Application that crashed: konqueror
Version of the application: 4.3.00 (KDE 4.3.0)
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
GNU/Linux distribution : Ubuntu 9.04 Jaunty with KDE PPA activated
KDE : 4.3.0

To reproduce : go to acid3.acidtests.org

Symptoms : Sometimes, the webpage tell you you have to enable scripting languages. I found it is random on my system... And some other times, it starts the test and crash Konqueror (crash ~ 20-30/100).

 -- Backtrace:
Application: Konqueror (konqueror), signal: Segmentation fault
[Current thread is 0 (LWP 5557)]

Thread 3 (Thread 0x7f9d54ec9950 (LWP 14858)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:217
#1  0x00007f9d68e33cf7 in QWaitCondition::wait (this=0x164de98, mutex=0x164de90, time=30000) at thread/qwaitcondition_unix.cpp:85
#2  0x00007f9d68e29929 in QThreadPoolThread::run (this=0x126a750) at concurrent/qthreadpool.cpp:140
#3  0x00007f9d68e32d35 in QThreadPrivate::start (arg=0x126a750) at thread/qthread_unix.cpp:188
#4  0x00007f9d656053ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f9d66868fcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f9d55794950 (LWP 14865)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:217
#1  0x00007f9d68e33cf7 in QWaitCondition::wait (this=0x164de98, mutex=0x164de90, time=30000) at thread/qwaitcondition_unix.cpp:85
#2  0x00007f9d68e29929 in QThreadPoolThread::run (this=0x123e720) at concurrent/qthreadpool.cpp:140
#3  0x00007f9d68e32d35 in QThreadPrivate::start (arg=0x123e720) at thread/qthread_unix.cpp:188
#4  0x00007f9d656053ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f9d66868fcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f9d6b92c750 (LWP 5557)):
[KCrash Handler]
#5  QColormap (this=0x7fff7396cd50, colormap=@0xe) at painting/qcolormap_x11.cpp:607
#6  0x00007f9d6855073f in QColormap::instance (screen=1) at painting/qcolormap_x11.cpp:596
#7  0x00007f9d5bf1b509 in colorMediaFeatureEval (value=0x2a5ba20, part=<value optimized out>, op=MinPrefix) at /build/buildd/kde4libs-4.3.0/khtml/css/css_mediaquery.cpp:397
#8  0x00007f9d5bf1f0c2 in khtml::MediaQueryEvaluator::eval (this=0x29aa2c0, expr=0x29b6ce0) at /build/buildd/kde4libs-4.3.0/khtml/css/css_mediaquery.cpp:774
#9  0x00007f9d5bf1f1f6 in khtml::MediaQueryEvaluator::eval (this=0x29aa2c0, mediaList=0x20541b0, styleSelector=0x27bdd40) at /build/buildd/kde4libs-4.3.0/khtml/css/css_mediaquery.cpp:296
#10 0x00007f9d5bef9077 in khtml::CSSStyleSelectorList::append (this=0x2a5bb70, sheet=0xf57fd0, medium=0x29aa2c0, styleSelector=0x27bdd40)
    at /build/buildd/kde4libs-4.3.0/khtml/css/cssstyleselector.cpp:2065
#11 0x00007f9d5bf08be0 in CSSStyleSelector (this=0x27bdd40, doc=0x22f1990, userStyleSheet=
      {static null = {<No data fields>}, static shared_null = {ref = {_q_value = 42114}, alloc = 0, size = 0, data = 0x7f9d6920f83a, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, static shared_empty = {ref = {_q_value = 1399}, alloc = 0, size = 0, data = 0x7f9d6920f85a, clean = 0, simpletext = 0, righttoleft = 0, asciiCache = 0, capacity = 0, reserved = 0, array = {0}}, d = 0x7fff7396d040, static codecForCStrings = 0x0}, styleSheets=0x1ba2330, url=@0x22f1a40, _strictParsing=<value optimized out>)
    at /build/buildd/kde4libs-4.3.0/khtml/css/cssstyleselector.cpp:282
#12 0x00007f9d5bdb809c in DOM::DocumentImpl::rebuildStyleSelector (this=0x22f1990) at /build/buildd/kde4libs-4.3.0/khtml/xml/dom_docimpl.cpp:2393
#13 0x00007f9d5bdb8205 in DOM::DocumentImpl::updateStyleSelector (this=0x22f1990, shallow=14) at /build/buildd/kde4libs-4.3.0/khtml/xml/dom_docimpl.cpp:2212
#14 0x00007f9d5bdc2c6b in DOM::NodeBaseImpl::dispatchChildInsertedEvents (this=0x2e5ae90, child=0x1e5df70, exceptioncode=@0x7fff7396d2e8)
    at /build/buildd/kde4libs-4.3.0/khtml/xml/dom_nodeimpl.cpp:2013
#15 0x00007f9d5bdc3277 in DOM::NodeBaseImpl::appendChild (this=0x2e5ae90, newChild=0x1e5df70, exceptioncode=@0x7fff7396d2e8) at /build/buildd/kde4libs-4.3.0/khtml/xml/dom_nodeimpl.cpp:1730
#16 0x00007f9d5bf66662 in DOMNodeProtoFunc::callAsFunction (this=<value optimized out>, exec=0x7fff7396dd60, thisObj=<value optimized out>, args=@0x7fff7396dcb0)
    at /build/buildd/kde4libs-4.3.0/khtml/ecma/kjs_dom.cpp:641
#17 0x00007f9d5b8f87b9 in KJS::JSObject::call (this=0x7fff7396cd50, exec=0xc07, thisObj=0x8c0220, args=@0xc3954) at /build/buildd/kde4libs-4.3.0/kjs/object.cpp:69
#18 0x00007f9d5b913831 in KJS::Machine::runBlock (exec=0x7fff7396dd60, codeBlock=<value optimized out>, parentExec=0x7fff7396e850) at codes.def:1192
#19 0x00007f9d5b8f4d1f in KJS::FunctionImp::callAsFunction (this=0x7f9d6076e200, exec=0x7fff7396e850, thisObj=<value optimized out>, args=@0x7fff7396e7a0)
    at /build/buildd/kde4libs-4.3.0/kjs/function.cpp:144
#20 0x00007f9d5b8f87b9 in KJS::JSObject::call (this=0x7fff7396cd50, exec=0xc07, thisObj=0x8c0220, args=@0xc3954) at /build/buildd/kde4libs-4.3.0/kjs/object.cpp:69
#21 0x00007f9d5b913831 in KJS::Machine::runBlock (exec=0x7fff7396e850, codeBlock=<value optimized out>, parentExec=0x1f63900) at codes.def:1192
#22 0x00007f9d5b8f4d1f in KJS::FunctionImp::callAsFunction (this=0x7f9d6076cdc0, exec=0x1f63900, thisObj=<value optimized out>, args=@0x1733928) at /build/buildd/kde4libs-4.3.0/kjs/function.cpp:144
#23 0x00007f9d5b8f87b9 in KJS::JSObject::call (this=0x7fff7396cd50, exec=0xc07, thisObj=0x8c0220, args=@0xc3954) at /build/buildd/kde4libs-4.3.0/kjs/object.cpp:69
#24 0x00007f9d5bf96e32 in KJS::ScheduledAction::execute (this=0x1733920, window=0x7f9d60770080) at /build/buildd/kde4libs-4.3.0/khtml/ecma/kjs_window.cpp:2180
#25 0x00007f9d5bf988d6 in KJS::WindowQObject::timerEvent (this=0x1adf950) at /build/buildd/kde4libs-4.3.0/khtml/ecma/kjs_window.cpp:2356
#26 0x00007f9d68f2c263 in QObject::event (this=0x1adf950, e=0xe) at kernel/qobject.cpp:1075
#27 0x00007f9d68399f4d in QApplicationPrivate::notify_helper (this=0x8b70c0, receiver=0x1adf950, e=0x7fff7396f1b0) at kernel/qapplication.cpp:4056
#28 0x00007f9d683a218a in QApplication::notify (this=0x7fff7396f6e0, receiver=0x1adf950, e=0x7fff7396f1b0) at kernel/qapplication.cpp:4021
#29 0x00007f9d69d5e71b in KApplication::notify (this=0x7fff7396f6e0, receiver=0x1adf950, event=0x7fff7396f1b0) at /build/buildd/kde4libs-4.3.0/kdeui/kernel/kapplication.cpp:302
#30 0x00007f9d68f1c6ac in QCoreApplication::notifyInternal (this=0x7fff7396f6e0, receiver=0x1adf950, event=0x7fff7396f1b0) at kernel/qcoreapplication.cpp:610
#31 0x00007f9d68f49516 in QTimerInfoList::activateTimers (this=0x8bae00) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#32 0x00007f9d68f45b2d in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:165
#33 0x00007f9d6432320a in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#34 0x00007f9d643268e0 in ?? () from /usr/lib/libglib-2.0.so.0
#35 0x00007f9d64326a7c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#36 0x00007f9d68f45a8f in QEventDispatcherGlib::processEvents (this=0x899b50, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#37 0x00007f9d68432bdf in QGuiEventDispatcherGlib::processEvents (this=0x7fff7396cd50, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#38 0x00007f9d68f1af42 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 1939272736}) at kernel/qeventloop.cpp:149
#39 0x00007f9d68f1b314 in QEventLoop::exec (this=0x7fff7396f460, flags={i = 1939272816}) at kernel/qeventloop.cpp:201
#40 0x00007f9d68f1d5e4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#41 0x00007f9d6b521d02 in kdemain () from /usr/lib/libkdeinit4_konqueror.so
#42 0x00007f9d667a15a6 in __libc_start_main (main=0x400870 <_start+240>, argc=3, ubp_av=0x7fff73970228, init=0x4008a0 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fff73970218) at libc-start.c:220
#43 0x00000000004007a9 in _start ()

Reported using DrKonqi