Fix record-trace output

Author: mdh1418

src/tests/tracing/eventpipe/userevents/userevents.cs

@@ -34,7 +34,6 @@ public static int TestEntryPoint()
             string appBaseDir = AppContext.BaseDirectory;
             string recordTracePath = Path.Combine(appBaseDir, "record-trace");
             string scriptFilePath = Path.Combine(appBaseDir, "dotnet-common.script");
-            string traceFilePath = Path.GetTempFileName();
             const string userEventsDataPath = "/sys/kernel/tracing/user_events_data";
 
             if (!File.Exists(recordTracePath))
@@ -48,6 +47,10 @@ public static int TestEntryPoint()
                 return -1;
             }
 
+            string traceFilePath = Path.GetTempFileName();
+            File.Delete(traceFilePath); // record-trace requires the output file to not exist
+            traceFilePath = Path.ChangeExtension(traceFilePath, ".nettrace");
+
             ProcessStartInfo recordTraceStartInfo = new();
             recordTraceStartInfo.FileName = "sudo";
             recordTraceStartInfo.Arguments = $"-n {recordTracePath} --script-file {scriptFilePath} --out {traceFilePath}";