Possible memory leak in ScriptEngine.AddCOMType (V8ScriptEngine) #510
Description
Version: Microsoft.ClearScript.V8 7.3.7
Framework: .Net Framework 4.8
I haven't found a way to unload a COM. If it does not exist manually, I believe there is a leak problem.
I made a little example code to show:
for (var i = 0; i <= 100; i++)
{
using (var engine = new V8ScriptEngine(flags))
{
engine.AddCOMType("XMLHttpRequest", "MSXML2.XMLHTTP");
engine.AddHostType("Console", typeof(Console));
Console.WriteLine("executing script");
engine.Execute($@"
Console.WriteLine(""Sample Http Request with XMLHTTP"");
function get(url) {{
var xhr = new XMLHttpRequest();
xhr.open('GET', url, false);
xhr.send();
if (xhr.status == 200)
return xhr.responseText;
throw new Error('Request failed: ' + xhr.status);
}}
Console.WriteLine(get(""https://viacep.com.br/ws/01001000/json/""));
delete xhr;
");
// Attempt to release the com
engine.CollectGarbage(true);
engine.Dispose();
GC.Collect();
GC.WaitForPendingFinalizers();
}With the program running it is possible to monitor and see the objects being added, causing the memory problem.
I was using MSXML2.XMLHTTP, to have a single script to test in the browser or in my application. That's how I came across the problem.