Comment 2 for bug 1231358

StacktraceTop:
 _gdk_pixbuf_new_from_uri_at_scale (uri=uri@entry=0x301c0d0 "file:///usr/share/backgrounds/edubuntu_default.png", width=width@entry=256, height=height@entry=256, preserve_aspect_ratio=1) at gnome-desktop-thumbnail.c:469
 gnome_desktop_thumbnail_factory_generate_thumbnail (factory=<optimized out>, uri=0x301c0d0 "file:///usr/share/backgrounds/edubuntu_default.png", mime_type=<optimized out>) at gnome-desktop-thumbnail.c:1223
 thumbnail_thread_start (data=<optimized out>) at nautilus-thumbnails.c:546
 start_thread (arg=0x7f7135409700) at pthread_create.c:311
 __GI___sysctl (name=0x7f7135409700, nlen=1, oldval=0x7f7118001450, oldlenp=0x0, newval=0x0, newlen=140124266169076) at ../sysdeps/unix/sysv/linux/sysctl.c:32