Comment 4 for bug 1242367

(gdb) bt
#0 syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1 0x00007f8af81be7e5 in v4l2_ioctl ()
   from /usr/lib/x86_64-linux-gnu/libv4l2.so.0
#2 0x00007f8b0038d04c in ?? ()
   from /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvideo4linux2.so
#3 0x00007f8b0037ec40 in ?? ()
   from /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvideo4linux2.so
#4 0x00007f8b00387f8d in ?? ()
   from /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstvideo4linux2.so
#5 0x00007f8b13df31a2 in gst_element_change_state ()
   from /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#6 0x00007f8b13df387c in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#7 0x00007f8b13dd95d9 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#8 0x00007f8b13df31a2 in gst_element_change_state ()
   from /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#9 0x00007f8b13df387c in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgstreamer-1.0.so.0
#10 0x00007f8b157192bd in ?? () from /usr/lib/x86_64-linux-gnu/libcheese.so.7
#11 0x00007f8b3818411a in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#12 0x00007f8b38186294 in g_object_new_valist ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#13 0x00007f8b388846d9 in g_initable_new_valist ()
   from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#14 0x00007f8b388847cc in g_initable_new ()
   from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#15 0x00007f8b15719aa4 in cheese_camera_device_new ()
   from /usr/lib/x86_64-linux-gnu/libcheese.so.7
#16 0x00007f8b1571a534 in cheese_camera_device_monitor_set_up_device ()
   from /usr/lib/x86_64-linux-gnu/libcheese.so.7
#17 0x00007f8b1571a62c in ?? () from /usr/lib/x86_64-linux-gnu/libcheese.so.7
#18 0x00007f8b1571a6ef in ?? () from /usr/lib/x86_64-linux-gnu/libcheese.so.7
#19 0x00007f8b37eb2ed8 in g_list_foreach ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007f8b1571a77e in cheese_camera_device_monitor_coldplug ()
   from /usr/lib/x86_64-linux-gnu/libcheese.so.7
#21 0x00007f8b1625523b in ?? ()
   from /usr/lib/x86_64-linux-gnu/control-center-1/panels/libuser-accounts.so
#22 0x00007f8b1625fbe2 in ?? ()
   from /usr/lib/x86_64-linux-gnu/control-center-1/panels/libuser-accounts.so
#23 0x00007f8b3819fc3b in g_type_create_instance ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#24 0x00007f8b381840e5 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#25 0x00007f8b38186294 in g_object_new_valist ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#26 0x00007f8b38186674 in g_object_new ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#27 0x0000000000409e38 in ?? ()
#28 0x00000000004074ea in _start ()