Bug 227679

Summary: Plasma crashes when switching desktops on dual screen
Product: [Unmaintained] plasma4 Reporter: Petr Kulhavy <brain>
Component: generalAssignee: Plasma Bugs List <plasma-bugs>
Status: RESOLVED DUPLICATE    
Severity: crash CC: andresbajotierra, brain
Priority: NOR    
Version: unspecified   
Target Milestone: ---   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Petr Kulhavy 2010-02-19 15:39:53 UTC 
Application: plasma-desktop (0.3)
KDE Platform Version: 4.4.00 (KDE 4.4.0)
Qt Version: 4.6.1
Operating System: Linux 2.6.31-19-generic-pae i686
Distribution: Ubuntu 9.10

-- Information about the crash:
My Plasma is set up Plasma for dual monitor output. I dragged few windows from one screen to the other and then switched virtual desktops. When switching desktops Plasma crashed.

 -- Backtrace:
Application: Plasma Workspace (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0xb3783760 (LWP 8286))]

Thread 4 (Thread 0xa55feb70 (LWP 8290)):
#0  0xb78ce430 in __kernel_vsyscall ()
#1  0xb5a2ce15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb77eb87d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb5aa18c2 in QMutexPrivate::wait (this=0x9b237c8, timeout=-1) at thread/qmutex_unix.cpp:84
#4  0xb5a9d082 in QMutex::lock (this=0x9b2fff0) at thread/qmutex.cpp:205
#5  0xb5bb9aa8 in QMutexLocker::relock (ptr=0xa55fb680) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:120
#6  QMutexLocker (ptr=0xa55fb680) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:102
#7  QMetaObject::addGuard (ptr=0xa55fb680) at kernel/qobject.cpp:429
#8  0xb73955ac in QPointer (this=0x9baa348, job=0xa5e00ed8) at /usr/include/qt4/QtCore/qpointer.h:60
#9  KIO::SchedulerPrivate::ProtocolInfo::findJobCoSlave (this=0x9baa348, job=0xa5e00ed8) at ../../kio/kio/scheduler.cpp:204
#10 KIO::SchedulerPrivate::cancelJob (this=0x9baa348, job=0xa5e00ed8) at ../../kio/kio/scheduler.cpp:510
#11 0xb7395a9f in KIO::Scheduler::cancelJob (job=0xa5e00ed8) at ../../kio/kio/scheduler.cpp:357
#12 0xb72da089 in ~SimpleJob (this=0xa5e00ed8, __in_chrg=<value optimized out>) at ../../kio/kio/job.cpp:382
#13 0xb72da29d in ~TransferJob (this=0xa5e00ed8, __in_chrg=<value optimized out>) at ../../kio/kio/job.cpp:939
#14 0xb5bb4055 in qDeleteInEventHandler (o=0xfffffe00) at kernel/qobject.cpp:3980
#15 0xb5bb5778 in QObject::event (this=0xa5e00ed8, e=0xf) at kernel/qobject.cpp:1231
#16 0xb5e6d27c in QApplicationPrivate::notify_helper (this=0x9af5fb0, receiver=0xa5e00ed8, e=0xa5e04668) at kernel/qapplication.cpp:4298
#17 0xb5e73ede in QApplication::notify (this=0x9ae25f0, receiver=0xa5e00ed8, e=0xa5e04668) at kernel/qapplication.cpp:3702
#18 0xb6bf21fa in KApplication::notify (this=0x9ae25f0, receiver=0xa5e00ed8, event=0xa5e04668) at ../../kdeui/kernel/kapplication.cpp:302
#19 0xb5ba4cfb in QCoreApplication::notifyInternal (this=0x9ae25f0, receiver=0xa5e00ed8, event=0xa5e04668) at kernel/qcoreapplication.cpp:704
#20 0xb5ba7733 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0xa9659e8) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#21 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0xa9659e8) at kernel/qcoreapplication.cpp:1345
#22 0xb5ba789d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1238
#23 0xb5bd0def in QCoreApplication::sendPostedEvents (s=0xa9bee68) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#24 postEventSourceDispatch (s=0xa9bee68) at kernel/qeventdispatcher_glib.cpp:276
#25 0xb405de88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#26 0xb4061730 in ?? () from /lib/libglib-2.0.so.0
#27 0xb4061863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#28 0xb5bd08e5 in QEventDispatcherGlib::processEvents (this=0xaab0ae8, flags=...) at kernel/qeventdispatcher_glib.cpp:412
#29 0xb5ba3319 in QEventLoop::processEvents (this=0xa55fbee4, flags=) at kernel/qeventloop.cpp:149
#30 0xb5ba376a in QEventLoop::exec (this=0xa55fbee4, flags=...) at kernel/qeventloop.cpp:201
#31 0xb738035b in KIO::NetAccess::enter_loop (this=0xa55fbf84) at ../../kio/kio/netaccess.cpp:502
#32 0xb7380a36 in KIO::NetAccess::synchronousRunInternal (this=0xa55fbf84, job=0xad9bec0, window=0x0, data=0xa55fc028, finalURL=0x0, metaData=0x0) at ../../kio/kio/netaccess.cpp:487
#33 0xb738129b in KIO::NetAccess::synchronousRun (job=0xad9bec0, window=0x0, data=0xa55fc028, finalURL=0x0, metaData=0x0) at ../../kio/kio/netaccess.cpp:277
#34 0xa7e4bf92 in ?? () from /usr/lib/kde4/plasma_applet_cwp.so
#35 0xa7e57b72 in ?? () from /usr/lib/kde4/plasma_applet_cwp.so
#36 0xa7e59648 in ?? () from /usr/lib/kde4/plasma_applet_cwp.so
#37 0xb5aa232e in QThreadPrivate::start (arg=0xa961008) at thread/qthread_unix.cpp:248
#38 0xb5a2880e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#39 0xb77de8de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 3 (Thread 0xa3cceb70 (LWP 8291)):
[KCrash Handler]
#6  0xb5bb998e in QMetaObject::addGuard (ptr=0xa3ccb680) at kernel/qobject.cpp:430
#7  0xb73955ac in QPointer (this=0x9baa348, job=0xa1723c18) at /usr/include/qt4/QtCore/qpointer.h:60
#8  KIO::SchedulerPrivate::ProtocolInfo::findJobCoSlave (this=0x9baa348, job=0xa1723c18) at ../../kio/kio/scheduler.cpp:204
#9  KIO::SchedulerPrivate::cancelJob (this=0x9baa348, job=0xa1723c18) at ../../kio/kio/scheduler.cpp:510
#10 0xb7395a9f in KIO::Scheduler::cancelJob (job=0xa1723c18) at ../../kio/kio/scheduler.cpp:357
#11 0xb72da089 in ~SimpleJob (this=0xa1723c18, __in_chrg=<value optimized out>) at ../../kio/kio/job.cpp:382
#12 0xb72da29d in ~TransferJob (this=0xa1723c18, __in_chrg=<value optimized out>) at ../../kio/kio/job.cpp:939
#13 0xb5bb4055 in qDeleteInEventHandler (o=0x11) at kernel/qobject.cpp:3980
#14 0xb5bb5778 in QObject::event (this=0xa1723c18, e=0x9b237c8) at kernel/qobject.cpp:1231
#15 0xb5e6d27c in QApplicationPrivate::notify_helper (this=0x9af5fb0, receiver=0xa1723c18, e=0xa17f5c30) at kernel/qapplication.cpp:4298
#16 0xb5e73ede in QApplication::notify (this=0x9ae25f0, receiver=0xa1723c18, e=0xa17f5c30) at kernel/qapplication.cpp:3702
#17 0xb6bf21fa in KApplication::notify (this=0x9ae25f0, receiver=0xa1723c18, event=0xa17f5c30) at ../../kdeui/kernel/kapplication.cpp:302
#18 0xb5ba4cfb in QCoreApplication::notifyInternal (this=0x9ae25f0, receiver=0xa1723c18, event=0xa17f5c30) at kernel/qcoreapplication.cpp:704
#19 0xb5ba7733 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0xadac348) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#20 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0xadac348) at kernel/qcoreapplication.cpp:1345
#21 0xb5ba789d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1238
#22 0xb5bd0def in QCoreApplication::sendPostedEvents (s=0xadbb500) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#23 postEventSourceDispatch (s=0xadbb500) at kernel/qeventdispatcher_glib.cpp:276
#24 0xb405de88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#25 0xb4061730 in ?? () from /lib/libglib-2.0.so.0
#26 0xb4061863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#27 0xb5bd08e5 in QEventDispatcherGlib::processEvents (this=0xadc37a0, flags=...) at kernel/qeventdispatcher_glib.cpp:412
#28 0xb5ba3319 in QEventLoop::processEvents (this=0xa3ccbee4, flags=) at kernel/qeventloop.cpp:149
#29 0xb5ba376a in QEventLoop::exec (this=0xa3ccbee4, flags=...) at kernel/qeventloop.cpp:201
#30 0xb738035b in KIO::NetAccess::enter_loop (this=0xa3ccbf84) at ../../kio/kio/netaccess.cpp:502
#31 0xb7380a36 in KIO::NetAccess::synchronousRunInternal (this=0xa3ccbf84, job=0xa1715630, window=0x0, data=0xa3ccc028, finalURL=0x0, metaData=0x0) at ../../kio/kio/netaccess.cpp:487
#32 0xb738129b in KIO::NetAccess::synchronousRun (job=0xa1715630, window=0x0, data=0xa3ccc028, finalURL=0x0, metaData=0x0) at ../../kio/kio/netaccess.cpp:277
#33 0xa7e4bf92 in ?? () from /usr/lib/kde4/plasma_applet_cwp.so
#34 0xa7e57b72 in ?? () from /usr/lib/kde4/plasma_applet_cwp.so
#35 0xa7e59648 in ?? () from /usr/lib/kde4/plasma_applet_cwp.so
#36 0xb5aa232e in QThreadPrivate::start (arg=0xad81238) at thread/qthread_unix.cpp:248
#37 0xb5a2880e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#38 0xb77de8de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xa34cdb70 (LWP 8292)):
#0  0xb78ce430 in __kernel_vsyscall ()
#1  0xb5a2ce15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb77eb87d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb5aa18c2 in QMutexPrivate::wait (this=0x9b237c8, timeout=-1) at thread/qmutex_unix.cpp:84
#4  0xb5a9d082 in QMutex::lock (this=0x9b2fff0) at thread/qmutex.cpp:205
#5  0xb5bb9aa8 in QMutexLocker::relock (ptr=0xa34ca680) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:120
#6  QMutexLocker (ptr=0xa34ca680) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:102
#7  QMetaObject::addGuard (ptr=0xa34ca680) at kernel/qobject.cpp:429
#8  0xb73955ac in QPointer (this=0x9baa348, job=0xa2b35650) at /usr/include/qt4/QtCore/qpointer.h:60
#9  KIO::SchedulerPrivate::ProtocolInfo::findJobCoSlave (this=0x9baa348, job=0xa2b35650) at ../../kio/kio/scheduler.cpp:204
#10 KIO::SchedulerPrivate::cancelJob (this=0x9baa348, job=0xa2b35650) at ../../kio/kio/scheduler.cpp:510
#11 0xb7395a9f in KIO::Scheduler::cancelJob (job=0xa2b35650) at ../../kio/kio/scheduler.cpp:357
#12 0xb72da089 in ~SimpleJob (this=0xa2b35650, __in_chrg=<value optimized out>) at ../../kio/kio/job.cpp:382
#13 0xb72da29d in ~TransferJob (this=0xa2b35650, __in_chrg=<value optimized out>) at ../../kio/kio/job.cpp:939
#14 0xb5bb4055 in qDeleteInEventHandler (o=0xfffffe00) at kernel/qobject.cpp:3980
#15 0xb5bb5778 in QObject::event (this=0xa2b35650, e=0xf) at kernel/qobject.cpp:1231
#16 0xb5e6d27c in QApplicationPrivate::notify_helper (this=0x9af5fb0, receiver=0xa2b35650, e=0xa5e0ce28) at kernel/qapplication.cpp:4298
#17 0xb5e73ede in QApplication::notify (this=0x9ae25f0, receiver=0xa2b35650, e=0xa5e0ce28) at kernel/qapplication.cpp:3702
#18 0xb6bf21fa in KApplication::notify (this=0x9ae25f0, receiver=0xa2b35650, event=0xa5e0ce28) at ../../kdeui/kernel/kapplication.cpp:302
#19 0xb5ba4cfb in QCoreApplication::notifyInternal (this=0x9ae25f0, receiver=0xa2b35650, event=0xa5e0ce28) at kernel/qcoreapplication.cpp:704
#20 0xb5ba7733 in QCoreApplication::sendEvent (receiver=0x0, event_type=0, data=0xaec4c58) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#21 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0xaec4c58) at kernel/qcoreapplication.cpp:1345
#22 0xb5ba789d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1238
#23 0xb5bd0def in QCoreApplication::sendPostedEvents (s=0xaf00558) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#24 postEventSourceDispatch (s=0xaf00558) at kernel/qeventdispatcher_glib.cpp:276
#25 0xb405de88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#26 0xb4061730 in ?? () from /lib/libglib-2.0.so.0
#27 0xb4061863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#28 0xb5bd08e5 in QEventDispatcherGlib::processEvents (this=0xae8caf0, flags=...) at kernel/qeventdispatcher_glib.cpp:412
#29 0xb5ba3319 in QEventLoop::processEvents (this=0xa34caee4, flags=) at kernel/qeventloop.cpp:149
#30 0xb5ba376a in QEventLoop::exec (this=0xa34caee4, flags=...) at kernel/qeventloop.cpp:201
#31 0xb738035b in KIO::NetAccess::enter_loop (this=0xa34caf84) at ../../kio/kio/netaccess.cpp:502
#32 0xb7380a36 in KIO::NetAccess::synchronousRunInternal (this=0xa34caf84, job=0xa5e2dbf8, window=0x0, data=0xa34cb028, finalURL=0x0, metaData=0x0) at ../../kio/kio/netaccess.cpp:487
#33 0xb738129b in KIO::NetAccess::synchronousRun (job=0xa5e2dbf8, window=0x0, data=0xa34cb028, finalURL=0x0, metaData=0x0) at ../../kio/kio/netaccess.cpp:277
#34 0xa7e4bf92 in ?? () from /usr/lib/kde4/plasma_applet_cwp.so
#35 0xa7e57b72 in ?? () from /usr/lib/kde4/plasma_applet_cwp.so
#36 0xa7e59648 in ?? () from /usr/lib/kde4/plasma_applet_cwp.so
#37 0xb5aa232e in QThreadPrivate::start (arg=0xaeb4640) at thread/qthread_unix.cpp:248
#38 0xb5a2880e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#39 0xb77de8de in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb3783760 (LWP 8286)):
#0  0xb78ce430 in __kernel_vsyscall ()
#1  0xb5a2ce15 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb77eb87d in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb5aa18c2 in QMutexPrivate::wait (this=0x9b237c8, timeout=-1) at thread/qmutex_unix.cpp:84
#4  0xb5a9d082 in QMutex::lock (this=0x9b2fff0) at thread/qmutex.cpp:205
#5  0xb5bb9aa8 in QMutexLocker::relock (ptr=0xab11d90) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:120
#6  QMutexLocker (ptr=0xab11d90) at ../../include/QtCore/../../src/corelib/thread/qmutex.h:102
#7  QMetaObject::addGuard (ptr=0xab11d90) at kernel/qobject.cpp:429
#8  0xb7399145 in QPointer (this=0xaebb1d8, t=...) at /usr/include/qt4/QtCore/qpointer.h:62
#9  QList<QPointer<KIO::Slave> >::node_construct (this=0xaebb1d8, t=...) at /usr/include/qt4/QtCore/qlist.h:351
#10 QList<QPointer<KIO::Slave> >::append (this=0xaebb1d8, t=...) at /usr/include/qt4/QtCore/qlist.h:472
#11 0xb73985aa in KIO::SchedulerPrivate::startJobDirect (this=0x9baa348) at ../../kio/kio/scheduler.cpp:703
#12 0xb7398b80 in KIO::SchedulerPrivate::startStep (this=0x9baa348) at ../../kio/kio/scheduler.cpp:526
#13 0xb7398e7e in KIO::Scheduler::qt_metacall (this=0xa4fe168, _c=QMetaObject::InvokeMetaMethod, _id=6, _a=0xbfb61e4c) at ./scheduler.moc:108
#14 0xb5ba9f6a in QMetaObject::metacall (object=0xa4fe168, cl=128, idx=10, argv=0xbfb61e4c) at kernel/qmetaobject.cpp:237
#15 0xb5bb8705 in QMetaObject::activate (sender=0x9baa34c, m=0xb5cb95a4, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3275
#16 0xb5c09ec7 in QTimer::timeout (this=0x9baa34c) at .moc/release-shared/moc_qtimer.cpp:134
#17 0xb5bc083e in QTimer::timerEvent (this=0x9baa34c, e=0xbfb62380) at kernel/qtimer.cpp:271
#18 0xb5bb55a4 in QObject::event (this=0x9baa34c, e=0xf) at kernel/qobject.cpp:1212
#19 0xb5e6d27c in QApplicationPrivate::notify_helper (this=0x9af5fb0, receiver=0x9baa34c, e=0xbfb62380) at kernel/qapplication.cpp:4298
#20 0xb5e73ede in QApplication::notify (this=0x9ae25f0, receiver=0x9baa34c, e=0xbfb62380) at kernel/qapplication.cpp:3702
#21 0xb6bf21fa in KApplication::notify (this=0x9ae25f0, receiver=0x9baa34c, event=0xbfb62380) at ../../kdeui/kernel/kapplication.cpp:302
#22 0xb5ba4cfb in QCoreApplication::notifyInternal (this=0x9ae25f0, receiver=0x9baa34c, event=0xbfb62380) at kernel/qcoreapplication.cpp:704
#23 0xb5bd3f96 in QCoreApplication::sendEvent (this=0x9af888c) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#24 QTimerInfoList::activateTimers (this=0x9af888c) at kernel/qeventdispatcher_unix.cpp:603
#25 0xb5bd0bf4 in timerSourceDispatch (source=0x9af8858) at kernel/qeventdispatcher_glib.cpp:184
#26 0xb405de88 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#27 0xb4061730 in ?? () from /lib/libglib-2.0.so.0
#28 0xb4061863 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#29 0xb5bd08e5 in QEventDispatcherGlib::processEvents (this=0x9acccd8, flags=...) at kernel/qeventdispatcher_glib.cpp:412
#30 0xb5f2c485 in QGuiEventDispatcherGlib::processEvents (this=0x9acccd8, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#31 0xb5ba3319 in QEventLoop::processEvents (this=0xbfb62644, flags=) at kernel/qeventloop.cpp:149
#32 0xb5ba376a in QEventLoop::exec (this=0xbfb62644, flags=...) at kernel/qeventloop.cpp:201
#33 0xb5ba795f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#34 0xb5e6d317 in QApplication::exec () at kernel/qapplication.cpp:3577
#35 0xb788b17e in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#36 0x080485cb in _start ()

Possible duplicates by query: bug 227643, bug 227010.

Reported using DrKonqi
Comment 1 Dario Andres 2010-02-19 22:41:10 UTC 
- Does Plasma always crash if you repeat the situation you mentioned ?

Or, as bug 227010/bug 227643, which seem to be related to the CWP widget:
- Does the random crashes stop if you remove the CWP widget from your Plasma Desktop ?
- Did you recompiled it / reinstalled it after updating to KDE SC 4.4. ?
Regards
Comment 2 Petr Kulhavy 2010-02-19 23:28:14 UTC 
It doesn't happen always. After the crash I tried to switch the desktops intensively but without a problem. 

What also happened after the crash, that plasma started using 100% CPU.

I did not try without the CWP widget.
Comment 3 Dario Andres 2010-02-20 21:51:55 UTC 
Please reopen this report if you experience the crash again and note if you were using the CWP widget in that moment. 
Thanks
Comment 4 Dario Andres 2010-02-26 13:45:12 UTC 
Merging with bug 227010. Thanks

*** This bug has been marked as a duplicate of bug 227010 ***