Version:            (using KDE 4.2.0)
OS:                Linux
Installed from:    Ubuntu Packages

I'm sorry I don't remember exactly what I was doing, but here's the stacktraces.  The version of konqueror as packaged by Ubuntu is:

-------
$ apt-cache policy konqueror
konqueror:
  Installed: 4:4.2.0-0ubuntu2
  Candidate: 4:4.2.0-0ubuntu2
  Version table:
 *** 4:4.2.0-0ubuntu2 0
        500 http://us.archive.ubuntu.com jaunty/main Packages
        100 /var/lib/dpkg/status
-------

-------
Application: Konqueror (konqueror), signal SIGSEGV
0x00007f6f22c6ad81 in nanosleep () from /lib/libc.so.6
[Current thread is 0 (LWP 671)]

Thread 2 (Thread 0x7f6f15ef0950 (LWP 674)):
#0  0x00007f6f21a5856d in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f6f251f6357 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007f6f251ec579 in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007f6f251f5392 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007f6f21a543ba in start_thread () from /lib/libpthread.so.0
#5  0x00007f6f22ca90ad in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f6f27cad700 (LWP 671)):
[KCrash Handler]
#5  widthMediaFeatureEval (value=0x147a420, style=0x13f1870, part=0xf9e7d0, op=MinPrefix) at /build/buildd/kde4libs-4.2.0/khtml/xml/dom_docimpl.h:367
#6  0x00007f6f1816f372 in khtml::MediaQueryEvaluator::eval (this=0x13f10f0, expr=0x147e270) at /build/buildd/kde4libs-4.2.0/khtml/css/css_mediaquery.cpp:774
#7  0x00007f6f1816f4a6 in khtml::MediaQueryEvaluator::eval (this=0x13f10f0, mediaList=0x147bcd0, styleSelector=0x1312290) at /build/buildd/kde4libs-4.2.0/khtml/css/css_mediaquery.cpp:296
#8  0x00007f6f18148767 in khtml::CSSStyleSelectorList::append (this=0x9dfe50, sheet=0x1346f90, medium=0x13f10f0, styleSelector=0x1312290)
    at /build/buildd/kde4libs-4.2.0/khtml/css/cssstyleselector.cpp:2060
#9  0x00007f6f18159fd0 in CSSStyleSelector (this=0x1312290, doc=0x1337040, userStyleSheet=
      {static null = {<No data fields>}, static shared_null = {ref = {_q_value = 25876}, alloc = 0, size = 0, data = 0x7f6f255c52da, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 1138}, alloc = 0, size = 0, data = 0x7f6f255c52fa, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x7fff2fcd3400, static codecForCStrings = 0x0}, styleSheets=0x1315440, url=@0x13370e0, _strictParsing=<value optimized out>)
    at /build/buildd/kde4libs-4.2.0/khtml/css/cssstyleselector.cpp:278
#10 0x00007f6f18004664 in DOM::DocumentImpl::rebuildStyleSelector (this=0x1337040) at /build/buildd/kde4libs-4.2.0/khtml/xml/dom_docimpl.cpp:2385
#11 0x00007f6f18004f0f in DOM::DocumentImpl::recalcStyleSelector (this=0x1337040) at /build/buildd/kde4libs-4.2.0/khtml/xml/dom_docimpl.cpp:2374
#12 0x00007f6f18005c1d in DOM::DocumentImpl::updateStyleSelector (this=0x1337040, shallow=false) at /build/buildd/kde4libs-4.2.0/khtml/xml/dom_docimpl.cpp:2214
#13 0x00007f6f18063f15 in DOM::HTMLStyleElementImpl::childrenChanged (this=0x141fa40) at /build/buildd/kde4libs-4.2.0/khtml/html/html_headimpl.cpp:656
#14 0x00007f6f180115ec in DOM::NodeBaseImpl::addChild (this=0x141fa40, newChild=0x14000e0) at /build/buildd/kde4libs-4.2.0/khtml/xml/dom_nodeimpl.cpp:1709
#15 0x00007f6f1804e8ae in khtml::KHTMLParser::insertNode (this=0x7c5f30, n=0x14000e0, flat=true) at /build/buildd/kde4libs-4.2.0/khtml/html/htmlparser.cpp:415
#16 0x00007f6f180510f7 in khtml::KHTMLParser::parseToken (this=0x7c5f30, t=0x13bc088) at /build/buildd/kde4libs-4.2.0/khtml/html/htmlparser.cpp:303
#17 0x00007f6f18051a04 in khtml::HTMLTokenizer::processToken (this=0x13bc060) at /build/buildd/kde4libs-4.2.0/khtml/html/htmltokenizer.cpp:2053
#18 0x00007f6f180593fe in khtml::HTMLTokenizer::parseSpecial (this=0x13bc060, src=@0x13bc5c8) at /build/buildd/kde4libs-4.2.0/khtml/html/htmltokenizer.cpp:370
#19 0x00007f6f1805b17f in khtml::HTMLTokenizer::parseTag (this=0x13bc060, src=@0x13bc5c8) at /build/buildd/kde4libs-4.2.0/khtml/html/htmltokenizer.cpp:1558
#20 0x00007f6f1805c753 in khtml::HTMLTokenizer::write (this=0x13bc060, str=@0x7fff2fcd4040, appendData=true) at /build/buildd/kde4libs-4.2.0/khtml/html/htmltokenizer.cpp:1807
#21 0x00007f6f17fa13bd in KHTMLPart::write (this=0xf9e7d0, 
    data=0x1341e78 "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\r\n<html xmlns=\"http://www.w3.org/1999/xhtml\">\r\n<head>\r\n<meta http-equiv=\"Conten"..., len=6749) at /build/buildd/kde4libs-4.2.0/khtml/khtml_part.cpp:2070
#22 0x00007f6f17fa36a4 in KHTMLPart::slotData (this=0xf9e7d0, kio_job=<value optimized out>, data=@0x7fff2fcd4920) at /build/buildd/kde4libs-4.2.0/khtml/khtml_part.cpp:1755
#23 0x00007f6f17fc3320 in KHTMLPart::qt_metacall (this=0xf9e7d0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff2fcd4560)
    at /build/buildd/kde4libs-4.2.0/obj-x86_64-linux-gnu/khtml/khtml_part.moc:264
#24 0x00007f6f252f2154 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#25 0x00007f6f26b0b1e4 in KIO::TransferJob::data (this=0x0, _t1=0xfe9ce0, _t2=<value optimized out>) at /build/buildd/kde4libs-4.2.0/obj-x86_64-linux-gnu/kio/jobclasses.moc:356
#26 0x00007f6f26b16089 in KIO::TransferJob::qt_metacall (this=0xfe9ce0, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff2fcd4690)
    at /build/buildd/kde4libs-4.2.0/obj-x86_64-linux-gnu/kio/jobclasses.moc:337
#27 0x00007f6f252f2154 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#28 0x00007f6f26bc5b52 in KIO::SlaveInterface::data (this=0x0, _t1=<value optimized out>) at /build/buildd/kde4libs-4.2.0/obj-x86_64-linux-gnu/kio/slaveinterface.moc:138
#29 0x00007f6f26bc93d8 in KIO::SlaveInterface::dispatch (this=0xd82e70, _cmd=100, rawdata=<value optimized out>) at /build/buildd/kde4libs-4.2.0/kio/kio/slaveinterface.cpp:163
#30 0x00007f6f26bc5e02 in KIO::SlaveInterface::dispatch (this=0xd82e70) at /build/buildd/kde4libs-4.2.0/kio/kio/slaveinterface.cpp:91
#31 0x00007f6f26bb7023 in KIO::Slave::gotInput (this=0xd82e70) at /build/buildd/kde4libs-4.2.0/kio/kio/slave.cpp:322
#32 0x00007f6f26bb9328 in KIO::Slave::qt_metacall (this=0xd82e70, _c=QMetaObject::InvokeMetaMethod, _id=409704752, _a=0x7fff2fcd4a80)
    at /build/buildd/kde4libs-4.2.0/obj-x86_64-linux-gnu/kio/slave.moc:75
#33 0x00007f6f252f2154 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#34 0x00007f6f26adff21 in KIO::ConnectionPrivate::dequeue (this=0x121cec0) at /build/buildd/kde4libs-4.2.0/kio/kio/connection.cpp:82
#35 0x00007f6f26ae037a in KIO::Connection::qt_metacall (this=0xa95940, _c=QMetaObject::InvokeMetaMethod, _id=409704752, _a=0x13156e0)
    at /build/buildd/kde4libs-4.2.0/obj-x86_64-linux-gnu/kio/connection.moc:72
#36 0x00007f6f252ecdc5 in QObject::event () from /usr/lib/libQtCore.so.4
#37 0x00007f6f247ffbfd in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#38 0x00007f6f248079ba in QApplication::notify () from /usr/lib/libQtGui.so.4
#39 0x00007f6f260f25cb in KApplication::notify (this=0x7fff2fcd56b0, receiver=0xa95940, event=0x131a2d0) at /build/buildd/kde4libs-4.2.0/kdeui/kernel/kapplication.cpp:307
#40 0x00007f6f252ddd81 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#41 0x00007f6f252dea1a in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#42 0x00007f6f25306503 in ?? () from /usr/lib/libQtCore.so.4
#43 0x00007f6f2097740b in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#44 0x00007f6f2097abcd in ?? () from /usr/lib/libglib-2.0.so.0
#45 0x00007f6f2097ad8b in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#46 0x00007f6f2530618f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#47 0x00007f6f24891adf in ?? () from /usr/lib/libQtGui.so.4
#48 0x00007f6f252dc6a2 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#49 0x00007f6f252dc82d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#50 0x00007f6f252decdd in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#51 0x00007f6f2788a889 in kdemain (argc=<value optimized out>, argv=<value optimized out>) at /build/buildd/kdebase-4.2.0/apps/konqueror/src/konqmain.cpp:257
#52 0x00007f6f22be15a6 in __libc_start_main () from /lib/libc.so.6
#53 0x00000000004007a9 in _start () at ../sysdeps/x86_64/elf/start.S:113