(int,
QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=<optimized
out>, this_=<optimized out>, r=<optimized out>, a=<optimized out>,
ret=<optimized out>) at /usr/include/qt5/QtCore/qobjectdefs_impl.h:443
#7 0x00007ffff59132cd in QtPrivate::QSlotObjectBase::call (a=0x7fffffffcb50,
r=0x55a730, this=0x56f450) at
../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#8 doActivate<false> (sender=0x59f5f0, signal_index=4, argv=0x7fffffffcb50) at
kernel/qobject.cpp:3919
#9 0x00007ffff590c74f in QMetaObject::activate (sender=sender@entry=0x59f5f0,
m=m@entry=0x7ffff6ab8d20 <QAction::staticMetaObject>,
local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7fffffffcb50)
at kernel/qobject.cpp:3979
#10 0x00007ffff659ebb2 in QAction::triggered (this=this@entry=0x59f5f0,
_t1=<optimized out>) at .moc/moc_qaction.cpp:376
#11 0x00007ffff65a16fb in QAction::activate (this=0x59f5f0, event=<optimized
out>) at kernel/qaction.cpp:1161
#12 0x00007ffff67261f2 in QMenuPrivate::activateCausedStack
(this=this@entry=0x861340, causedStack=..., action=action@entry=0x59f5f0,
action_e=action_e@entry=QAction::Trigger, self=self@entry=true) at
widgets/qmenu.cpp:1384
#13 0x00007ffff672e054 in QMenuPrivate::activateAction (this=0x861340,
action=0x59f5f0, action_e=QAction::Trigger, self=<optimized out>) at
widgets/qmenu.cpp:1461
#14 0x00007ffff65e6c38 in QWidget::event (this=0x67a040, event=0x7fffffffd130)
at kernel/qwidget.cpp:9043
#15 0x00007ffff65a53fe in QApplicationPrivate::notify_helper
(this=this@entry=0x443240, receiver=receiver@entry=0x67a040,
e=e@entry=0x7fffffffd130) at kernel/qapplication.cpp:3637
#16 0x00007ffff65ad922 in QApplication::notify (this=<optimized out>,
receiver=0x67a040, e=<optimized out>) at kernel/qapplication.cpp:3081
#17 0x00007ffff58dc128 in QCoreApplication::notifyInternal2 (receiver=0x67a040,
event=0x7fffffffd130) at kernel/qcoreapplication.cpp:1064
#18 0x00007ffff65aba9e in QApplicationPrivate::sendMouseEvent
(receiver=0x67a040, event=event@entry=0x7fffffffd130, alienWidget=<optimized
out>, nativeWidget=0x67a040, buttonDown=buttonDown@entry=0x7ffff6af0330
<qt_button_down>, lastMouseReceiver=..., spontaneous=true,
onlyDispatchEnterLeave=false) at kernel/qapplication.cpp:2619
#19 0x00007ffff65ffea5 in QWidgetWindow::handleMouseEvent (this=0x694e90,
event=0x7fffffffd3e0) at kernel/qwidgetwindow.cpp:580
#20 0x00007ffff6602fb0 in QWidgetWindow::event (this=0x694e90,
event=0x7fffffffd3e0) at kernel/qwidgetwindow.cpp:300
#21 0x00007ffff65a53fe in QApplicationPrivate::notify_helper (this=<optimized
out>, receiver=0x694e90, e=0x7fffffffd3e0) at kernel/qapplication.cpp:3637
#22 0x00007ffff58dc128 in QCoreApplication::notifyInternal2 (receiver=0x694e90,
event=0x7fffffffd3e0) at kernel/qcoreapplication.cpp:1064
#23 0x00007ffff5d7b9ad in QGuiApplicationPrivate::processMouseEvent
(e=0x7fffe4004fc0) at kernel/qguiapplication.cpp:2285
#24 0x00007ffff5d4f37c in QWindowSystemInterface::sendWindowSystemEvents
(flags=...) at kernel/qwindowsysteminterface.cpp:1169
#25 0x00007ffff3a7d1e0 in userEventSourceDispatch (source=<optimized out>) at
qeventdispatcher_glib.cpp:74
#26 0x00007ffff3e6aa90 in g_main_dispatch (context=0x7fffec005010) at
../glib/gmain.c:3444
#27 g_main_context_dispatch (context=context@entry=0x7fffec005010) at
../glib/gmain.c:4162
#28 0x00007ffff3e6ae48 in g_main_context_iterate
(context=context@entry=0x7fffec005010, block=block@entry=1,
dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4238
#29 0x00007ffff3e6aedc in g_main_context_iteration (context=0x7fffec005010,
may_block=1) at ../glib/gmain.c:4303
#30 0x00007ffff5933b56 in QEventDispatcherGlib::processEvents (this=0x46c5c0,
flags=...) at kernel/qeventdispatcher_glib.cpp:423
#31 0x00007ffff58dab9b in QEventLoop::exec (this=this@entry=0x7fffffffd710,
flags=..., flags@entry=...) at
../../include/QtCore/../../src/corelib/global/qflags.h:69
#32 0x00007ffff58e2d06 in QCoreApplication::exec () at
../../include/QtCore/../../src/corelib/global/qflags.h:121
#33 0x0000000000405509 in main ()
A debugging session is active.
Inferior 1 [process 1749] will be killed.
Quit anyway? (y or n) [answered Y; input not from terminal]
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