BT :

Application: Konqueror (konqueror), signal SIGSEGV
[Thread debugging using libthread_db enabled]
[New Thread 0xb61ac720 (LWP 22369)]
[KCrash handler]
#6  0xb3fb5fb6 in khtml::TreeShared<DOM::NodeImpl>::ref (this=0x0)
    at /media/kde/src/KDE/kdelibs/khtml/misc/shared.h:61
#7  0xb40321d1 in NodeListImpl (this=0xbf8d7b80, n=0x0, type=15, 
    factory=0xb408db30 <CollectionCache::make()>)
    at /media/kde/src/KDE/kdelibs/khtml/xml/dom_nodeimpl.cpp:2021
#8  0xb408d05d in HTMLCollectionImpl (this=0xbf8d7b80, _base=0x0, _type=15)
    at /media/kde/src/KDE/kdelibs/khtml/html/html_miscimpl.cpp:70
#9  0xb41e1b4f in KJS::FrameArray::getOwnPropertySlot (this=0xb1a3b0c0, 
    exec=0xbf8d883c, propertyName=@0xbf8d876c, slot=@0xbf8d7c10)
    at /media/kde/src/KDE/kdelibs/khtml/ecma/kjs_window.cpp:2570
#10 0xb449e03a in KJS::JSObject::getPropertySlot (this=0xb1a3b0c0, 
    exec=0xbf8d883c, propertyName=@0xbf8d876c, slot=@0xbf8d7c10)
    at /media/kde/src/KDE/kdelibs/kjs/object.h:584
#11 0xb449c8fa in KJS::JSObject::get (this=0xb1a3b0c0, exec=0xbf8d883c, 
    propertyName=@0xbf8d876c) at /media/kde/src/KDE/kdelibs/kjs/object.cpp:165
#12 0xb44b7122 in KJS::Machine::runBlock (exec=0xbf8d883c, block=@0xa21a58c)
    at codes.def:705
#13 0xb4465f61 in KJS::FunctionBodyNode::execute (this=0xa21a538, 
    exec=0xbf8d883c) at /media/kde/src/KDE/kdelibs/kjs/nodes.cpp:989
#14 0xb4498ecf in KJS::FunctionImp::callAsFunction (this=0xb1a3dcc0, 
    exec=0xbf8d955c, thisObj=0xb1a3dda0, args=@0xbf8d94c8)
    at /media/kde/src/KDE/kdelibs/kjs/function.cpp:127
#15 0xb449d00d in KJS::JSObject::call (this=0xb1a3dcc0, exec=0xbf8d955c, 
    thisObj=0xb1a3dda0, args=@0xbf8d94c8)
    at /media/kde/src/KDE/kdelibs/kjs/object.cpp:99
#16 0xb44bf4e3 in KJS::Machine::runBlock (exec=0xbf8d955c, block=@0xa44dd04)
    at codes.def:1163
#17 0xb4465f61 in KJS::FunctionBodyNode::execute (this=0xa44dcb0, 
    exec=0xbf8d955c) at /media/kde/src/KDE/kdelibs/kjs/nodes.cpp:989
#18 0xb4498ecf in KJS::FunctionImp::callAsFunction (this=0xb1a3dae0, 
    exec=0xbf8da27c, thisObj=0xb1a40000, args=@0xbf8da1e8)
    at /media/kde/src/KDE/kdelibs/kjs/function.cpp:127
#19 0xb449d00d in KJS::JSObject::call (this=0xb1a3dae0, exec=0xbf8da27c, 
    thisObj=0xb1a40000, args=@0xbf8da1e8)
    at /media/kde/src/KDE/kdelibs/kjs/object.cpp:99
#20 0xb44bf4e3 in KJS::Machine::runBlock (exec=0xbf8da27c, block=@0xa116dc4)
    at codes.def:1163
#21 0xb4465f61 in KJS::FunctionBodyNode::execute (this=0xa116d70, 
    exec=0xbf8da27c) at /media/kde/src/KDE/kdelibs/kjs/nodes.cpp:989
#22 0xb4498ecf in KJS::FunctionImp::callAsFunction (this=0xb1a3cf60, 
    exec=0xa152140, thisObj=0xb1a40000, args=@0xa4a0d9c)
    at /media/kde/src/KDE/kdelibs/kjs/function.cpp:127
#23 0xb449d00d in KJS::JSObject::call (this=0xb1a3cf60, exec=0xa152140, 
    thisObj=0xb1a40000, args=@0xa4a0d9c)
    at /media/kde/src/KDE/kdelibs/kjs/object.cpp:99
#24 0xb41e2bb3 in KJS::ScheduledAction::execute (this=0xa4a0d98, 
    window=0xb1a40000)
    at /media/kde/src/KDE/kdelibs/khtml/ecma/kjs_window.cpp:2179
#25 0xb41e2e41 in KJS::WindowQObject::timerEvent (this=0x887aa00)
    at /media/kde/src/KDE/kdelibs/khtml/ecma/kjs_window.cpp:2355
#26 0xb74d5b64 in QObject::event (this=0x887aa00, e=0xbf8da984)
    at kernel/qobject.cpp:1105
#27 0xb6947269 in QApplicationPrivate::notify_helper (this=0x82fabf8, 
    receiver=0x887aa00, e=0xbf8da984) at kernel/qapplication.cpp:3772
#28 0xb694757e in QApplication::notify (this=0xbf8dadec, receiver=0x887aa00, 
    e=0xbf8da984) at kernel/qapplication.cpp:3366
#29 0xb7ae8f81 in KApplication::notify (this=0xbf8dadec, receiver=0x887aa00, 
    event=0xbf8da984)
    at /media/kde/src/KDE/kdelibs/kdeui/kernel/kapplication.cpp:311
#30 0xb74c326b in QCoreApplication::notifyInternal (this=0xbf8dadec, 
    receiver=0x887aa00, event=0xbf8da984) at kernel/qcoreapplication.cpp:583
#31 0xb74c6db3 in QCoreApplication::sendEvent (receiver=0x887aa00, 
    event=0xbf8da984) at kernel/qcoreapplication.h:215
#32 0xb74f4273 in QTimerInfoList::activateTimers (this=0x82fdb34)
    at kernel/qeventdispatcher_unix.cpp:563
#33 0xb74f1b84 in timerSourceDispatch (source=0x82fdb00)
    at kernel/qeventdispatcher_glib.cpp:166
#34 0xb63f0978 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#35 0xb63f3bce in ?? () from /usr/lib/libglib-2.0.so.0
#36 0x082fce38 in ?? ()
#37 0x00000000 in ?? ()
#0  0xb7fbf430 in __kernel_vsyscall ()

kdelibs rev. 821568. 

The BT is the same as one found when triaging konqueror bugs (bug 127147 see the last comment).

hm rev 822278, doesnt crash here

r823211 doesn't crash (zarvox)
r824521 doesn't crash (Med)
(It crashes for me, but I've screwed up my build, I think.)

*** This bug has been marked as a duplicate of 127147 ***

Or I'm not on crack, Maksim says its timing dependant. So bug still valid.

*** Bug 169041 has been marked as a duplicate of this bug. ***

Let's keep it separate from back button issues, which trigger this bug due to a different one..

*** Bug 166056 has been marked as a duplicate of this bug. ***

*** Bug 127147 has been marked as a duplicate of this bug. ***

Anyway, looks like I forgot to merge in the initial fix into 4.0.x;
but this will likely get fixed cleaner by just getting rid of FrameArray in the first place. 

http://lists.kde.org/?l=kde-commits&m=121951751204127&w=2

*** Bug 169729 has been marked as a duplicate of this bug. ***