Index: /trunk/src/VBox/ValidationKit/tests/additions/tdAddGuestCtrl.py
===================================================================
--- /trunk/src/VBox/ValidationKit/tests/additions/tdAddGuestCtrl.py	(revision 84600)
+++ /trunk/src/VBox/ValidationKit/tests/additions/tdAddGuestCtrl.py	(revision 84601)
@@ -2143,5 +2143,5 @@
                                                    oTest.aEnv, oTest.afFlags, oTest.timeoutMS);
         except:
-            reporter.maybeErrXcpt(fIsError, 'asArgs=%s' % (oTest.asArgs,));
+            reporter.maybeErrXcpt(fIsError, 'type=%s, asArgs=%s' % (type(oTest.asArgs), oTest.asArgs,));
             return False;
         if oProcess is None:
@@ -2963,9 +2963,9 @@
                     sCmd   = sShell;
                     asArgs = [ sShell, sShellOpt, "echo",
-                               self.oTestFiles.generateFilenameEx(128 * 1024, 2048), "--end-marker" ],
+                               str(self.oTestFiles.generateFilenameEx(128 * 1024, 2048)), "--end-marker" ],
                 else:
                     sCmd   = oTestVm.pathJoin(self.oTstDrv.getGuestSystemDir(oTestVm), 'echo');
                     asArgs = [ sCmd,
-                               self.oTestFiles.generateFilenameEx(128 * 1024, 2048), "--end-marker" ],
+                               str(self.oTestFiles.generateFilenameEx(128 * 1024, 2048)), "--end-marker" ],
                 ## @todo Check limits; on Ubuntu with 256KB IPRT returns VERR_NOT_IMPLEMENTED.
                 atExec.append([ tdTestExec(sCmd, asArgs,