Index: /trunk/src/VBox/Devices/Storage/DrvSCSI.cpp
===================================================================
--- /trunk/src/VBox/Devices/Storage/DrvSCSI.cpp	(revision 24104)
+++ /trunk/src/VBox/Devices/Storage/DrvSCSI.cpp	(revision 24105)
@@ -891,4 +891,7 @@
     if (pThis->pQueueRequests)
     {
+        if (!drvscsiAsyncIOLoopNoPendingDummy(pThis, 100 /*ms*/))
+            LogRel(("drvscsiDestruct#%u: previous dummy request is still pending\n", pDrvIns->iInstance));
+
         rc = RTReqDestroyQueue(pThis->pQueueRequests);
         AssertMsgRC(rc, ("Failed to destroy queue rc=%Rrc\n", rc));