Thread 2 (Thread 0x7fffee013700 (LWP 18497)):
#0  0x00007ffff67d2c6d in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007ffff16b6b72 in poll (__timeout=-1, __nfds=1, __fds=0x7fffee012d00) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
No locals.
#2  _xcb_conn_wait (c=c@entry=0x613b60, cond=cond@entry=0x613ba0, vector=vector@entry=0x0, count=count@entry=0x0) at ../../src/xcb_conn.c:447
        ret = <optimized out>
        fd = {fd = 3, events = 1, revents = 0}
#3  0x00007ffff16b864f in xcb_wait_for_event (c=0x613b60) at ../../src/xcb_in.c:622
        ret = 0x0
#4  0x00007ffff7ec5b3d in QXcbEventReader::run (this=0x622030) at qxcbconnection.cpp:1089
        event = 0x0
#5  0x00007ffff707b033 in QThreadPrivate::start (arg=0x622030) at thread/qthread_unix.cpp:337
        __clframe = {__cancel_routine = 0x7ffff707b0ba <QThreadPrivate::finish(void*)>, __cancel_arg = 0x622030, __do_it = 1, __cancel_type = 32767}
        thr = 0x622030
        data = 0x622390
        objectName = {static null = {<No data fields>}, d = 0x7ffff7421360 <QArrayData::shared_null>}
#6  0x00007ffff5e1a182 in start_thread (arg=0x7fffee013700) at pthread_create.c:312
        __res = <optimized out>
        pd = 0x7fffee013700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140737186445056, -4546825483672467865, 1, 0, 140737186445760, 140737186445056, 4546861365469529703, 4546812166498960999}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#7  0x00007ffff67dffbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 1 (Thread 0x7ffff7fc6780 (LWP 18493)):
#0  MainWindow::textChanged (this=0x7fffffffd870) at main.cpp:61
        n = 2
        __PRETTY_FUNCTION__ = "void MainWindow::textChanged()"
        __FUNCTION__ = "textChanged"
#1  0x0000000000403863 in MainWindow::qt_static_metacall (_o=0x7fffffffd870, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0x7fffffffc380) at main.moc:76
        _t = 0x7fffffffd870
#2  0x00007ffff7335324 in QMetaObject::activate (sender=0x647220, signalOffset=7, local_signal_index=0, argv=0x7fffffffc380) at kernel/qobject.cpp:3713
        receiverInSameThread = true
        sw = {receiver = 0x7fffffffd870, previousSender = 0x0, currentSender = {sender = 0x647220, signal = 7, ref = 1}, switched = true}
        callFunction = 0x403804 <MainWindow::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>
        receiver = 0x7fffffffd870
        method_relative = 2
        c = 0x6c6e80
        last = 0x6c6e80
        locker = {val = 140737343580904}
        connectionLists = {connectionLists = 0x678c40}
        list = 0x677af8
        signal_index = 7
        empty_argv = {0x0}
        currentThreadId = 0x7ffff7fc6780
        __PRETTY_FUNCTION__ = "static void QMetaObject::activate(QObject*, int, int, void**)"
#3  0x00007ffff7334b16 in QMetaObject::activate (sender=0x647220, m=0x7ffff7dad400 <QLineEdit::staticMetaObject>, local_signal_index=0, argv=0x7fffffffc380) at kernel/qobject.cpp:3579
No locals.
#4  0x00007ffff78fb38f in QLineEdit::textChanged (this=0x647220, _t1=...) at .moc/moc_qlineedit.cpp:405
        _a = {0x0, 0x7fffffffc5a0}
#5  0x00007ffff78fa9db in QLineEdit::qt_static_metacall (_o=0x647220, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x7fffffffc550) at .moc/moc_qlineedit.cpp:236
        _t = 0x647220
#6  0x00007ffff7335324 in QMetaObject::activate (sender=0x66bfd0, signalOffset=3, local_signal_index=3, argv=0x7fffffffc550) at kernel/qobject.cpp:3713
        receiverInSameThread = true
        sw = {receiver = 0x647220, previousSender = 0x0, currentSender = {sender = 0x66bfd0, signal = 6, ref = 1}, switched = true}
        callFunction = 0x7ffff78fa968 <QLineEdit::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>
        receiver = 0x647220
        method_relative = 0
        c = 0x672650
        last = 0x71ede0
        locker = {val = 140737343580952}
        connectionLists = {connectionLists = 0x70e4e0}
        list = 0x6ab3e8
        signal_index = 6
        empty_argv = {0x0}
        currentThreadId = 0x7ffff7fc6780
        __PRETTY_FUNCTION__ = "static void QMetaObject::activate(QObject*, int, int, void**)"
#7  0x00007ffff7334b16 in QMetaObject::activate (sender=0x66bfd0, m=0x7ffff7dce560 <QWidgetLineControl::staticMetaObject>, local_signal_index=3, argv=0x7fffffffc550) at kernel/qobject.cpp:3579
No locals.
#8  0x00007ffff7bbb3b9 in QWidgetLineControl::textChanged (this=0x66bfd0, _t1=...) at .moc/moc_qwidgetlinecontrol_p.cpp:250
        _a = {0x0, 0x7fffffffc5a0}
#9  0x00007ffff799b7cf in QWidgetLineControl::finishChange (this=0x66bfd0, validateFromState=-1, update=true, edited=false) at widgets/qwidgetlinecontrol.cpp:693
        actualText = {static null = {<No data fields>}, d = 0x6e0780}
        wasValidInput = true
#10 0x00007ffff799ba83 in QWidgetLineControl::internalSetText (this=0x66bfd0, txt=..., pos=-1, edited=false) at widgets/qwidgetlinecontrol.cpp:727
        oldText = {static null = {<No data fields>}, d = 0x64e400}
        changed = 255
#11 0x00007ffff78fbcce in QWidgetLineControl::setText (this=0x66bfd0, txt=...) at ../../include/QtWidgets/5.4.0/QtWidgets/private/../../../../../src/widgets/widgets/qwidgetlinecontrol_p.h:233
No locals.
#12 0x00007ffff799fe10 in QWidgetLineControl::processKeyEvent (this=0x66bfd0, event=0x7fffffffd5f0) at widgets/qwidgetlinecontrol.cpp:1598
        completionMode = QCompleter::InlineCompletion
        inlineCompletionAccepted = false
        unknown = 247
        visual = 127
#13 0x00007ffff78f77bf in QLineEdit::keyPressEvent (this=0x647220, event=0x7fffffffd5f0) at widgets/qlineedit.cpp:1691
        d = 0x66bc30
#14 0x00007ffff77bae66 in QWidget::event (this=0x647220, event=0x7fffffffd5f0) at kernel/qwidget.cpp:8680
        k = 0x7fffffffd5f0
        res = false
        d = 0x66bc30
#15 0x00007ffff78f6ed6 in QLineEdit::event (this=0x647220, e=0x7fffffffd5f0) at widgets/qlineedit.cpp:1459
        d = 0x66bc30
#16 0x00007ffff78b05d4 in QComboBox::keyPressEvent (this=0x65a990, e=0x7fffffffd5f0) at widgets/qcombobox.cpp:3152
        d = 0x656290
        move = QComboBox::NoMove
        newIndex = 0
#17 0x00007ffff77bae66 in QWidget::event (this=0x65a990, event=0x7fffffffd5f0) at kernel/qwidget.cpp:8680
        k = 0x7fffffffd5f0
        res = false
        d = 0x656290
#18 0x00007ffff78afc3f in QComboBox::event (this=0x65a990, event=0x7fffffffd5f0) at widgets/qcombobox.cpp:2965
        d = 0x656290
#19 0x00007ffff776d2e4 in QApplicationPrivate::notify_helper (this=0x606ad0, receiver=0x65a990, e=0x7fffffffd5f0) at kernel/qapplication.cpp:3722
        consumed = false
#20 0x00007ffff776a96c in QApplication::notify (this=0x7fffffffd860, receiver=0x65a990, e=0x7fffffffd5f0) at kernel/qapplication.cpp:3183
        w = 0x100000001
        gw = 0x7fffffffce60
        isWidget = true
        key = 0x7fffffffd5f0
        def = true
        pr = {wp = {d = 0x700bd0, value = 0x65a990}}
        isGraphicsWidget = false
        d = 0x606ad0
        __PRETTY_FUNCTION__ = "virtual bool QApplication::notify(QObject*, QEvent*)"
        res = false
#21 0x00007ffff72f1d7c in QCoreApplication::notifyInternal (this=0x7fffffffd860, receiver=0x65a990, event=0x7fffffffd5f0) at kernel/qcoreapplication.cpp:932
        threadData = 0x6063b0
        loopLevelCounter = {threadData = 0x6063b0}
        result = false
        cbdata = {0x65a990, 0x7fffffffd5f0, 0x7fffffffcfff}
        d = 0x656290
#22 0x00007ffff777005b in QCoreApplication::sendSpontaneousEvent (receiver=0x65a990, event=0x7fffffffd5f0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
No locals.
#23 0x00007ffff77e2016 in QWidgetWindow::handleKeyEvent (this=0x714d90, event=0x7fffffffd5f0) at kernel/qwidgetwindow.cpp:536
        receiver = 0x65a990
#24 0x00007ffff77e0b06 in QWidgetWindow::event (this=0x714d90, event=0x7fffffffd5f0) at kernel/qwidgetwindow.cpp:164
No locals.
#25 0x00007ffff776d2e4 in QApplicationPrivate::notify_helper (this=0x606ad0, receiver=0x714d90, e=0x7fffffffd5f0) at kernel/qapplication.cpp:3722
        consumed = false
#26 0x00007ffff776a84a in QApplication::notify (this=0x7fffffffd860, receiver=0x714d90, e=0x7fffffffd5f0) at kernel/qapplication.cpp:3164
        d = 0x606ad0
        __PRETTY_FUNCTION__ = "virtual bool QApplication::notify(QObject*, QEvent*)"
        res = false
#27 0x00007ffff72f1d7c in QCoreApplication::notifyInternal (this=0x7fffffffd860, receiver=0x714d90, event=0x7fffffffd5f0) at kernel/qcoreapplication.cpp:932
        threadData = 0x6063b0
        loopLevelCounter = {threadData = 0x6063b0}
        result = false
        cbdata = {0x714d90, 0x7fffffffd5f0, 0x7fffffffd52f}
        d = 0x714df0
#28 0x00007ffff6134385 in QCoreApplication::sendSpontaneousEvent (receiver=0x714d90, event=0x7fffffffd5f0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
No locals.
#29 0x00007ffff612e0b8 in QGuiApplicationPrivate::processKeyEvent (e=0x6d0b30) at kernel/qguiapplication.cpp:1897
        window = 0x714d90
        ev = {<QInputEvent> = {<QEvent> = {_vptr.QEvent = 0x7ffff66ced90 <vtable for QKeyEvent+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7ffff750f920 <qt_meta_stringdata_QEvent>, data = 0x7ffff7511320 <qt_meta_data_QEvent>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}, d = 0x0, t = 6, posted = 0, spont = 1, m_accept = 1, reserved = 8191}, modState = {i = 0}, ts = 11089666}, txt = {static null = {<No data fields>}, d = 0x71fd10}, k = 16777220, nScanCode = 36, nVirtualKey = 65293, nModifiers = 0, c = 1, autor = 0}
#30 0x00007ffff612ce72 in QGuiApplicationPrivate::processWindowSystemEvent (e=0x6d0b30) at kernel/qguiapplication.cpp:1604
        __PRETTY_FUNCTION__ = "static void QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*)"
#31 0x00007ffff611683b in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:564
        event = 0x6d0b30
        nevents = 1
#32 0x00007ffff7f5af47 in QUnixEventDispatcherQPA::processEvents (this=0x624790, flags=...) at eventdispatchers/qunixeventdispatcher.cpp:63
        didSendEvents = true
#33 0x00007ffff72eeada in QEventLoop::processEvents (this=0x7fffffffd7e0, flags=...) at kernel/qeventloop.cpp:128
        d = 0x71cb50
#34 0x00007ffff72eed9b in QEventLoop::exec (this=0x7fffffffd7e0, flags=...) at kernel/qeventloop.cpp:204
        locker = {val = 6319280}
        __PRETTY_FUNCTION__ = "int QEventLoop::exec(QEventLoop::ProcessEventsFlags)"
        ref = {d = 0x71cb50, locker = @0x7fffffffd760, exceptionCaught = true}
        app = 0x7fffffffd860
        d = 0x71cb50
#35 0x00007ffff72f2454 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1185
        threadData = 0x6063b0
        __PRETTY_FUNCTION__ = "static int QCoreApplication::exec()"
        eventLoop = {<QObject> = {_vptr.QObject = 0x7ffff75e83b0 <vtable for QEventLoop+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7ffff74e8f40 <qt_meta_stringdata_QObject>, data = 0x7ffff74e9060 <qt_meta_data_QObject>, static_metacall = 0x7ffff73379ce <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x71cb50}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7ffff74f84c0 <qt_meta_stringdata_Qt>, data = 0x7ffff7502840 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7ffff75e4c80 <QObject::staticMetaObject>, stringdata = 0x7ffff750f420 <qt_meta_stringdata_QEventLoop>, data = 0x7ffff750f480 <qt_meta_data_QEventLoop>, static_metacall = 0x7ffff73c157c <QEventLoop::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
        returnCode = 0
#36 0x00007ffff612cbfc in QGuiApplication::exec () at kernel/qguiapplication.cpp:1532
No locals.
#37 0x00007ffff776a06b in QApplication::exec () at kernel/qapplication.cpp:2956
No locals.
#38 0x00000000004037a0 in main (argc=1, argv=0x7fffffffd9b8) at main.cpp:78
        a = {<QGuiApplication> = {<QCoreApplication> = {<QObject> = {_vptr.QObject = 0x7ffff7da6b90 <vtable for QApplication+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7ffff74e8f40 <qt_meta_stringdata_QObject>, data = 0x7ffff74e9060 <qt_meta_data_QObject>, static_metacall = 0x7ffff73379ce <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x606ad0}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7ffff74f84c0 <qt_meta_stringdata_Qt>, data = 0x7ffff7502840 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7ffff75e4c80 <QObject::staticMetaObject>, stringdata = 0x7ffff750f5a0 <qt_meta_stringdata_QCoreApplication>, data = 0x7ffff750f7c0 <qt_meta_data_QCoreApplication>, static_metacall = 0x7ffff73c16d4 <QCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, static self = 0x7fffffffd860}, static staticMetaObject = {d = {superdata = 0x7ffff75e8440 <QCoreApplication::staticMetaObject>, stringdata = 0x7ffff6543ec0 <qt_meta_stringdata_QGuiApplication>, data = 0x7ffff65443a0 <qt_meta_data_QGuiApplication>, static_metacall = 0x7ffff613310c <QGuiApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7ffff66ce420 <QGuiApplication::staticMetaObject>, stringdata = 0x7ffff7c1a2a0 <qt_meta_stringdata_QApplication>, data = 0x7ffff7c1a5c0 <qt_meta_data_QApplication>, static_metacall = 0x7ffff776f1d8 <QApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
        __PRETTY_FUNCTION__ = "int main(int, char**)"
        __FUNCTION__ = "main"
        w = {<QMainWindow> = {<QWidget> = {<QObject> = {_vptr.QObject = 0x604bb0 <vtable for MainWindow+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7ffff74e8f40 <qt_meta_stringdata_QObject>, data = 0x7ffff74e9060 <qt_meta_data_QObject>, static_metacall = 0x7ffff73379ce <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x655720}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7ffff74f84c0 <qt_meta_stringdata_Qt>, data = 0x7ffff7502840 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, <QPaintDevice> = {_vptr.QPaintDevice = 0x604d68 <vtable for MainWindow+456>, painters = 0, reserved = 0x0}, static staticMetaObject = {d = {superdata = 0x7ffff75e4c80 <QObject::staticMetaObject>, stringdata = 0x7ffff7c20a20 <qt_meta_stringdata_QWidget>, data = 0x7ffff7c217a0 <qt_meta_data_QWidget>, static_metacall = 0x7ffff77c3212 <QWidget::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, data = 0x655850}, static staticMetaObject = {d = {superdata = 0x7ffff7da7820 <QWidget::staticMetaObject>, stringdata = 0x7ffff7c91ac0 <qt_meta_stringdata_QMainWindow>, data = 0x7ffff7c91ec0 <qt_meta_data_QMainWindow>, static_metacall = 0x7ffff7bb73ae <QMainWindow::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x7ffff7dcb390 <qt_meta_extradata_QMainWindow>, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7ffff7dcb360 <QMainWindow::staticMetaObject>, stringdata = 0x4040e0 <qt_meta_stringdata_MainWindow>, data = 0x4041a0 <qt_meta_data_MainWindow>, static_metacall = 0x403804 <MainWindow::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, box = 0x65a990, log = 0x70e450, vboxLayout = 0x715430}