Application: konqueror (4.4.2 (KDE 4.4.2))
KDE Platform Version: 4.4.2 (KDE 4.4.2)
Qt Version: 4.6.2
Operating System: Linux 2.6.32-22-generic x86_64
Distribution: Ubuntu 10.04 LTS

-- Information about the crash:
After "following" someone on Twitter, using the "Back" keyboard shortcut seems to consistently crash Konqueror when using the WebKit kpart. I haven't tried with khtml.

 -- Backtrace:
Application: Konqueror (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fadf0283760 (LWP 4497))]

Thread 4 (Thread 0x7fade039a710 (LWP 4549)):
#0  0xffffffffff60017b in ?? ()
#1  0x00007fade0399aa0 in ?? ()
#2  0x00007fff4bbf1852 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 3 (Thread 0x7fadcfdab710 (LWP 4617)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007fade5f34ca6 in WTF::TCMalloc_PageHeap::scavengerThread (this=0x7fade6ef6e80) at ../JavaScriptCore/wtf/FastMalloc.cpp:2299
#2  0x00007fade5f34ce9 in WTF::TCMalloc_PageHeap::runScavengerThread (context=0x7fade6f04f4c) at ../JavaScriptCore/wtf/FastMalloc.cpp:1433
#3  0x00007fadee4db9ca in start_thread (arg=<value optimized out>) at pthread_create.c:300
#4  0x00007faded28e6cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fadcbb8a710 (LWP 4798)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007fadd96ba2a6 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7fadd9998220) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2304
#2  0x00007fadd96ba2e9 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=0x7fadd99a62ec) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1438
#3  0x00007fadee4db9ca in start_thread (arg=<value optimized out>) at pthread_create.c:300
#4  0x00007faded28e6cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fadf0283760 (LWP 4497)):
[KCrash Handler]
#5  0x00007fade63b1e99 in WebCore::QNetworkReplyHandler::sendResponseIfNeeded (this=0x25a3c20) at platform/network/qt/QNetworkReplyHandler.cpp:334
#6  0x00007fade63b373d in WebCore::QNetworkReplyHandler::finish (this=0x7fff4bb62740) at platform/network/qt/QNetworkReplyHandler.cpp:220
#7  0x00007fade63b3d54 in WebCore::QNetworkReplyHandler::qt_metacall (this=0x25a3c20, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=<value optimized out>)
    at .moc/release-shared/moc_QNetworkReplyHandler.cpp:82
#8  0x00007fadee86fd49 in QObject::event (this=0x25a3c20, e=0x44f92d0) at kernel/qobject.cpp:1248
#9  0x00007faded9fc22c in QApplicationPrivate::notify_helper (this=0x12a81f0, receiver=0x25a3c20, e=0x44f92d0) at kernel/qapplication.cpp:4300
#10 0x00007fadeda026fb in QApplication::notify (this=0x7fff4bb63780, receiver=0x25a3c20, e=0x44f92d0) at kernel/qapplication.cpp:4183
#11 0x00007fadeeda7526 in KApplication::notify (this=0x7fff4bb63780, receiver=0x25a3c20, event=0x44f92d0) at ../../kdeui/kernel/kapplication.cpp:302
#12 0x00007fadee86006c in QCoreApplication::notifyInternal (this=0x7fff4bb63780, receiver=0x25a3c20, event=0x44f92d0) at kernel/qcoreapplication.cpp:704
#13 0x00007fadee8627e7 in QCoreApplication::sendEvent (receiver=0x0, event_type=<value optimized out>, data=0x1225c30) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#14 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=<value optimized out>, data=0x1225c30) at kernel/qcoreapplication.cpp:1345
#15 0x00007fadee8899d3 in QCoreApplication::sendPostedEvents (s=<value optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#16 postEventSourceDispatch (s=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:276
#17 0x00007fade9c428c2 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#18 0x00007fade9c46748 in ?? () from /lib/libglib-2.0.so.0
#19 0x00007fade9c468fc in g_main_context_iteration () from /lib/libglib-2.0.so.0
#20 0x00007fadee889513 in QEventDispatcherGlib::processEvents (this=0x1227140, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#21 0x00007fadedaac46e in QGuiEventDispatcherGlib::processEvents (this=0x7fff4bb62740, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#22 0x00007fadee85e992 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#23 0x00007fadee85ed6c in QEventLoop::exec (this=0x7fff4bb63480, flags=) at kernel/qeventloop.cpp:201
#24 0x00007fadee862aab in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#25 0x00007fade38ae076 in kdemain () from /usr/lib/libkdeinit4_konqueror.so
#26 0x00000000004070f3 in launch (argc=2, _name=<value optimized out>, args=<value optimized out>, cwd=<value optimized out>, envc=16, envs=<value optimized out>, reset_env=true, tty=0x0, 
    avoid_loops=false, startup_id_str=0x127d56b "0") at ../../kinit/kinit.cpp:717
#27 0x0000000000407cb0 in handle_launcher_request (sock=25, who=<value optimized out>) at ../../kinit/kinit.cpp:1209
#28 0x0000000000408219 in handle_requests (waitForPid=0) at ../../kinit/kinit.cpp:1393
#29 0x0000000000408e22 in main (argc=4, argv=<value optimized out>, envp=<value optimized out>) at ../../kinit/kinit.cpp:1845

Reported using DrKonqi