Bug 436008

Application: ksysguard (5.19.5)

Qt Version: 5.14.2
Frameworks Version: 5.74.0
Operating System: Linux 5.8.0-50-generic x86_64
Windowing system: X11
Distribution: Ubuntu 20.10

-- Information about the crash:
- What I was doing when the application crashed: Running a Deja-Dup backup which caused system to max out on CPU.

- Unusual behavior I noticed: The system was extremely slow and so was KSysGuard when I tried to use it. Deja Dup had a low priority (as set by me).

The crash can be reproduced sometimes.

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

[KCrash Handler]
#4  0x00007f1499a436f8 in QWidget::sizePolicy (this=this@entry=0x556eb7804bb0) at kernel/qwidget.cpp:10072
#5  0x00007f1499b4f923 in QLabelPrivate::updateLabel (this=0x556eb7554850, this@entry=0x7ffc4d14f0b0) at widgets/qlabel.cpp:1132
#6  0x00007f1499b50f84 in QLabel::setText (this=0x556eb75eb520, text=...) at widgets/qlabel.cpp:326
#7  0x00007f149a8bd9db in TopLevel::answerReceived (this=0x556eb74f3230, id=<optimized out>, answerList=...) at ./gui/ksysguard.cpp:466
#8  0x00007f149a600122 in KSGRD::SensorAgent::processAnswer(char const*, int) () from /lib/x86_64-linux-gnu/libksgrd.so.9
#9  0x00007f149a606325 in ?? () from /lib/x86_64-linux-gnu/libksgrd.so.9
#10 0x00007f1498e142e6 in QtPrivate::QSlotObjectBase::call (a=0x7ffc4d14f3b0, r=0x556eb7631bf0, this=0x556eb7501200) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#11 doActivate<false> (sender=0x556eb75da1d0, signal_index=15, argv=argv@entry=0x7ffc4d14f3b0) at kernel/qobject.cpp:3870
#12 0x00007f1498e0e068 in QMetaObject::activate (sender=<optimized out>, m=m@entry=0x7f1499067de0 <QProcess::staticMetaObject>, local_signal_index=local_signal_index@entry=6, argv=argv@entry=0x7ffc4d14f3b0) at kernel/qobject.cpp:3930
#13 0x00007f1498d4b9c1 in QProcess::readyReadStandardOutput (this=<optimized out>, _t1=...) at .moc/moc_qprocess.cpp:367
#14 0x00007f1498d5111d in QProcessPrivate::tryReadFromChannel (this=0x556eb75364f0, channel=0x556eb7536600) at io/qprocess.cpp:1057
#15 0x00007f1498d51675 in QProcessPrivate::_q_canReadStandardError (this=<optimized out>) at io/qprocess.cpp:1084
#16 QProcess::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=0x7ffc4d14f560) at .moc/moc_qprocess.cpp:210
#17 0x00007f1498e14320 in doActivate<false> (sender=0x556eb7582470, signal_index=3, argv=argv@entry=0x7ffc4d14f560) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:395
#18 0x00007f1498e0e068 in QMetaObject::activate (sender=sender@entry=0x556eb7582470, m=m@entry=0x7f149906a1c0 <QSocketNotifier::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffc4d14f560) at kernel/qobject.cpp:3930
#19 0x00007f1498e178b5 in QSocketNotifier::activated (this=this@entry=0x556eb7582470, _t1=<optimized out>, _t2=...) at .moc/moc_qsocketnotifier.cpp:141
#20 0x00007f1498e17c51 in QSocketNotifier::event (this=0x556eb7582470, e=0x7ffc4d14f660) at kernel/qsocketnotifier.cpp:266
#21 0x00007f1499a1a013 in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x556eb7582470, e=0x7ffc4d14f660) at kernel/qapplication.cpp:3685
#22 0x00007f1498dde1ca in QCoreApplication::notifyInternal2 (receiver=0x556eb7582470, event=0x7ffc4d14f660) at ../../include/QtCore/../../src/corelib/kernel/qobject.h:153
#23 0x00007f1498e36425 in socketNotifierSourceDispatch (source=0x556eb7156720) at kernel/qeventdispatcher_glib.cpp:107
#24 0x00007f149049162b in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f14904918d8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007f14904919a3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007f1498e35843 in QEventDispatcherGlib::processEvents (this=0x556eb7169290, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#28 0x00007f1498ddca4b in QEventLoop::exec (this=this@entry=0x7ffc4d14f870, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:136
#29 0x00007f1498de4fc6 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:118
#30 0x00007f149a8beaf3 in kdemain (argc=<optimized out>, argv=<optimized out>) at ./gui/ksysguard.cpp:627
#31 0x00007f149a68ecb2 in __libc_start_main (main=0x556eb6302060 <main>, argc=1, argv=0x7ffc4d14fa98, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc4d14fa88) at ../csu/libc-start.c:314
#32 0x0000556eb630209e in _start ()
[Inferior 1 (process 19288) detached]

The reporter indicates this bug may be a duplicate of or related to bug 434779, bug 428064.

Possible duplicates by query: bug 434779, bug 433838, bug 433733, bug 428064, bug 425064.

Reported using DrKonqi