[Bug 157647] New: Plasma crashes when adding / removing widgets too fast

[Oliver Putz]

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http://bugs.kde.org/show_bug.cgi?id=157647         
           Summary: Plasma crashes when adding / removing widgets too fast
           Product: plasma
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: NEW
          Severity: crash
          Priority: NOR
         Component: general
        AssignedTo: panel-devel kde org
        ReportedBy: Regnaron web de


Version:            (using Devel)
Installed from:    Compiled sources
Compiler:          gcc version 4.1.2 20070214 
OS:                Linux

Steps to reproduce:

1) Open add widgets dialog
2) Add a widget (I used the analog clock)
3) Move mouse over minus sign
4) Click three times fast on left mouse button to add a widget (first two clicks) and remove it before it gets completely drawn (third mouse click)
5) See plasma (kdelibs r772899, kdebase r772956, no compositing) crash with the following backtrace:

Application: Plasma Workspace (plasma), signal SIGSEGV
[?1034hUsing host libthread_db library "/lib/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 0xb625f6e0 (LWP 10601)]
[New Thread 0xb4afdb90 (LWP 10602)]
[KCrash handler]
#5  0xb6fe206a in QGraphicsItem::transform (this=0x82f5090)
    at graphicsview/qgraphicsitem.cpp:1684
#6  0xb6fe8f2f in QGraphicsItem::setTransform (this=0x82f5090, 
    matrix= 0xbfc383e0, combine=false) at graphicsview/qgraphicsitem.cpp:1860
#7  0xb6fe9697 in QGraphicsItem::resetTransform (this=0x82f5090)
    at graphicsview/qgraphicsitem.cpp:1907
#8  0xb4b0444b in DefaultAnimator::appear (this=0x81332a0, 
    progress=0.83333333333333337, item=0x82f5090)
    at /var/tmp/portage/kde-base/kdebase-9999.4/work/kdebase-9999.4/workspace/plasma/animators/default/defaultAnimator.cpp:73
#9  0xb7e85775 in Plasma::Phase::Private::performAnimation (this=0x81269d8, 
    amount=0.83333333333333337, state=0x830eac0)
    at /var/tmp/portage/kde-base/kdebase-9999.4/work/kdebase-9999.4/workspace/libs/plasma/phase.cpp:127
#10 0xb7e80e05 in Plasma::Phase::timerEvent (this=0x8132988, event=0xbfc38c08)
    at /var/tmp/portage/kde-base/kdebase-9999.4/work/kdebase-9999.4/workspace/libs/plasma/phase.cpp:463
#11 0xb73d9269 in QObject::event (this=0x8132988, e=0xb4b06ce8)
    at kernel/qobject.cpp:1086
#12 0xb6a68e8a in QApplicationPrivate::notify_helper (this=0x8078708, 
    receiver=0x8132988, e=0xbfc38c08) at kernel/qapplication.cpp:3556
#13 0xb6a6a77a in QApplication::notify (this=0x8057118, receiver=0x8132988, 
    e=0xbfc38c08) at kernel/qapplication.cpp:3115
#14 0xb7984763 in KApplication::notify (this=0x8057118, receiver=0x8132988, 
    event=0xbfc38c08)
    at /var/tmp/portage/kde-base/kdelibs-9999.4/work/kdelibs-9999.4/kdeui/kernel/kapplication.cpp:311
#15 0xb73c7d7b in QCoreApplication::notifyInternal (this=0x8057118, 
    receiver=0x8132988, event=0xbfc38c08) at kernel/qcoreapplication.cpp:530
#16 0xb73f0efb in QTimerInfoList::activateTimers (this=0x8078e44)
    at kernel/qcoreapplication.h:200
#17 0xb73f0fd1 in QEventDispatcherUNIX::activateTimers (this=0x8078108)
    at kernel/qeventdispatcher_unix.cpp:828
#18 0xb73f19ab in QEventDispatcherUNIX::processEvents (this=0x8078108, 
    flags= 0xbfc38d88) at kernel/qeventdispatcher_unix.cpp:890
#19 0xb6af2cce in QEventDispatcherX11::processEvents (this=0x8078108, 
    flags= 0xbfc38db4) at kernel/qeventdispatcher_x11.cpp:145
#20 0xb73c7191 in QEventLoop::processEvents (this=0xbfc38e20, 
    flags= 0xbfc38de8) at kernel/qeventloop.cpp:140
#21 0xb73c729a in QEventLoop::exec (this=0xbfc38e20, flags= 0xbfc38e28)
    at kernel/qeventloop.cpp:186
#22 0xb73c9626 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:759
#23 0xb6a68487 in QApplication::exec () at kernel/qapplication.cpp:3053
#24 0xb7f45d54 in kdemain (argc=1, argv=0xbfc39024)
    at /var/tmp/portage/kde-base/kdebase-9999.4/work/kdebase-9999.4/workspace/plasma/plasma/main.cpp:54
#25 0x080487e2 in main (argc=-1263517712, argv=0xb4b040b0)
    at /var/tmp/portage/kde-base/kdebase-9999.4/work/kdebase_build/workspace/plasma/plasma/plasma-qgv_dummy.cpp:3
#26 0xb64f1fdc in __libc_start_main (main=0x80487c0 <main>, argc=1, 
    ubp_av=0xbfc39024, init=0x8048810 <__libc_csu_init>, 
    fini=0x8048800 <__libc_csu_fini>, rtld_fini=0xb7f60100 <_dl_fini>, 
    stack_end=0xbfc3901c) at libc-start.c:229
#27 0x08048731 in _start ()
#0  0xffffe410 in __kernel_vsyscall ()