Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.2.90 (KDE 4.2.90 (KDE 4.3 Beta2))
Qt Version: 4.5.1
Operating System: Linux 2.6.28-12-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
My monitor was turned off (power saving), i tried to turn it on by moving mouse and voila - plasma crashed. My desktop activity was set to "folder view", and after restarting plasma it didn't want to show anything.

 -- Backtrace:
Application: Plasma Workspace (kdeinit), signal: Segmentation fault
[Current thread is 0 (LWP 3231)]

Thread 3 (Thread 0xa86fbb90 (LWP 3234)):
#0  0xb80b4430 in __kernel_vsyscall ()
#1  0xb65b00e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb67902ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7eb85b2 in QWaitCondition::wait (this=0x8a1f410, mutex=0x8a1f40c, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb77fcae2 in QHostInfoAgent::run (this=0x8a1f400) at kernel/qhostinfo.cpp:260
#5  0xb7eb756e in QThreadPrivate::start (arg=0x8a1f400) at thread/qthread_unix.cpp:189
#6  0xb65ac4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb678149e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xa408db90 (LWP 3235)):
#0  0xb80b4430 in __kernel_vsyscall ()
#1  0xb65b0412 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb6790344 in pthread_cond_timedwait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7eb6f59 in thread_sleep (ti=0xa408d2b0) at thread/qthread_unix.cpp:298
#4  0xb7eb708b in QThread::msleep (msecs=<value optimized out>) at thread/qthread_unix.cpp:324
#5  0xa8895138 in Update_Thread::run () from /usr/lib/kde4/plasma_applet_cwp.so
#6  0xb7eb756e in QThreadPrivate::start (arg=0x8bb71f8) at thread/qthread_unix.cpp:189
#7  0xb65ac4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#8  0xb678149e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb60baa10 (LWP 3231)):
[KCrash Handler]
#6  IconView::popupVisible (this=0x9b62090) at /build/buildd/kdebase-4.2.90/apps/plasma/applets/folderview/iconview.cpp:1199
#7  0xb6a9d682 in QWidget::event (this=0x9b62090, event=0xbfdd0948) at kernel/qwidget.cpp:7647
#8  0xb6a46bcc in QApplicationPrivate::notify_helper (this=0x85b05e8, receiver=0x9b62090, e=0xbfdd0948) at kernel/qapplication.cpp:4057
#9  0xb6a4efc2 in QApplication::notify (this=0x857f9c8, receiver=0x9b62090, e=0xbfdd0948) at kernel/qapplication.cpp:4022
#10 0xb757fe8d in KApplication::notify (this=0x857f9c8, receiver=0x9b62090, event=0xbfdd0948) at /build/buildd/kde4libs-4.2.90/kdeui/kernel/kapplication.cpp:302
#11 0xb7fab7ab in QCoreApplication::notifyInternal (this=0x857f9c8, receiver=0x9b62090, event=0xbfdd0948) at kernel/qcoreapplication.cpp:610
#12 0xb6a4e073 in QApplicationPrivate::dispatchEnterLeave (enter=0x94f61e0, leave=0x9b62090) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#13 0xb6abd83e in QApplication::x11ProcessEvent (this=0x857f9c8, event=0xbfdd1eac) at kernel/qapplication_x11.cpp:3639
#14 0xb6ae906a in x11EventSourceDispatch (s=0x85b33b0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#15 0xb65f9b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#16 0xb65fd0eb in ?? () from /usr/lib/libglib-2.0.so.0
#17 0xb65fd268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#18 0xb7fd71d8 in QEventDispatcherGlib::processEvents (this=0x85afe60, flags={i = -1076027288}) at kernel/qeventdispatcher_glib.cpp:324
#19 0xb6ae8765 in QGuiEventDispatcherGlib::processEvents (this=0x85afe60, flags={i = -1076027240}) at kernel/qguieventdispatcher_glib.cpp:202
#20 0xb7fa9dda in QEventLoop::processEvents (this=0xbfdd2110, flags={i = -1076027176}) at kernel/qeventloop.cpp:149
#21 0xb7faa21a in QEventLoop::exec (this=0xbfdd2110, flags={i = -1076027112}) at kernel/qeventloop.cpp:200
#22 0xb7fac6c9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#23 0xb6a46a47 in QApplication::exec () at kernel/qapplication.cpp:3526
#24 0xb3e4b820 in kdemain (argc=1, argv=0x8548b40) at /build/buildd/kdebase-workspace-4.2.90/plasma/shells/desktop/main.cpp:50
#25 0x0804e1c0 in launch (argc=1, _name=0x8583f14 "/usr/bin/plasma-desktop", args=0x8583f2c "", cwd=0x0, envc=0, envs=0x8583f30 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x80512d0 "0") at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:671
#26 0x0804e99d in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1163
#27 0x0804ef25 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1356
#28 0x0804fb0a in main (argc=2, argv=0xbfdd2904, envp=0xbfdd2910) at /build/buildd/kde4libs-4.2.90/kinit/kinit.cpp:1783

Reported using DrKonqi