Version:           4.1.00 (KDE 4.1.0) (using 4.1.00 (KDE 4.1.0), Kubuntu packages)
Compiler:          cc
OS:                Linux (i686) release 2.6.26-5-generic

I was ironically triaging Ubuntu bug reports at Launchpad when I opened up two bug reports in new tabs. When I navigated to one of the tabs this crash occured.

Application: Konqueror (konqueror), signal SIGABRT
[Thread debugging using libthread_db enabled]
[New Thread 0xb5fb3700 (LWP 5351)]
[New Thread 0xaf96eb90 (LWP 5612)]
[KCrash handler]
#6  0xb7f9f424 in __kernel_vsyscall ()
#7  0xb7d71860 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb7d73228 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb7daf0ad in ?? () from /lib/tls/i686/cmov/libc.so.6
#10 0xb7db5394 in ?? () from /lib/tls/i686/cmov/libc.so.6
#11 0xb7db73f6 in free () from /lib/tls/i686/cmov/libc.so.6
#12 0xb72e5ebd in qFree () from /usr/lib/libQtCore.so.4
#13 0xb752cebb in ~KFilterDev (this=0x10)
    at /usr/include/qt4/QtCore/qbytearray.h:370
#14 0xb40dbd1f in ~KHTMLPageCacheEntry (this=0xb3e35c8)
    at /build/buildd/kde4libs-4.1.0/khtml/khtml_pagecache.cpp:94
#15 0xb40dcfda in KHTMLPageCache::createCacheEntry (this=0x909ed38)
    at /build/buildd/kde4libs-4.1.0/khtml/khtml_pagecache.cpp:158
#16 0xb408cabe in KHTMLPart::slotData (this=0x9b61b88, kio_job=0xcbe49f8, 
    data=@0xbf8b7d54)
    at /build/buildd/kde4libs-4.1.0/khtml/khtml_part.cpp:1595
#17 0xb40b1bd7 in KHTMLPart::qt_metacall (this=0x9b61b88, 
    _c=QMetaObject::InvokeMetaMethod, _id=19, _a=0xbf8b7aa8)
    at /build/buildd/kde4libs-4.1.0/obj-i486-linux-gnu/khtml/khtml_part.moc:264
#18 0xb73f07e0 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#19 0xb73f1562 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#20 0xb7afffc9 in KIO::TransferJob::data (this=0xcbe49f8, _t1=0xcbe49f8, 
    _t2=@0xbf8b7d54)
    at /build/buildd/kde4libs-4.1.0/obj-i486-linux-gnu/kio/jobclasses.moc:356
#21 0xb7b00962 in KIO::TransferJob::slotData (this=0xcbe49f8, 
    _data=@0xbf8b7d54) at /build/buildd/kde4libs-4.1.0/kio/kio/job.cpp:927
#22 0xb7b0b3d5 in KIO::TransferJob::qt_metacall (this=0xcbe49f8, 
    _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xbf8b7bcc)
    at /build/buildd/kde4libs-4.1.0/obj-i486-linux-gnu/kio/jobclasses.moc:337
#23 0xb73f07e0 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#24 0xb73f1562 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#25 0xb7bcae43 in KIO::SlaveInterface::data (this=0x11c3ab38, _t1=@0xbf8b7d54)
    at /build/buildd/kde4libs-4.1.0/obj-i486-linux-gnu/kio/slaveinterface.moc:136
#26 0xb7bceabc in KIO::SlaveInterface::dispatch (this=0x11c3ab38, _cmd=100, 
    rawdata=@0xbf8b7d54)
    at /build/buildd/kde4libs-4.1.0/kio/kio/slaveinterface.cpp:162
#27 0xb7bcb4a7 in KIO::SlaveInterface::dispatch (this=0x11c3ab38)
    at /build/buildd/kde4libs-4.1.0/kio/kio/slaveinterface.cpp:90
#28 0xb7bbb46d in KIO::Slave::gotInput (this=0x11c3ab38)
    at /build/buildd/kde4libs-4.1.0/kio/kio/slave.cpp:319
#29 0xb7bbdeb3 in KIO::Slave::qt_metacall (this=0x11c3ab38, 
    _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbf8b7e68)
    at /build/buildd/kde4libs-4.1.0/obj-i486-linux-gnu/kio/slave.moc:75
#30 0xb73f07e0 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#31 0xb73f1562 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#32 0xb7ace4d7 in KIO::Connection::readyRead (this=0x10cd6ba8)
    at /build/buildd/kde4libs-4.1.0/obj-i486-linux-gnu/kio/connection.moc:84
#33 0xb7ad05a9 in KIO::ConnectionPrivate::dequeue (this=0xf6a09c0)
    at /build/buildd/kde4libs-4.1.0/kio/kio/connection.cpp:82
#34 0xb7ad0736 in KIO::Connection::qt_metacall (this=0x10cd6ba8, 
    _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x115d3b48)
    at /build/buildd/kde4libs-4.1.0/obj-i486-linux-gnu/kio/connection.moc:72
#35 0xb73e995b in QMetaCallEvent::placeMetaCall ()
   from /usr/lib/libQtCore.so.4
#36 0xb73eb4f1 in QObject::event () from /usr/lib/libQtCore.so.4
#37 0xb68e4bfc in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#38 0xb68eca6e in QApplication::notify () from /usr/lib/libQtGui.so.4
#39 0xb78aad7d in KApplication::notify (this=0xbf8b87d4, receiver=0x10cd6ba8, 
    event=0xabc1cd8)
    at /build/buildd/kde4libs-4.1.0/kdeui/kernel/kapplication.cpp:311
#40 0xb73dbbbf in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#41 0xb73dc845 in QCoreApplicationPrivate::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#42 0xb73dca3d in QCoreApplication::sendPostedEvents ()
   from /usr/lib/libQtCore.so.4
#43 0xb74065bf in ?? () from /usr/lib/libQtCore.so.4
#44 0xb635c7e1 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#45 0xb635fe83 in ?? () from /usr/lib/libglib-2.0.so.0
#46 0xb6360041 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#47 0xb7406208 in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#48 0xb697eb45 in ?? () from /usr/lib/libQtGui.so.4
#49 0xb73da28a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#50 0xb73da44a in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#51 0xb73dcb05 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#52 0xb68e4a77 in QApplication::exec () from /usr/lib/libQtGui.so.4
#53 0xb7f6b5bd in kdemain (argc=3, argv=0xbf8b8af4)
    at /build/buildd/kdebase-4.1.0/apps/konqueror/src/konqmain.cpp:227
#54 0x080485b2 in main (argc=)
    at /build/buildd/kdebase-4.1.0/obj-i486-linux-gnu/apps/konqueror/src/konqueror_dummy.cpp:3
#0  0xb7f9f424 in __kernel_vsyscall ()