PollSelectorImpl's FD leak for asyncServlet ------------------------------------------- Key: WFLY-5731 URL: https://issues.jboss.org/browse/WFLY-5731 Project: WildFly Issue Type: Bug Components: Web (Undertow) Affects Versions: 8.1.0.Final Environment: OS:Red Hat Enterprise Linux Server release 5.5 (Tikanga) MW:wildfly-8.1.0.Final JDK: java version "1.7.0_25" Java(TM) SE Runtime Environment (build 1.7.0_25-b15) Java HotSpot(TM) 64-Bit Server VM (build 23.25-b01, mixed mode) Reporter: 浩 陈 Assignee: Stuart Douglas Priority: Critical Fix For: 10.0.0.CR5 Attachments: DemoServlet.java AsyncServlet doGet() like this: protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("text/html;charset=UTF-8"); AsyncContext ctx = req.startAsync(); new Thread(new Executor(ctx)).start(); } public class Executor implements Runnable { private AsyncContext ctx = null; public Executor(AsyncContext ctx) { this.ctx = ctx; } public void run() { try { char[] data = new char[1024 * 1024 * 1]; PrintWriter out = ctx.getResponse().getWriter(); out.write(data); out.flush(); ctx.complete(); } catch (Exception e) { e.printStackTrace(); } } do request this Servlet some times , run linux cmd : lsof -p [JAVAPID]|grep pipe|wc -l this number increases by two every one request,but never decrease! when this number up to OS's open file limit everything is not OK.