Index: /trunk/src/VBox/Additions/common/VBoxGuest/VBoxGuest-darwin.cpp
===================================================================
--- /trunk/src/VBox/Additions/common/VBoxGuest/VBoxGuest-darwin.cpp	(revision 50698)
+++ /trunk/src/VBox/Additions/common/VBoxGuest/VBoxGuest-darwin.cpp	(revision 50699)
@@ -70,4 +70,17 @@
 
 
+/** PINFO() - always does printf(). */
+#define PINFO(fmt, args...) \
+    printf(fmt "\n", ## args)
+
+/** PDEBUG() - does printf() with extra debug data on DEBUG build and keep silence on a release one. */
+#if DEBUG
+# define MODULE_NAME "VBoxGuest"
+# define PDEBUG(fmt, args...) \
+     printf(MODULE_NAME ": DEBUG: %s:%d %s(): " fmt "\n", __FILE__, __LINE__, __FUNCTION__, ## args)
+#else
+# define PDEBUG(fmt, args...) { ; }
+#endif
+
 
 /*******************************************************************************
@@ -217,8 +230,4 @@
 static kern_return_t    VbgdDarwinStart(struct kmod_info *pKModInfo, void *pvData)
 {
-#ifdef DEBUG
-    printf("VbgdDarwinStart\n");
-#endif
-
     /*
      * Initialize IPRT.
@@ -227,7 +236,9 @@
     if (RT_FAILURE(rc))
     {
-        printf("VBoxGuest: RTR0Init failed with rc=%d\n", rc);
+        PDEBUG("VBoxGuest: RTR0Init failed with rc=%d\n", rc);
         return KMOD_RETURN_FAILURE;
     }
+
+    PDEBUG("VBoxGuest: driver loaded\n");
 
     return KMOD_RETURN_SUCCESS;
@@ -280,7 +291,7 @@
 {
     RTR0TermForced();
-#ifdef DEBUG
-    printf("VbgdDarwinStop - done\n");
-#endif
+
+    PDEBUG("VBoxGuest: driver unloaded\n");
+
     return KMOD_RETURN_SUCCESS;
 }
@@ -671,5 +682,5 @@
     bool fTaken = VBoxGuestCommonISR(&g_DevExt);
     if (!fTaken) /** @todo r=bird: This looks bogus as we might actually be sharing interrupts with someone. */
-        printf("VBoxGuestCommonISR error\n");
+        PDEBUG("VBoxGuestCommonISR error\n");
 
     return fTaken;
@@ -799,5 +810,5 @@
                                 /* register the service. */
                                 registerService();
-                                LogRel(("VBoxGuest: Successfully started I/O kit class instance.\n"));
+                                LogRel(("VBoxGuest: IOService started\n"));
                                 return true;
                             }
@@ -844,5 +855,7 @@
 void org_virtualbox_VBoxGuest::stop(IOService *pProvider)
 {
-    LogFlow(("org_virtualbox_VBoxGuest::stop([%p], %p)\n", this, pProvider));
+    /* Do not use Log*() here (in IOService instance) because its instance
+     * already terminated in BSD's module unload callback! */
+    PDEBUG("org_virtualbox_VBoxGuest::stop([%p], %p)\n", this, pProvider);
 
     AssertReturnVoid(ASMAtomicReadBool(&g_fInstantiated));
@@ -850,5 +863,5 @@
     /* Low level termination should be performed only once */
     if (!disableVmmDevInterrupts())
-        LogRel(("vboxguest: unable to unregister interrupt handler\n"));
+        PDEBUG("VBoxGuest: unable to unregister interrupt handler\n");
 
     VbgdDarwinCharDevRemove();
@@ -865,5 +878,5 @@
     ASMAtomicWriteBool(&g_fInstantiated, false);
 
-    LogRel(("vboxguest module unloaded\n"));
+    PINFO("VBoxGuest: IOService stopped\n");
 }
 
@@ -877,7 +890,10 @@
 bool org_virtualbox_VBoxGuest::terminate(IOOptionBits fOptions)
 {
+    /* Do not use Log*() here (in IOService instance) because its instance
+     * already terminated in BSD's module unload callback! */
+
     bool fRc;
-    LogFlow(("org_virtualbox_VBoxGuest::terminate: reference_count=%d g_cSessions=%d (fOptions=%#x)\n",
-             KMOD_INFO_NAME.reference_count, ASMAtomicUoReadS32(&g_cSessions), fOptions));
+    PDEBUG("org_virtualbox_VBoxGuest::terminate: reference_count=%d g_cSessions=%d (fOptions=%#x)\n",
+             KMOD_INFO_NAME.reference_count, ASMAtomicUoReadS32(&g_cSessions), fOptions);
     if (    KMOD_INFO_NAME.reference_count != 0
         ||  ASMAtomicUoReadS32(&g_cSessions))
@@ -885,5 +901,5 @@
     else
         fRc = IOService::terminate(fOptions);
-    LogFlow(("org_virtualbox_SupDrv::terminate: returns %d\n", fRc));
+    PDEBUG("org_virtualbox_SupDrv::terminate: returns %d\n", fRc);
     return fRc;
 }