Application that crashed: dolphin
Version of the application: 1.2.80
KDE Version: 4.2.90 (KDE 4.2.90 (KDE 4.3 Beta2))
Qt Version: 4.5.1
Operating System: Linux 2.6.28-13-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Dolphin crashes if I try to open four or more instances. It happens mostly when I try to copy files with multiple instances of dolphin window are opened.

 -- Backtrace:
Application: Dolphin (dolphin), signal: Segmentation fault
[Current thread is 0 (LWP 3861)]

Thread 2 (Thread 0xb1a78b90 (LWP 3985)):
#0  0xb7f35430 in __kernel_vsyscall ()
#1  0xb6054412 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb63f9344 in pthread_cond_timedwait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb2908ae3 in ?? () from /usr/lib/libxine.so.1

Thread 1 (Thread 0xb5bcc700 (LWP 3861)):
[KCrash Handler]
#6  0xb6684309 in QUrl::QUrl () from /usr/lib/libQtCore.so.4
#7  0xb72d0899 in KUrl::KUrl () from /usr/lib/libkdecore.so.5
#8  0xb7db90ee in KFileItem::url () from /usr/lib/libkio.so.5
#9  0xb7c8ec5b in KFilePreviewGenerator::Private::applyCutItemEffect () from /usr/lib/libkfile.so.4
#10 0xb7c90d26 in KFilePreviewGenerator::Private::updateIcons () from /usr/lib/libkfile.so.4
#11 0xb7c90fc8 in KFilePreviewGenerator::Private::delayedIconUpdate () from /usr/lib/libkfile.so.4
#12 0xb7c91f0e in KFilePreviewGenerator::qt_metacall () from /usr/lib/libkfile.so.4
#13 0xb66e6a58 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#14 0xb66e76e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#15 0xb67224d7 in QTimer::timeout () from /usr/lib/libQtCore.so.4
#16 0xb66ec4ae in QTimer::timerEvent () from /usr/lib/libQtCore.so.4
#17 0xb66e0f0f in QObject::event () from /usr/lib/libQtCore.so.4
#18 0xb68e7bcc in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#19 0xb68efede in QApplication::notify () from /usr/lib/libQtGui.so.4
#20 0xb7652e8d in KApplication::notify () from /usr/lib/libkdeui.so.5
#21 0xb66d07ab in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#22 0xb66ffb31 in ?? () from /usr/lib/libQtCore.so.4
#23 0xb66fc280 in ?? () from /usr/lib/libQtCore.so.4
#24 0xb5e4eb88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#25 0xb5e520eb in ?? () from /usr/lib/libglib-2.0.so.0
#26 0xb5e52268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#27 0xb66fc1d8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#28 0xb6989765 in ?? () from /usr/lib/libQtGui.so.4
#29 0xb66cedda in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#30 0xb66cf21a in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#31 0xb66d16c9 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#32 0xb68e7a47 in QApplication::exec () from /usr/lib/libQtGui.so.4
#33 0x0807a8af in _start ()

Reported using DrKonqi