Index: /trunk/src/VBox/ValidationKit/utils/fs/FsPerf.cpp
===================================================================
--- /trunk/src/VBox/ValidationKit/utils/fs/FsPerf.cpp	(revision 76974)
+++ /trunk/src/VBox/ValidationKit/utils/fs/FsPerf.cpp	(revision 76975)
@@ -1241,4 +1241,8 @@
     RTTESTI_CHECK_RC(RTFileDelete(InEmptyDir(RT_STR_TUPLE(".."))), VERR_ACCESS_DENIED);
     RTTESTI_CHECK_RC(RTFileDelete(InEmptyDir(RT_STR_TUPLE(""))),   VERR_ACCESS_DENIED);
+#elif defined(RT_OS_DARWIN) /* unlink() on xnu 16.7.0 is behaviour totally werid: */
+    RTTESTI_CHECK_RC(RTFileDelete(InEmptyDir(RT_STR_TUPLE("."))),  VERR_INVALID_PARAMETER);
+    RTTESTI_CHECK_RC(RTFileDelete(InEmptyDir(RT_STR_TUPLE(".."))), VINF_SUCCESS /*WTF?!?*/);
+    RTTESTI_CHECK_RC(RTFileDelete(InEmptyDir(RT_STR_TUPLE(""))),   VERR_ACCESS_DENIED);
 #else
     RTTESTI_CHECK_RC(RTFileDelete(InEmptyDir(RT_STR_TUPLE("."))),  VERR_IS_A_DIRECTORY);
@@ -2005,5 +2009,5 @@
         {
             uint32_t const cbLeft    = (uint32_t)(cbBuf - offBuf);
-            uint32_t const cbToWrite = aRuns[i].cbMax < UINT32_MAX / 2 ? RTRandU32Ex(1, aRuns[i].cbMax)
+            uint32_t const cbToWrite = aRuns[i].cbMax < UINT32_MAX / 2 ? RTRandU32Ex(1, RT_MIN(aRuns[i].cbMax, cbLeft))
                                      : aRuns[i].cbMax == UINT32_MAX    ? RTRandU32Ex(RT_MAX(cbLeft / 4, 1), cbLeft)
                                      : RTRandU32Ex(cbLeft >= _8K ? _8K : 1, RT_MIN(_1M, cbLeft));
@@ -2014,5 +2018,6 @@
             else
             {
-                RTTestIFailed("Attempting to write %#x bytes at %#zx, only got %#x written!\n", cbToWrite, offBuf, cbActual);
+                RTTestIFailed("Attempting to write %#x bytes at %#zx (%#x left), only got %#x written!\n",
+                              cbToWrite, offBuf, cbLeft, cbActual);
                 if (cbActual)
                     offBuf += cbActual;