I have a Logitech QuickCam Express webcam and if you create a v4l2src and then probe for devices it seems to cause memory corruption. I don't know if this could be a GStreamer bug or if it would be the driver. I'm on Ubuntu 8.10 (Intrepid). Doing the following sequence causes a crash.

Steps to cause the crash:
1. Have Logitech QuickCam Express connected.
2. Create a v4l2src.
3. Probe the v4l2src's devices.
4. Create 2 more v4l2srcs.
5. Free all of them.

The program used to cause the crash:
#include <gst/gst.h>
#include <gst/interfaces/propertyprobe.h>

int main(int argc, char *argv[])
{
	gst_init(&argc, &argv);
g_message("creating element");
	GstElement *element1 = gst_element_factory_make("v4l2src", NULL);
g_message("created element1 %p", element1);

g_message("probing devices");
	gst_property_probe_probe_property_name(GST_PROPERTY_PROBE(element1), "device");

g_message("creating more elements");
	GstElement *element2 = gst_element_factory_make("v4l2src", NULL);
g_message("created element2 %p", element2);
	GstElement *element3 = gst_element_factory_make("v4l2src", NULL);
g_message("created element3 %p", element3);

g_message("freeing element3");
	gst_object_unref(element3);
g_message("freeing element2");
	gst_object_unref(element2);
g_message("freeing element1");
	gst_object_unref(element1);
g_message("return");
	return 0;
}