Version:           4.2.2 (KDE 4.2.2) (using 4.2.2 (KDE 4.2.2), Kubuntu packages)
Compiler:          cc
OS:                Linux (x86_64) release 2.6.28-11-generic

Procedure: 
Load http://www.tuxradar.com/content/ubuntu-904-32-bit-vs-64-bit-benchmarks
Quick-search for "opera". I enter /op and konqueror crashed when I hit 'e'.

Crash is reliably reproducable.

Debug Backtrace:

Application: Konqueror (konqueror), signal SIGSEGV
0x00007f7910447d21 in nanosleep () from /lib/libc.so.6
[Current thread is 0 (LWP 4735)]

Thread 3 (Thread 0x7f7902c9d950 (LWP 4736)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:217
#1  0x00007f7912ac1917 in QWaitCondition::wait (this=0x16d3ed8, mutex=0x16d3ed0, time=30000) at thread/qwaitcondition_unix.cpp:85
#2  0x00007f7912ab7409 in QThreadPoolThread::run (this=0xe4d1f0) at concurrent/qthreadpool.cpp:140
#3  0x00007f7912ac0952 in QThreadPrivate::start (arg=0xe4d1f0) at thread/qthread_unix.cpp:189
#4  0x00007f790f2273ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f7910485fcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f790249c950 (LWP 4737)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:217
#1  0x00007f7912ac1917 in QWaitCondition::wait (this=0x16d3ed8, mutex=0x16d3ed0, time=30000) at thread/qwaitcondition_unix.cpp:85
#2  0x00007f7912ab7409 in QThreadPoolThread::run (this=0x16e55f0) at concurrent/qthreadpool.cpp:140
#3  0x00007f7912ac0952 in QThreadPrivate::start (arg=0x16e55f0) at thread/qthread_unix.cpp:189
#4  0x00007f790f2273ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f7910485fcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()
Current language:  auto; currently asm

Thread 1 (Thread 0x7f79155af750 (LWP 4735)):
[KCrash Handler]
#5  KHTMLFindBar::pattern (this=0x0) at /build/buildd/kde4libs-4.2.2/khtml/find/khtmlfindbar.cpp:105
#6  0x00007f7905c27fd2 in KHTMLFind::activate (this=0x18b9e08) at /build/buildd/kde4libs-4.2.2/khtml/find/khtmlfind.cpp:231
#7  0x00007f7905c2a12c in KHTMLFind::findTextNext (this=0x18b9e08, reverse=false) at /build/buildd/kde4libs-4.2.2/khtml/find/khtmlfind.cpp:277
#8  0x00007f7905c29cc6 in KHTMLFind::findTextNext (this=0x13d9278, reverse=false) at /build/buildd/kde4libs-4.2.2/khtml/find/khtmlfind.cpp:435
#9  0x00007f7905bb5888 in KHTMLView::findAhead (this=0x13d85b0, increase=true) at /build/buildd/kde4libs-4.2.2/khtml/khtmlview.cpp:1979
#10 0x00007f7905bb5f6d in KHTMLView::keyPressEvent (this=0x13d85b0, _ke=0x7fff1d5e0120) at /build/buildd/kde4libs-4.2.2/khtml/khtmlview.cpp:1768
#11 0x00007f791203d86a in QWidget::event (this=0x13d85b0, event=0x7fff1d5e0120) at kernel/qwidget.cpp:7551
#12 0x00007f79123d76eb in QFrame::event (this=0x13d85b0, e=0x7fff1d5e0120) at widgets/qframe.cpp:559
#13 0x00007f7912468c29 in QAbstractScrollArea::event (this=0x13d85b0, e=0x7fff1d5e0120) at widgets/qabstractscrollarea.cpp:918
#14 0x00007f7905bb4591 in KHTMLView::event (this=0x13d85b0, e=0x7fff1d5e0120) at /build/buildd/kde4libs-4.2.2/khtml/khtmlview.cpp:587
#15 0x00007f7911fec83d in QApplicationPrivate::notify_helper (this=0xd0d4b0, receiver=0x13d85b0, e=0x7fff1d5e0120) at kernel/qapplication.cpp:4084
#16 0x00007f7911ff596f in QApplication::notify (this=<value optimized out>, receiver=0x13d85b0, e=0x7fff1d5e0120) at kernel/qapplication.cpp:3690
#17 0x00007f79139dd26b in KApplication::notify (this=0x7fff1d5e14b0, receiver=0x13d85b0, event=0x7fff1d5e0120) at /build/buildd/kde4libs-4.2.2/kdeui/kernel/kapplication.cpp:307
#18 0x00007f7912ba975c in QCoreApplication::notifyInternal (this=0x7fff1d5e14b0, receiver=0x13d85b0, event=0x7fff1d5e0120) at kernel/qcoreapplication.cpp:602
#19 0x00007f7912081764 in QKeyMapper::sendKeyEvent (keyWidget=0x13d85b0, grab=<value optimized out>, type=QEvent::KeyPress, code=69, modifiers={i = 492700496}, text=@0x7fff1d5e0340, 
    autorepeat=false, count=1, nativeScanCode=26, nativeVirtualKey=101, nativeModifiers=0) at kernel/qkeymapper_x11.cpp:1675
#20 0x00007f7912083ac2 in QKeyMapperPrivate::translateKeyEvent (this=0xd46760, keyWidget=0x13d85b0, event=0x7fff1d5e0f10, grab=false) at kernel/qkeymapper_x11.cpp:1645
#21 0x00007f791205c66d in QApplication::x11ProcessEvent (this=0x7fff1d5e14b0, event=0x7fff1d5e0f10) at kernel/qapplication_x11.cpp:3436
#22 0x00007f7912085514 in x11EventSourceDispatch (s=0xd11170, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#23 0x00007f790e14920a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#24 0x00007f790e14c8e0 in ?? () from /usr/lib/libglib-2.0.so.0
#25 0x00007f790e14ca7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#26 0x00007f7912bd2e6f in QEventDispatcherGlib::processEvents (this=0xcf8bd0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:323
#27 0x00007f7912084c9f in QGuiEventDispatcherGlib::processEvents (this=0x7fff1d5df000, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#28 0x00007f7912ba8002 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 492704256}) at kernel/qeventloop.cpp:149
#29 0x00007f7912ba83cd in QEventLoop::exec (this=0x7fff1d5e1240, flags={i = 492704336}) at kernel/qeventloop.cpp:200
#30 0x00007f7912baa694 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:880
#31 0x00007f79151965c9 in kdemain () from /usr/lib/libkdeinit4_konqueror.so
#32 0x00007f79103be5a6 in __libc_start_main (main=0x400870 <_start+240>, argc=2, ubp_av=0x7fff1d5e1f28, init=0x4008a0 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fff1d5e1f18) at libc-start.c:220
#33 0x00000000004007a9 in _start ()
#0  0x00007f7910447d21 in nanosleep () from /lib/libc.so.6
Current language:  auto; currently c