Comment 2 for bug 1377110

StacktraceTop:
 g_mutex_clear (mutex=mutex@entry=0xf8d8f0) at /build/buildd/glib2.0-2.41.5/./glib/gthread-posix.c:1301
 g_vfs_backend_mtp_finalize (object=0xf8d8c0) at gvfsbackendmtp.c:378
 g_object_unref (_object=0xf8d8c0) at /build/buildd/glib2.0-2.41.5/./gobject/gobject.c:3170
 g_value_unset (value=value@entry=0x7fff2eb7d510) at /build/buildd/glib2.0-2.41.5/./gobject/gvalue.c:272
 g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, var_args=var_args@entry=0x7fff2eb7d690) at /build/buildd/glib2.0-2.41.5/./gobject/gsignal.c:3339