Index: /trunk/src/VBox/VMM/VMMAll/IOMAllMMIO.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMAll/IOMAllMMIO.cpp	(revision 55971)
+++ /trunk/src/VBox/VMM/VMMAll/IOMAllMMIO.cpp	(revision 55972)
@@ -1843,5 +1843,5 @@
     else
         rcStrict = iomMMIODoWrite(pVM, pVCpu, pRange, GCPhysFault, pvBuf, (unsigned)cbBuf);
-    AssertRC(rcStrict);
+    AssertMsgRC(rcStrict, ("%Rrc\n", VBOXSTRICTRC_VAL(rcStrict)));
 
     iomMmioReleaseRange(pVM, pRange);