Application: ksysguard (5.19.5)

Qt Version: 5.14.2
Frameworks Version: 5.74.0
Operating System: Linux 5.8.0-43-generic x86_64
Windowing system: X11
Distribution: Ubuntu 20.10

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

Gwenview has a history of crashing on my system (I keep using it because even with multiple crashes per session it's a damn useful little app), and sometimes fails to exit fully afterwards. When I use System Monitor to find and issue either SIGTERM or SIGKILL -- often with a keyboard SHIFT-DEL -- a significant % of the time, maybe 20-25% of the time, System Monitor crashes immediately after successful termination of Gwenview. 

I believe one or two other apps have caused a similar ksysguard crash before, but I failed to note which. I will pay more attention next time and submit further info if warranted.

-- Backtrace:
Application: System Monitor (ksysguard), signal: Segmentation fault

[KCrash Handler]
#4  0x00007fae41ec6d2d in operator==(QString const&, QString const&) (s1=..., s2=...) at text/qstring.cpp:3383
#5  0x00007fae42d96e79 in QLabel::setText(QString const&) (this=0x56234c0b6250, text=...) at widgets/qlabel.cpp:287
#6  0x00007fae43b039db in TopLevel::answerReceived(int, QList<QByteArray> const&) (this=0x56234c3a8990, id=<optimized out>, answerList=...) at ./gui/ksysguard.cpp:466
#7  0x00007fae43846122 in KSGRD::SensorAgent::processAnswer(char const*, int) (this=0x56234c3eed30, buf=<optimized out>, buflen=<optimized out>) at ./ksgrd/SensorAgent.cpp:91
#8  0x00007fae4384c325 in KSGRD::SensorShellAgent::msgRcvd() (this=0x56234c3eed30) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qarraydata.h:208
#9  0x00007fae4205a2e6 in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7ffd6961b450, r=0x56234c3eed30, this=0x56234c13a340) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#10 doActivate<false>(QObject*, int, void**) (sender=0x56234c010620, signal_index=15, argv=argv@entry=0x7ffd6961b450) at kernel/qobject.cpp:3870
#11 0x00007fae42054068 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=<optimized out>, m=m@entry=0x7fae422adde0 <QProcess::staticMetaObject>, local_signal_index=local_signal_index@entry=6, argv=argv@entry=0x7ffd6961b450) at kernel/qobject.cpp:3930
#12 0x00007fae41f919c1 in QProcess::readyReadStandardOutput(QProcess::QPrivateSignal) (this=<optimized out>, _t1=...) at .moc/moc_qprocess.cpp:367
#13 0x00007fae41f9711d in QProcessPrivate::tryReadFromChannel(QProcessPrivate::Channel*) (this=0x56234c134cc0, channel=0x56234c134dd0) at io/qprocess.cpp:1057
#14 0x00007fae41f97675 in QProcessPrivate::_q_canReadStandardError() (this=<optimized out>) at io/qprocess.cpp:1084
#15 QProcess::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=0x7ffd6961b600) at .moc/moc_qprocess.cpp:210
#16 0x00007fae4205a320 in doActivate<false>(QObject*, int, void**) (sender=0x56234c3fb550, signal_index=3, argv=argv@entry=0x7ffd6961b600) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:395
#17 0x00007fae42054068 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=sender@entry=0x56234c3fb550, m=m@entry=0x7fae422b01c0 <QSocketNotifier::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffd6961b600) at kernel/qobject.cpp:3930
#18 0x00007fae4205d8b5 in QSocketNotifier::activated(int, QSocketNotifier::QPrivateSignal) (this=this@entry=0x56234c3fb550, _t1=<optimized out>, _t2=...) at .moc/moc_qsocketnotifier.cpp:141
#19 0x00007fae4205dc51 in QSocketNotifier::event(QEvent*) (this=0x56234c3fb550, e=0x7ffd6961b700) at kernel/qsocketnotifier.cpp:266
#20 0x00007fae42c60013 in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x56234c3fb550, e=0x7ffd6961b700) at kernel/qapplication.cpp:3685
#21 0x00007fae420241ca in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x56234c3fb550, event=0x7ffd6961b700) at ../../include/QtCore/../../src/corelib/kernel/qobject.h:153
#22 0x00007fae4207c425 in socketNotifierSourceDispatch(GSource*, GSourceFunc, gpointer) (source=0x56234b74b8b0) at kernel/qeventdispatcher_glib.cpp:107
#23 0x00007fae396d74db in g_main_dispatch (context=0x7fae28005000) at ../../../glib/gmain.c:3325
#24 g_main_context_dispatch (context=0x7fae28005000) at ../../../glib/gmain.c:4016
#25 0x00007fae396d7788 in g_main_context_iterate (context=context@entry=0x7fae28005000, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4092
#26 0x00007fae396d7853 in g_main_context_iteration (context=0x7fae28005000, may_block=may_block@entry=1) at ../../../glib/gmain.c:4157
#27 0x00007fae4207b843 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x56234b755e50, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#28 0x00007fae42022a4b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffd6961b910, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:136
#29 0x00007fae4202afc6 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:118
#30 0x00007fae4256ede0 in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1860
#31 0x00007fae42c5ff89 in QApplication::exec() () at kernel/qapplication.cpp:2825
#32 0x00007fae43b04af3 in kdemain(int, char**) (argc=<optimized out>, argv=<optimized out>) at ./gui/ksysguard.cpp:627
#33 0x00007fae438d4cb2 in __libc_start_main (main=0x5623498d5060 <main>, argc=1, argv=0x7ffd6961bb38, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd6961bb28) at ../csu/libc-start.c:314
#34 0x00005623498d509e in _start ()
[Inferior 1 (process 379566) detached]

The reporter indicates this bug may be a duplicate of or related to bug 433733.

Possible duplicates by query: bug 433733, bug 428064, bug 425064, bug 425045, bug 423382.

Reported using DrKonqi