Index: /trunk/src/VBox/Main/HostImpl.cpp
===================================================================
--- /trunk/src/VBox/Main/HostImpl.cpp	(revision 31388)
+++ /trunk/src/VBox/Main/HostImpl.cpp	(revision 31389)
@@ -1513,5 +1513,6 @@
     if (FAILED(autoCaller.rc())) return autoCaller.rc();
 
-    AutoReadLock alock(&m->usbListsLock COMMA_LOCKVAL_SRC_POS);
+    AutoReadLock alock1(this COMMA_LOCKVAL_SRC_POS);
+    AutoReadLock alock2(&m->usbListsLock COMMA_LOCKVAL_SRC_POS);
 
     data.llUSBDeviceFilters.clear();