') + ')', 'gi'); if (regex.test(text)) { found = true; var frag = document.createDocumentFragment(); var parts = text.split(regex); parts.forEach(function(part, i) { if (i % 2 === 0) { frag.appendChild(document.createTextNode(part)); } else { var span = document.createElement('span'); span.className = 'userscript-highlight'; span.textContent = part; frag.appendChild(span); } }); node.parentNode.replaceChild(frag, node); } }); } else if (node.nodeType === 1 && node.childNodes) { // element var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT']; if (!skipTags.includes(node.tagName)) { Array.from(node.childNodes).forEach(highlight); } } } highlight(document.body); // Re-highlight on dynamic content var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1 || node.nodeType === 3) highlight(node); }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ', 'i'); if (__m === '*' || __re.test(location.href)) { // Strip utm_, fbclid, gclid, etc. from all links on page (function() { var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid', 'ref', 'ref_src', 'source', 'medium', 'campaign']; function cleanUrl(url) { try { var u = new URL(url, window.location.origin); var changed = false; trackingParams.forEach(function(p) { if (u.searchParams.has(p)) { u.searchParams.delete(p); changed = true; } }); return changed ? u.toString() : url; } catch (e) { return url; } } function cleanLinks() { document.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } cleanLinks(); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1) { if (node.tagName === 'A') cleanLinks(); node.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + ', 'i'); if (__m === '*' || __re.test(location.href)) { // Auto-enable theater mode on YouTube (function() { function tryTheater() { var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]'); if (btn && !btn.classList.contains('activated')) { btn.click(); } } // Try immediately tryTheater(); // Try after navigation (SPA) var lastUrl = location.href; setInterval(function() { if (location.href !== lastUrl) { lastUrl = location.href; setTimeout(tryTheater, 500); } }, 1000); // Also try on player load var observer = new MutationObserver(tryTheater); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ', 'i'); if (__m === '*' || __re.test(location.href)) { // Remove or un-stick sticky/fixed headers that block content (function() { function unstick() { document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) { if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') { el.style.position = 'static'; el.style.top = 'auto'; el.style.zIndex = 'auto'; } }); } unstick(); var observer = new MutationObserver(unstick); observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] }); })(); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); })(); Wasm / R2R: crossgen2 hangs (super-linear) on b28158.il (16700+ catch handlers) · Issue #129264 · dotnet/runtime · GitHub
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Wasm / R2R: crossgen2 hangs (super-linear) on b28158.il (16700+ catch handlers) #129264

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#129306
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Wasm / R2R: crossgen2 hangs (super-linear) on b28158.il (16700+ catch handlers)#129264
#129306
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AndyAyersMS
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arch-wasmWebAssembly architecturearea-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI
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Future

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@AndyAyersMS
AndyAyersMS
opened on Jun 10, 2026

Compiling src\tests\JIT\Regression\VS-ia64-JIT\V1.2-M02\b28158\b28158.il
for Wasm R2R never completes — crossgen2 runs at 100% CPU indefinitely
(killed by hand after >30 min).

This file is a single Main() method with one outer .try and
~16,700 catch handlers (file is 2.9 MB, 133,891 lines). The wasm
JIT / control-flow lowering presumably has super-linear cost in the
number of EH regions; on x64 R2R the same file compiles in seconds.

This blocks the merged R2R image build for Regression_4 (whose glob
VS-ia64-JIT/**/*.??proj picks it up), and similarly any other
partition that includes the file. Because crossgen2 never finishes
there is no failure message — the build just hangs. The runtime-side
DOTNET_ReadyToRunExcludeList workaround used in #128234 does not help
(R2R compile time, not runtime).

Repro

.\build clr+libs -rc debug -c release -os browser
.\src\tests\build skipmanaged browser
;; put repo dotnet in path
set DOTNET_ROOT=<REPO_ROOT>\.dotnet
set PATH=<REPO_ROOT>\.dotnet;%PATH%
cd src\tests\JIT\Regression\VS-ia64-JIT\V1.2-M02\b28158
dotnet msbuild /p:TargetArchitecture=wasm /p:TargetOS=browser /p:RuntimeFlavor=coreclr ^
/p:BuildAsStandalone=true b28158.ilproj
set CORE_ROOT=<REPO_ROOT>\artifacts\tests\coreclr\browser.wasm.Debug\Tests\Core_Root
set DLL=<REPO_ROOT>\artifacts\tests\coreclr\browser.wasm.Debug\JIT\Regression\VS-ia64-JIT\V1.2-M02\b28158\b28158\b28158.dll
set CG2DIR=<REPO_ROOT>\artifacts\bin\crossgen2_inbuild\wasm\Debug
dotnet %CG2DIR%\crossgen2.dll ^
--targetos:windows --targetarch:wasm ^
--jitpath %CG2DIR%\clrjit_universal_wasm_x64.dll ^
--inputbubble ^
-r:%CORE_ROOT%\*.dll ^
-o:b28158.wasm ^
--parallelism 1 ^
%DLL%
;; crossgen2 hangs at 100% CPU; kill after a few minutes.

Hit on wasm-eh-infra (and on any branch built on top of it, e.g. PR #129197).

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