Version:            (using Devel)
Installed from:    Compiled sources
Compiler:          gcc 4.2.3 
OS:                Linux

Opened a link in a new tab (middle button click) and got a crash.

Backtrace (no symbols for the qt library)

Application: Konqueror (konqueror), signal SIGABRT
[Thread debugging using libthread_db enabled]
[New Thread 0xb5eca9e0 (LWP 7648)]
[New Thread 0xb1a60b90 (LWP 15858)]
[KCrash handler]
#6  0xb7ef0410 in __kernel_vsyscall ()
#7  0xb628b085 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb628ca01 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb62ce835 in ?? () from /lib/tls/i686/cmov/libc.so.6
#10 0xb62cf495 in free () from /lib/tls/i686/cmov/libc.so.6
#11 0xb6f75a3d in qFree () from /usr/lib/libQtCore.so.4
#12 0xb793947b in ~KFilterDev (this=0x95fc7d8)
    at /usr/include/qt4/QtCore/qbytearray.h:370
#13 0xb3ed6cdc in ~KHTMLPageCacheEntry (this=0xa1f4fb8)
    at /home/mark/code/kde4/kdelibs/khtml/khtml_pagecache.cpp:94
#14 0xb3ed748a in KHTMLPageCache::createCacheEntry (this=0x882de08)
    at /home/mark/code/kde4/kdelibs/khtml/khtml_pagecache.cpp:158
#15 0xb3e7b2e8 in KHTMLPart::slotData (this=0x9317678, kio_job=0x9bbd9b8, 
    data=@0xbffdcc24)
    at /home/mark/code/kde4/kdelibs/khtml/khtml_part.cpp:1563
#16 0xb3ea41cc in KHTMLPart::qt_metacall (this=0x9317678, 
    _c=QMetaObject::InvokeMetaMethod, _id=19, _a=0xbffdc988)
    at /home/mark/code/kde4/build/kdelibs/khtml/khtml_part.moc:264
#17 0xb707b4f9 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#18 0xb707bbc2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#19 0xb7bc0389 in KIO::TransferJob::data (this=0x9bbd9b8, _t1=0x9bbd9b8, 
    _t2=@0xbffdcc24)
    at /home/mark/code/kde4/build/kdelibs/kio/jobclasses.moc:356
#20 0xb7bc137e in KIO::TransferJob::slotData (this=0x9bbd9b8, 
    _data=@0xbffdcc24) at /home/mark/code/kde4/kdelibs/kio/kio/job.cpp:922
#21 0xb7bd2d9d in KIO::TransferJob::qt_metacall (this=0x9bbd9b8, 
    _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbffdcaac)
    at /home/mark/code/kde4/build/kdelibs/kio/jobclasses.moc:337
#22 0xb707b4f9 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#23 0xb707bbc2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#24 0xb7c99ed3 in KIO::SlaveInterface::data (this=0x97d1ab0, _t1=@0xbffdcc24)
    at /home/mark/code/kde4/build/kdelibs/kio/slaveinterface.moc:136
#25 0xb7c9e47b in KIO::SlaveInterface::dispatch (this=0x97d1ab0, _cmd=100, 
    rawdata=@0xbffdcc24)
    at /home/mark/code/kde4/kdelibs/kio/kio/slaveinterface.cpp:162
#26 0xb7c9a57d in KIO::SlaveInterface::dispatch (this=0x97d1ab0)
    at /home/mark/code/kde4/kdelibs/kio/kio/slaveinterface.cpp:90
#27 0xb7c8898d in KIO::Slave::gotInput (this=0x97d1ab0)
    at /home/mark/code/kde4/kdelibs/kio/kio/slave.cpp:319
#28 0xb7c896ed in KIO::Slave::qt_metacall (this=0x97d1ab0, 
    _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbffdcd38)
    at /home/mark/code/kde4/build/kdelibs/kio/slave.moc:75
#29 0xb707b4f9 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#30 0xb707bbc2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#31 0xb7b896c7 in KIO::Connection::readyRead (this=0x97d1d28)
    at /home/mark/code/kde4/build/kdelibs/kio/connection.moc:84
#32 0xb7b8b8b0 in KIO::ConnectionPrivate::dequeue (this=0x97d20b0)
    at /home/mark/code/kde4/kdelibs/kio/kio/connection.cpp:82
#33 0xb7b8b96e in KIO::Connection::qt_metacall (this=0x97d1d28, 
    _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x9fbe648)
    at /home/mark/code/kde4/build/kdelibs/kio/connection.moc:72
#34 0xb7074e8b in QMetaCallEvent::placeMetaCall ()
   from /usr/lib/libQtCore.so.4
#35 0xb7076ed1 in QObject::event () from /usr/lib/libQtCore.so.4
#36 0xb6665c0c in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#37 0xb666a7a9 in QApplication::notify () from /usr/lib/libQtGui.so.4
#38 0xb7745d6d in KApplication::notify (this=0xbffdd68c, receiver=0x97d1d28, 
    event=0x9629200)
    at /home/mark/code/kde4/kdelibs/kdeui/kernel/kapplication.cpp:311
#39 0xb70666a9 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#40 0xb7067a59 in QCoreApplicationPrivate::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#41 0xb7067c7d in QCoreApplication::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#42 0xb7091bcf in ?? () from /usr/lib/libQtCore.so.4
#43 0xb5fffbf8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#44 0xb6002e5e in ?? () from /usr/lib/libglib-2.0.so.0
#45 0xb60033ac in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#46 0xb7091f98 in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#47 0xb66f91b5 in ?? () from /usr/lib/libQtGui.so.4
#48 0xb706592d in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#49 0xb7065abd in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#50 0xb7067d3d in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#51 0xb6665567 in QApplication::exec () from /usr/lib/libQtGui.so.4
#52 0xb7ed5908 in kdemain (argc=3, argv=0xbffdd9b4)
    at /home/mark/code/kde4/kdebase/apps/konqueror/src/konqmain.cpp:226
#53 0x08048762 in main (argc=)
    at /home/mark/code/kde4/build/kdebase/apps/konqueror/src/konqueror_dummy.cpp:3
#0  0xb7ef0410 in __kernel_vsyscall ()