--- a/hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.debug/src/org/graalvm/compiler/debug/internal/DebugScope.java	Fri May 12 13:14:25 2017 -0700
+++ b/hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.debug/src/org/graalvm/compiler/debug/internal/DebugScope.java	Fri May 12 13:56:13 2017 -0700
@@ -235,7 +235,7 @@
     }
 
     public boolean isDumpEnabled(int dumpLevel) {
-        assert dumpLevel > 0;
+        assert dumpLevel >= 0;
         return currentDumpLevel >= dumpLevel;
     }
 
@@ -441,7 +441,7 @@
             memUseTrackingEnabled = false;
             timeEnabled = false;
             verifyEnabled = false;
-            currentDumpLevel = 0;
+            currentDumpLevel = -1;
             methodMetricsEnabled = false;
             // Be pragmatic: provide a default log stream to prevent a crash if the stream is not
             // set while logging