This is the backtrace I got, after installing debug-packages:

Anwendung: Dolphin (dolphin), Signal SIGABRT
[Thread debugging using libthread_db enabled]
[New Thread 0xb602a700 (LWP 23451)]
[KCrash handler]
#6  0xb8021424 in __kernel_vsyscall ()
#7  0xb6585720 in raise () from /lib/libc.so.6
#8  0xb6587058 in abort () from /lib/libc.so.6
#9  0xb7e9d965 in qt_message_output () from /usr/lib/libQtCore.so.4
#10 0xb7e9da17 in qFatal () from /usr/lib/libQtCore.so.4
#11 0xb7e9daa6 in qt_assert () from /usr/lib/libQtCore.so.4
#12 0xb77144dd in KDirModelPrivate::_k_slotNewItems ()
   from /usr/lib/libkio.so.5
#13 0xb7714615 in KDirModel::qt_metacall () from /usr/lib/libkio.so.5
#14 0xb7f92b03 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#15 0xb7f93063 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#16 0xb76f72c4 in KDirLister::newItems () from /usr/lib/libkio.so.5
#17 0xb76f82db in KDirLister::Private::emitItems () from /usr/lib/libkio.so.5
#18 0xb76fa232 in KDirListerCache::slotEntries () from /usr/lib/libkio.so.5
#19 0xb770abfb in KDirListerCache::qt_metacall () from /usr/lib/libkio.so.5
#20 0xb7f92b03 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#21 0xb7f93063 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#22 0xb76ce10a in KIO::ListJob::entries () from /usr/lib/libkio.so.5
#23 0xb76db283 in KIO::ListJobPrivate::slotListEntries ()
   from /usr/lib/libkio.so.5
#24 0xb76db410 in KIO::ListJob::qt_metacall () from /usr/lib/libkio.so.5
#25 0xb7f92b03 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#26 0xb7f93063 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#27 0xb779ec64 in KIO::SlaveInterface::listEntries ()
   from /usr/lib/libkio.so.5
#28 0xb77a2927 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#29 0xb779f4bc in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#30 0xb778f2be in KIO::Slave::gotInput () from /usr/lib/libkio.so.5
#31 0xb7791d3b in KIO::Slave::qt_metacall () from /usr/lib/libkio.so.5
#32 0xb7f92b03 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#33 0xb7f93063 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#34 0xb769ba98 in KIO::Connection::readyRead () from /usr/lib/libkio.so.5
#35 0xb769dbed in KIO::ConnectionPrivate::dequeue () from /usr/lib/libkio.so.5
#36 0xb769dd6e in KIO::Connection::qt_metacall () from /usr/lib/libkio.so.5
#37 0xb7f8d92b in QMetaCallEvent::placeMetaCall ()
   from /usr/lib/libQtCore.so.4
#38 0xb7f8f4f9 in QObject::event () from /usr/lib/libQtCore.so.4
#39 0xb6c30eac in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#40 0xb6c37423 in QApplication::notify () from /usr/lib/libQtGui.so.4
#41 0xb7a65e9e in KApplication::notify () from /usr/lib/libkdeui.so.5
#42 0xb7f80f60 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#43 0xb7f818e0 in QCoreApplicationPrivate::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#44 0xb7f81a7e in QCoreApplication::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#45 0xb7fa8090 in ?? () from /usr/lib/libQtCore.so.4
#46 0x00000000 in ?? ()
#0  0xb8021424 in __kernel_vsyscall ()



also the konsole, gives me these messages:

dolphin(23451) DirectoryListThread::run: Failed to open dir: "/home/pano/home/"        
dolphin(23451)/kio (KDirListerCache) KDirListerCache::forgetDirs: DolphinDirLister(0x9e35058)  item moved into cache:  KUrl("file:///home/pano")                              
dolphin(23451)/kio (KDirListerCache) KDirListerCache::listDir: Listing directory: KUrl("file://home")                                                                         
dolphin(23451)/kio (KDirWatch) KDirWatchPrivate::addEntry: Added Dir "home" NotExisting for "" ["KDirWatch-2"]                                                                
dolphin(23451)/kio (KDirWatch) KDirWatchPrivate::useINotify: trying to use inotify formonitoring
dolphin(23451)/kio (KDirWatch) KDirWatchPrivate::addEntry: Added Dir "home/.." NotExisting for "home" [""]
dolphin(23451)/kio (KDirWatch) KDirWatchPrivate::useINotify: trying to use inotify formonitoring
dolphin(23451)/kio (KDirWatch) KDirWatchPrivate::addEntry: Added Dir ".." for "home/.." [""]
dolphin(23451)/kio (KDirWatch) KDirWatchPrivate::useINotify: trying to use inotify formonitoring
dolphin(23451)/kio (KDirWatch) KDirWatchPrivate::useINotify: inotify successfully usedfor monitoring
ASSERT: "result" in file /home/jan/Dev/packages/kdemod-core/work/kdelibs/src/kdelibs-4.1.2/kio/kio/kdirmodel.cpp, line 310
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = dolphin path = <unknown> pid = 23451
sock_file=/home/pano/.kde4/socket-arch/kdeinit4__0

Thanks for the bug report. I can reproduce this in 4.1.2 (Kubuntu), but not in trunk rev. 875277. Probably a duplicate of bug 170695 (which is fixed in trunk, to become KDE 4.2). I'm not sure if it's fixed in the 4.1.x branch or not.

When I enter media/ I also get a crash, so this might be a duplicate

Something I noticed:

every folder in the / directory, crashes dolphin, if it is entered in this special way.

For example:
var/ or bin/

BUT:
If I create a folder in the / dir, named "test", and enter test/ in dolphin it doesn't crash

(In reply to comment #4)
> BUT:
> If I create a folder in the / dir, named "test", and enter test/ in dolphin it
> doesn't crash

I don't know why that doesn't crash, but it's most probably a duplicate.

*** This bug has been marked as a duplicate of bug 170695 ***