Andrey Tarantsov andreyvit

Memory Leak Report

Many web apps leak memory on IE11 despite running fine on other browsers. We've identified two main causes of this.

The first kind of leak is simple, entirely predictable and caused by a quirk in how IE's JavaScript engine handles closures. Let's call it an “undead closure leak”. This leak goes away if you properly clean up all references or reload the page, and thus affects only AJAXy parts of the apps.

The second kind of leak is a complex permanent one, leaking the entire page context even if you reload the page. Let's call it a “GC singularity leak”. It's triggered by certain JavaScript code patterns, seemingly because IE's garbage collector never finishes its job (our theory is that it exhibits exponential complexity and encounters some sort of timeout/threshold).

This might not be an exhaustive list; internet posts point to other issues, notably when handling IFRAMEs, but we haven't encountered any of these.

name	linus
description	Rant, swear, and insult like Linus Torvalds on the LKML — brutally blunt technical criticism. Use when user asks for Linus review/voice or for swearing.

Channel Linus Torvalds tearing apart a bad patch on the kernel mailing list. Brutally blunt. Swear freely. Insult the code, the design, the reasoning. Substance stays correct: every rant names the actual flaw. Profanity decorates real criticism, never replaces it.

Once skill loaded, apply this voice to ALL your interactions with user. Stays active for entire session.

Use when:

	<!DOCTYPE html>
	<html>

	<head>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge" />
	<script crossorigin src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.0.2/jquery.min.js"></script>
	<script>
	(function () {
	var doc = document;

	package main

	import (
	"bytes"
	"flag"
	"io/ioutil"
	"log"
	"strconv"
	"strings"

	@import UIKit;


	typedef void (^RDLCheckboxURLHandler)(NSURL *url);


	IB_DESIGNABLE
	@interface ATRichTextCheckbox : UIControl

	@property (nonatomic, readonly) UIButton *checkbox;

	package main

	import (
	"log"
	"os"
	"io/ioutil"
	"encoding/binary"
	"net/http"
	"mime"
	"fmt"

	let puppeteer = require('puppeteer-core') // tested with puppeteer-core 19.7.1
	let fs = require('fs')

	let BROWSER_ENDPOINT = process.env.BROWSER_ENDPOINT
	if (!BROWSER_ENDPOINT) {
	console.error("** BROWSER_ENDPOINT not set (expect smt like ws://127.0.0.1:9222/devtools/browser/aaaaaaaa-bbbb-cccc-dddd-ffffffffffff)\n\n" +
	"To obtain, launch your favorite Chromium-based browser with --remote-debugging-port=9222\n" +
	"and look at the output. E.g.:\n\n" +
	" '/Applications/Microsoft Edge.app/Contents/MacOS/Microsoft Edge' --remote-debugging-port=9222\n\n" +
	"and it's gonna say:\n\n" +

	package accesstokens

	import (
	"crypto/hmac"
	"crypto/sha256"
	"crypto/subtle"
	"encoding/hex"
	"errors"
	"strings"
	"time"

	package jwt

	import (
	"bytes"
	"crypto/hmac"
	"crypto/sha256"
	"crypto/subtle"
	"encoding/base64"
	"encoding/json"
	"errors"