I was using a cvs build from Fri Nov 5 on a RedHat 5.2 system when I got this crash. Gtk-WARNING **: invalid cast from (NULL) pointer to `GtkWidget' Segmentation fault Inside widget/src/gtk/nsWidget.cpp I pressed the little "Mozilla" button in the middle of the bottom of the screen and got a SIGSEV. The SIGSEV happens on line 1800 because the rollupWidget gets set to NULL because NULL is returned by the GTK_WIDGET() call. 1784 /* virtual */ void 1785 nsWidget::OnButtonPressSignal(GdkEventButton * aGdkButtonEvent) 1786 { 1787 nsMouseEvent event; 1788 PRUint32 eventType = 0; 1789 1790 #if defined(DEBUG_pavlov) || defined(DEBUG_akkana) 1791 printf("button press\n"); 1792 #endif 1793 1794 if (gRollupWidget && gRollupListener) 1795 { 1796 GtkWidget *rollupWidget = GTK_WIDGET(gRollupWidget->GetNativeData(NS_NATIVE_WIDGET)); 1797 1798 gint x, y; 1799 gint w, h; 1800 gdk_window_get_origin(rollupWidget->window, &x, &y); 1801 1802 gdk_window_get_size(rollupWidget->window, &w, &h); 1803 1804 1805 if (!(aGdkButtonEvent->x_root > x && 1806 aGdkButtonEvent->x_root < x + w && 1807 aGdkButtonEvent->y_root > y && 1808 aGdkButtonEvent->y_root < y + h)) 1809 { 1810 gRollupListener->Rollup(); 1811 printf("rolling up\n"); 1812 return; 1813 } 1814 } Here is the stack trace. (gdb) bt #0 0x404b4416 in nsWidget::OnButtonPressSignal (this=0x82a64b0, aGdkButtonEvent=0x81021c0) at ../../../../widget/src/gtk/nsWidget.cpp:1800 #1 0x404b53b2 in nsWidget::ButtonPressSignal (aWidget=0x82a66d8, aGdkButtonEvent=0x81021c0, aData=0x82a64b0) at ../../../../widget/src/gtk/nsWidget.cpp:2330 #2 0x405c8a99 in gtk_marshal_BOOL__POINTER (object=0x82a66d8, func=0x404b52d4 <nsWidget::ButtonPressSignal(_GtkWidget *, _GdkEventButton *, void *)>, func_data=0x82a64b0, args=0xbffff380) at gtkmarshal.c:30 #3 0x4058dc52 in gtk_handlers_run (handlers=0x8123608, signal=0xbffff33c, object=0x82a66d8, params=0xbffff380, after=0) at gtksignal.c:1909 #4 0x4058d158 in gtk_signal_real_emit (object=0x82a66d8, signal_id=20, params=0xbffff380) at gtksignal.c:1469 #5 0x4058b468 in gtk_signal_emit (object=0x82a66d8, signal_id=20) at gtksignal.c:552 #6 0x405c0110 in gtk_widget_event (widget=0x82a66d8, event=0x81021c0) at gtkwidget.c:2790 #7 0x4056013d in gtk_propagate_event (widget=0x82a66d8, event=0x81021c0) at gtkmain.c:1296 #8 0x4055f472 in gtk_main_do_event (event=0x81021c0) at gtkmain.c:753 #9 0x40604ed6 in gdk_event_dispatch (source_data=0x0, current_time=0xbffff700, user_data=0x0) at gdkevents.c:2098 #10 0x4062dc8f in g_main_dispatch (current_time=0xbffff700) at gmain.c:652 #11 0x4062e277 in g_main_iterate (block=1, dispatch=1) at gmain.c:870 #12 0x4062e3f9 in g_main_run (loop=0x81adf20) at gmain.c:928 #13 0x4055eedf in gtk_main () at gtkmain.c:475 #14 0x4049d80f in nsAppShell::Run (this=0x80a0ab0) at ../../../../widget/src/gtk/nsAppShell.cpp:395 #15 0x4032a031 in nsAppShellService::Run (this=0x809fdb8) at ../../../../xpfe/appshell/src/nsAppShellService.cpp:480 #16 0x804c85c in main1 (argc=1, argv=0xbffff914) at ../../../xpfe/bootstrap/nsAppRunner.cpp:577 #17 0x804cae9 in main (argc=1, argv=0xbffff914) at ../../../xpfe/bootstrap/nsAppRunner.cpp:667 I am also going to attach a png of the button I pressed.

5.2 is not the supported RedHat version for mozilla. It is 6.0, please upgrade your system. Setting this bug to Verified/Invalid.

I do not mean to sound like a jerk or anything, but to ignore my bug report because you do not like my system is not the right way to interact with the user community. The problem is not my system, this crash is the result of an unchecked null pointer in mozilla code. I know about bug 8849 and the related issues, AND THIS IS NOT ONE OF THEM! I am re-opening this bug.

claudius, try this on Redhat 6.0. If bug does not occurs, then please Verify/ Won't Fix. dejong@cs.umn.edu - I did not ignore. I explained my action. If you do not have 6.0, no problemo. We'll give it a try over here. If this bug does not occur with Redhat Linux 6.0, then I am afraid it will never be fixed. Mozilla support is for 6.0 and above. But let's see what claudius finds. No worries.

This is a duplicate of an existing bug. *** This bug has been marked as a duplicate of 15946 ***

VERIFIED dupe