Version:            (using KDE 4.3.2)
OS:                Linux
Installed from:    Ubuntu Packages

Konqueror froze while I was browsing the web. It would redraw itself occasionally, but was unresponsive most of the time.

GDB shows that Konqueror was making blocking DBUS calls:

#0  0x00b10422 in __kernel_vsyscall ()                                                                                                                          
#1  0x059cfba6 in *__GI___poll (fds=0x5a50ff4, nfds=1, timeout=25000) at ../sysdeps/unix/sysv/linux/poll.c:87                                                   
#2  0x02e730fb in ?? () from /lib/libdbus-1.so.3                                                                                                                
#3  0x02e6b0cf in ?? () from /lib/libdbus-1.so.3                                                                                                                
#4  0x02e692ec in ?? () from /lib/libdbus-1.so.3                                                                                                                
#5  0x02e53bf3 in ?? () from /lib/libdbus-1.so.3                                                                                                                
#6  0x02e56254 in ?? () from /lib/libdbus-1.so.3                                                                                                                
#7  0x02e63a71 in dbus_pending_call_block () from /lib/libdbus-1.so.3                                                                                           
#8  0x0381e1dd in q_dbus_pending_call_block (this=0x8fdae30, pcall=0xa2d8388) at ./qdbus_symbols_p.h:298                                                        
#9  QDBusConnectionPrivate::waitForFinished (this=0x8fdae30, pcall=0xa2d8388) at qdbusintegrator.cpp:1647                                                       
#10 0x0385f1f8 in QDBusPendingCallPrivate::waitForFinished (this=0xa2d8388) at qdbuspendingcall.cpp:236                                                         
#11 0x02286e3e in QDBusReply<QString>::operator= (this=0xad50560) at /usr/include/qt4/QtDBus/qdbusreply.h:86                                                    
#12 QDBusReply (this=0xad50560) at /usr/include/qt4/QtDBus/qdbusreply.h:91                                                                                      
#13 DOM::HTMLDocumentImpl::cookie (this=0xad50560) at ../../khtml/html/html_documentimpl.cpp:106                                                                
#14 0x023f57e0 in KJS::HTMLDocument::getValueProperty (this=0xb65cfc40, exec=0xbfd11410, token=5) at ../../khtml/ecma/kjs_html.cpp:367                          
#15 0x0894bd1c in KJS::PropertySlot::getValue (this=0xb65cfc40, exec=0xbfd11410, propertyName=...) at ../../kjs/property_slot.h:46                              
#16 KJS::JSObject::get (this=0xb65cfc40, exec=0xbfd11410, propertyName=...) at ../../kjs/object.cpp:132                                                         
#17 0x08962538 in KJS::Machine::runBlock (exec=0xbfd11410, codeBlock=..., parentExec=0xbfd11890) at codes.def:673                                               
#18 0x089487cb in KJS::FunctionImp::callAsFunction (this=0xb65c0a60, exec=0xbfd11890, thisObj=0xb65d0040, args=...) at ../../kjs/function.cpp:144               
#19 0x0894c3fd in KJS::JSObject::call (this=0x1, exec=0xbfd11890, thisObj=0xb65d0040, args=...) at ../../kjs/object.cpp:69                                      
#20 0x0896a65a in KJS::Machine::runBlock (exec=0xbfd11890, codeBlock=..., parentExec=0xbfd11d10) at codes.def:1192                                              
#21 0x089487cb in KJS::FunctionImp::callAsFunction (this=0xb2784a00, exec=0xbfd11d10, thisObj=0xb65d0040, args=...) at ../../kjs/function.cpp:144               
#22 0x0894c3fd in KJS::JSObject::call (this=0x1, exec=0xbfd11d10, thisObj=0xb65d0040, args=...) at ../../kjs/object.cpp:69                                      
#23 0x0896a65a in KJS::Machine::runBlock (exec=0xbfd11d10, codeBlock=..., parentExec=0xbfd121f0) at codes.def:1192                                              
#24 0x089487cb in KJS::FunctionImp::callAsFunction (this=0xb2784580, exec=0xbfd121f0, thisObj=0xb65d0040, args=...) at ../../kjs/function.cpp:144               
#25 0x0894c3fd in KJS::JSObject::call (this=0x1, exec=0xbfd121f0, thisObj=0xb65d0040, args=...) at ../../kjs/object.cpp:69                                      
#26 0x0896a65a in KJS::Machine::runBlock (exec=0xbfd121f0, codeBlock=..., parentExec=0x0) at codes.def:1192                                                     
#27 0x0891a0aa in KJS::FunctionBodyNode::execute (this=0xa10a458, exec=0xbfd121f0) at ../../kjs/nodes.cpp:928                                                   
#28 0x0894f622 in KJS::Interpreter::evaluate (this=0x9c8a100, sourceURL=..., startingLineNumber=1, code=0xa459288, codeLength=14, thisV=0xb65d0040)             
    at ../../kjs/interpreter.cpp:556                                                                                                                            
#29 0x0894f817 in KJS::Interpreter::evaluate (this=0x9c8a100, sourceURL=..., startingLineNumber=1, code=..., thisV=0xb65d0040) at ../../kjs/interpreter.cpp:496
#30 0x0243004f in KJS::KJSProxyImpl::evaluate (this=0xa1ef0b0, filename=..., baseLine=1, str=..., n=..., completion=0xbfd123f8)
    at ../../khtml/ecma/kjs_proxy.cpp:158
#31 0x021bfb59 in KHTMLPart::executeScript (this=0xa8c4698, n=..., script=...) at ../../khtml/khtml_part.cpp:1376
#32 0x02415374 in KJS::ScheduledAction::execute (this=0xa011280, window=0xb65d0040) at ../../khtml/ecma/kjs_window.cpp:2196
#33 0x02416e82 in KJS::WindowQObject::timerEvent (this=0xa871898) at ../../khtml/ecma/kjs_window.cpp:2362
#34 0x003dc3bf in QObject::event (this=0xa871898, e=0xbfd12950) at kernel/qobject.cpp:1075
#35 0x0109bf54 in QApplicationPrivate::notify_helper (this=0x8f804b8, receiver=0xa871898, e=0xbfd12950) at kernel/qapplication.cpp:4056
#36 0x010a367c in QApplication::notify (this=0xbfd12d54, receiver=0xa871898, e=0xbfd12950) at kernel/qapplication.cpp:3603
#37 0x00dbbbba in KApplication::notify (this=0xbfd12d54, receiver=0xa871898, event=0xbfd12950) at ../../kdeui/kernel/kapplication.cpp:302
#38 0x003cc6cb in QCoreApplication::notifyInternal (this=0xbfd12d54, receiver=0xa871898, event=0xbfd12950) at kernel/qcoreapplication.cpp:610
#39 0x003f97ce in QCoreApplication::sendEvent (this=0x8f83474) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#40 QTimerInfoList::activateTimers (this=0x8f83474) at kernel/qeventdispatcher_unix.cpp:572
#41 0x003f70e0 in timerSourceDispatch (source=0x8f83440) at kernel/qeventdispatcher_glib.cpp:165
#42 0x00b49e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#43 0x00b4d720 in ?? () from /lib/libglib-2.0.so.0
#44 0x00b4d853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#45 0x003f702c in QEventDispatcherGlib::processEvents (this=0x8ef7a58, flags=...) at kernel/qeventdispatcher_glib.cpp:327
#46 0x0113cbe5 in QGuiEventDispatcherGlib::processEvents (this=0x8ef7a58, flags=...) at kernel/qguieventdispatcher_glib.cpp:202
#47 0x003cac79 in QEventLoop::processEvents (this=0xbfd12c14, flags=DWARF-2 expression error: DW_OP_reg operations must be used either alone or in conjuction with DW_OP_piece.
) at kernel/qeventloop.cpp:149
#48 0x003cb0ca in QEventLoop::exec (this=0xbfd12c14, flags=...) at kernel/qeventloop.cpp:201
#49 0x003cd53f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#50 0x0109bdd7 in QApplication::exec () at kernel/qapplication.cpp:3525
#51 0x01dfe5bf in kdemain () from /usr/lib/libkdeinit4_konqueror.so
#52 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=0, envs=0x8f4528d "",
    reset_env=false, tty=0x0, avoid_loops=false, startup_id_str=0x80511a5 "0") at ../../kinit/kinit.cpp:677
#53 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#54 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#55 0x0804fbaf in main (argc=2, argv=0xbfd137a4, envp=0xbfd137b0) at ../../kinit/kinit.cpp:1793