https://blog.ast.moe/en/tags/asan/Recent posts: GorimuchuHugohttps://blog.ast.moe/en/blog/2026-09-10-3/Thu, 10 Sep 2026 20:14:12 +0900https://blog.ast.moe/en/blog/2026-09-10-3/<p>In the previous article, we fixed the issue where Boa’s parser exhausted a 2 MiB stack. (<a href="https://blog.ast.moe/en/blog/2026-09-10-2/">related article</a>)</p> <p>We reduced the frame size during recursion and made it return an error for inputs that are too deep. With a normal build, the original Test262 now also passes within the 2 MiB limit.</p> <p>When we continued diagnosing with AddressSanitizer (ASAN) in that state, it started rejecting even shallow inputs.</p> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-text" data-lang="text"><span style="display:flex;"><span>parser recursion limit exceeded </span></span></code></pre></div><p>The protection we added to prevent stack exhaustion was stopping prematurely, even though the stack hadn’t been fully used. This concerns <a href="https://github.com/ieee0824/omoikane/issues/640">Issue #640</a>.</p>