Application: ksysguard (5.3.0)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-17-generic x86_64
Distribution: Ubuntu 15.04

-- Information about the crash:
- What I was doing when the application crashed:
sometimes plasma 5 crashes without reason - it happened ... 
it didnt relaunch itself so i started a new instance in konsole $(plasmashell &) and
the old plasmashell process still showed up eating 7gigs of memory but was in disk sleep
.. i wanted so see detailed mem info but there was no text so i closed the (ctrl+esc) task manager and it crashed
- Unusual behavior I noticed:
plasmashell crashed and didnt restart itself and ate up 6.8 gigs regarding to ksysguard (started in "minimal mode" via ctrl+esc

-- Backtrace:
Application: System Monitor (ksysguard), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fe04dfeb800 (LWP 4804))]

Thread 9 (Thread 0x7fe034d4a700 (LWP 4806)):
#0  0x00007fe04da408dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fe04344ab72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fe04344c64f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fe036aa7099 in QXcbEventReader::run (this=0x1f690c0) at qxcbconnection.cpp:1105
#4  0x00007fe049934b0e in QThreadPrivate::start (arg=0x1f690c0) at thread/qthread_unix.cpp:337
#5  0x00007fe0430276aa in start_thread (arg=0x7fe034d4a700) at pthread_create.c:333
#6  0x00007fe04da4beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7fe023e52700 (LWP 4809)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fe0275ac513 in radeon_drm_cs_emit_ioctl (param=0x21eb7c0) at ../../../../../../../include/c11/threads_posix.h:154
#2  0x00007fe0275abb68 in impl_thrd_routine (p=<optimized out>) at ../../../../../../../include/c11/threads_posix.h:87
#3  0x00007fe0430276aa in start_thread (arg=0x7fe023e52700) at pthread_create.c:333
#4  0x00007fe04da4beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7fe011f8f700 (LWP 4983)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fe04877a7d0 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fe04877a7f9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fe0430276aa in start_thread (arg=0x7fe011f8f700) at pthread_create.c:333
#4  0x00007fe04da4beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7fe01178e700 (LWP 4984)):
#0  0x00007fe04da408dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fe0426aaebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe0426aafcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe049bcbc6c in QEventDispatcherGlib::processEvents (this=0x7fdff0007a30, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#4  0x00007fe049b703e2 in QEventLoop::exec (this=this@entry=0x7fe01178ddc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007fe04992fb44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007fe049934b0e in QThreadPrivate::start (arg=0x25a5130) at thread/qthread_unix.cpp:337
#7  0x00007fe0430276aa in start_thread (arg=0x7fe01178e700) at pthread_create.c:333
#8  0x00007fe04da4beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fdffbfff700 (LWP 4985)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fe04846ff7d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fe0487ab6e1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fe0430276aa in start_thread (arg=0x7fdffbfff700) at pthread_create.c:333
#4  0x00007fe04da4beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fe01299d700 (LWP 4986)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fe048470f93 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fe0487ab6e1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fe0430276aa in start_thread (arg=0x7fe01299d700) at pthread_create.c:333
#4  0x00007fe04da4beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fe017fff700 (LWP 4987)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fe048470f93 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fe0487ab6e1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fe0430276aa in start_thread (arg=0x7fe017fff700) at pthread_create.c:333
#4  0x00007fe04da4beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fe0177fe700 (LWP 4988)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fe048470f93 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#2  0x00007fe0487ab6e1 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5WebKit.so.5
#3  0x00007fe0430276aa in start_thread (arg=0x7fe0177fe700) at pthread_create.c:333
#4  0x00007fe04da4beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fe04dfeb800 (LWP 4804)):
[KCrash Handler]
#6  operator== (s1=..., s2=...) at tools/qstring.cpp:2521
#7  0x00007fe04a5c2ca7 in QLabel::setText (this=0x20ed020, text=...) at widgets/qlabel.cpp:276
#8  0x00007fe04dd88539 in TopLevel::answerReceived (this=0x2048ff0, id=<optimized out>, answerList=...) at ../../gui/ksysguard.cpp:447
#9  0x00007fe04cbfb25b in KSGRD::SensorAgent::processAnswer(char const*, int) () from /usr/lib/x86_64-linux-gnu/libksgrd.so.7
#10 0x00007fe04cc02b50 in ?? () from /usr/lib/x86_64-linux-gnu/libksgrd.so.7
#11 0x00007fe049ba39c9 in QMetaObject::activate (sender=0x2104480, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3716
#12 0x00007fe049a9c33c in QProcessPrivate::tryReadFromChannel (this=0x215f1a0, channel=0x1) at io/qprocess.cpp:966
#13 0x00007fe049a9ceb0 in _q_canReadStandardOutput (this=<optimized out>) at io/qprocess.cpp:977
#14 QProcess::qt_static_metacall (_o=0x30, _c=35417632, _id=0, _a=0x7fe04dd09c10 <main_arena+16>) at .moc/moc_qprocess.cpp:136
#15 0x00007fe049ba39c9 in QMetaObject::activate (sender=0x215f010, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffeda456000) at kernel/qobject.cpp:3716
#16 0x00007fe049ba4057 in QMetaObject::activate (sender=<optimized out>, m=m@entry=0x7fe049dcd480 <QSocketNotifier::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffeda456000) at kernel/qobject.cpp:3582
#17 0x00007fe049c2345e in QSocketNotifier::activated (this=<optimized out>, _t1=14) at .moc/moc_qsocketnotifier.cpp:133
#18 0x00007fe049bb151b in QSocketNotifier::event (this=0x215f010, e=0xffeb0101) at kernel/qsocketnotifier.cpp:296
#19 0x00007fe04a47cb2c in QApplicationPrivate::notify_helper (this=0x1f4dc80, receiver=0x215f010, e=0x7ffeda456260) at kernel/qapplication.cpp:3720
#20 0x00007fe04a482000 in QApplication::notify (this=0x7ffeda456590, receiver=0x215f010, e=0x7ffeda456260) at kernel/qapplication.cpp:3503
#21 0x00007fe049b72c2b in QCoreApplication::notifyInternal (this=0x7ffeda456590, receiver=0x215f010, event=event@entry=0x7ffeda456260) at kernel/qcoreapplication.cpp:935
#22 0x00007fe049bcc345 in sendEvent (event=0x7ffeda456260, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#23 socketNotifierSourceDispatch (source=0x1f972c0) at kernel/qeventdispatcher_glib.cpp:101
#24 0x00007fe0426aac3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007fe0426aaf20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007fe0426aafcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007fe049bcbc57 in QEventDispatcherGlib::processEvents (this=0x1f929e0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#28 0x00007fe049b703e2 in QEventLoop::exec (this=this@entry=0x7ffeda456480, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#29 0x00007fe049b7802c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#30 0x00007fe049eb731c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#31 0x00007fe04a4787a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#32 0x00007fe04dd89ed9 in kdemain (argc=1, argv=<optimized out>) at ../../gui/ksysguard.cpp:594
#33 0x00007fe04d965a40 in __libc_start_main (main=0x400720 <main(int, char**)>, argc=1, argv=0x7ffeda4566d8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffeda4566c8) at libc-start.c:289
#34 0x0000000000400759 in _start ()

Reported using DrKonqi