Fix incorrect array dereference. (#17113)

diff --git a/src/mscorlib/shared/System/Diagnostics/Tracing/EventSource.cs b/src/mscorlib/shared/System/Diagnostics/Tracing/EventSource.cs
index 21e03e0..1836a1f 100644 (file)
--- a/src/mscorlib/shared/System/Diagnostics/Tracing/EventSource.cs
+++ b/src/mscorlib/shared/System/Diagnostics/Tracing/EventSource.cs
@@ -901,7 +901,7 @@ namespace System.Diagnostics.Tracing
                     EventSource.EventData* descrs = stackalloc EventSource.EventData[2];
                     descrs[0].DataPointer = (IntPtr)string1Bytes;
                     descrs[0].Size = ((arg1.Length + 1) * 2);
-                    descrs[1].Reserved = 0;
+                    descrs[0].Reserved = 0;
                     descrs[1].DataPointer = (IntPtr)(&arg2);
                     descrs[1].Size = 8;
                     descrs[1].Reserved = 0;