FailFast: (InternalError): Runtime internal error · Issue #2254 · dotnet/corert

JIT\Directed\FaultHandlers\Nesting\Nesting test is hitting an issue with calling finally funclets:

 reproNative.exe!System_Private_CoreLib_Interop_mincore__RaiseFailFastException() Line 166	Unknown
reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__FailFast_1() Line 232	Unknown
reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__RuntimeFailFast() Line 188	Unknown
reproNative.exe!System_Private_CoreLib_System_Runtime_EH__FailFastViaClasslib() Line 177	Unknown
reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowHwEx() Line 530	Unknown
reproNative.exe!RhpThrowHwEx() Line 106	Unknown
> reproNative.exe!nesting_TEST__Main() Line 64	Unknown
reproNative.exe!RhpCallFinallyFunclet() Line 597	Unknown
reproNative.exe!System_Private_CoreLib_System_Runtime_EH__InvokeSecondPass_0() Line 890	Unknown
reproNative.exe!System_Private_CoreLib_System_Runtime_EH__DispatchEx() Line 674	Unknown
reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowEx() Line 560	Unknown
reproNative.exe!RhpThrowEx() Line 198	Unknown
reproNative.exe!nesting_TEST__Main() Line 50	Unknown
reproNative.exe!__managed__Main�()	Unknown

The disassembly at the TEST__Main frame looks like this:

00007FF7CB5155B5 ?? ?? ?? 00007FF7CB5155B6 ?? ?? ?? 00007FF7CB5155B7 ?? ?? ?? 00007FF7CB5155B8 ?? ?? ?? leave end_6
end_6:
call void [mscorlib]System.GC::Collect() 00007FF7CB5155B9 BA 02 00 00 00 mov edx,2 00007FF7CB5155BE E8 69 A0 FF FF call System_Private_CoreLib_System_Runtime_InternalCalls__RhCollect (07FF7CB50F62Ch) endfinally

We ended up calling 4 bytes before what we were supposed to call. The hardware exception being thrown is 0xC000001D: Illegal Instruction.

blocks (function() { function addCopyButtons() { document.querySelectorAll('pre code').forEach(function(codeBlock) { if (codeBlock.parentElement.hasAttribute('data-copy-added')) return; codeBlock.parentElement.setAttribute('data-copy-added', 'true'); var btn = document.createElement('button'); btn.textContent = 'Copy'; btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;'; btn.onmouseover = function() { this.style.opacity = '1'; }; btn.onmouseout = function() { this.style.opacity = '0.7'; }; btn.onclick = function() { navigator.clipboard.writeText(codeBlock.textContent).then(function() { btn.textContent = 'Copied!'; setTimeout(function() { btn.textContent = 'Copy'; }, 1500); }); }; codeBlock.parentElement.style.position = 'relative'; codeBlock.parentElement.appendChild(btn); }); } addCopyButtons(); // Re-run on dynamic content var observer = new MutationObserver(addCopyButtons); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); } })(); (function(){ try { var __m = "github.com"; var __re = new RegExp('^' + "github\\.com" + ' FailFast: (InternalError): Runtime internal error · Issue #2254 · dotnet/corert · GitHub Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert Uh oh! There was an error while loading. Please reload this page. This repository was archived by the owner on Nov 1, 2020. It is now read-only. dotnet /corertPublic archive Notifications You must be signed in to change notification settings Fork 499 Star 2.9k Code Issues313 Pull requests0 Projects Wiki Security and quality0 Insights Additional navigation options Code Issues Pull requests Projects Wiki Security and quality Insights This repository was archived by the owner on Nov 1, 2020. It is now read-only. FailFast: (InternalError): Runtime internal error #2254 Copy link Copy link Closed #2271 Closed FailFast: (InternalError): Runtime internal error#2254 #2271 Copy link Assignees Labels Runtime Milestone Preview Description MichalStrehovsky opened on Nov 23, 2016 Issue body actions JIT\Directed\FaultHandlers\Nesting\Nesting test is hitting an issue with calling finally funclets: reproNative.exe!System_Private_CoreLib_Interop_mincore__RaiseFailFastException() Line 166 Unknown reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__FailFast_1() Line 232 Unknown reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__RuntimeFailFast() Line 188 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__FailFastViaClasslib() Line 177 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowHwEx() Line 530 Unknown reproNative.exe!RhpThrowHwEx() Line 106 Unknown > reproNative.exe!nesting_TEST__Main() Line 64 Unknown reproNative.exe!RhpCallFinallyFunclet() Line 597 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__InvokeSecondPass_0() Line 890 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__DispatchEx() Line 674 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowEx() Line 560 Unknown reproNative.exe!RhpThrowEx() Line 198 Unknown reproNative.exe!nesting_TEST__Main() Line 50 Unknown reproNative.exe!__managed__Main�() Unknown The disassembly at the TEST__Main frame looks like this: 00007FF7CB5155B5 ?? ?? ?? 00007FF7CB5155B6 ?? ?? ?? 00007FF7CB5155B7 ?? ?? ?? 00007FF7CB5155B8 ?? ?? ?? leave end_6 end_6: call void [mscorlib]System.GC::Collect() 00007FF7CB5155B9 BA 02 00 00 00 mov edx,2 00007FF7CB5155BE E8 69 A0 FF FF call System_Private_CoreLib_System_Runtime_InternalCalls__RhCollect (07FF7CB50F62Ch) endfinally We ended up calling 4 bytes before what we were supposed to call. The hardware exception being thrown is 0xC000001D: Illegal Instruction. Reactions are currently unavailable Metadata Metadata Assignees jkotas Labels Runtime Type No type Projects No projects Milestone PreviewNo due date Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { // Force GitHub README to respect dark mode (function() { var style = document.createElement('style'); style.textContent = ' .markdown-body { color-scheme: dark light; } .markdown-body pre { background: #161b22 !important; } .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; } .markdown-body table th, .markdown-body table td { border-color: #30363d !important; } .markdown-body img { background: #0d1117; } .markdown-body blockquote { border-left-color: #8b949e; } .markdown-body hr { border-color: #30363d; } '; document.head.appendChild(style); })(); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' FailFast: (InternalError): Runtime internal error · Issue #2254 · dotnet/corert · GitHub Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert Uh oh! There was an error while loading. Please reload this page. This repository was archived by the owner on Nov 1, 2020. It is now read-only. dotnet /corertPublic archive Notifications You must be signed in to change notification settings Fork 499 Star 2.9k Code Issues313 Pull requests0 Projects Wiki Security and quality0 Insights Additional navigation options Code Issues Pull requests Projects Wiki Security and quality Insights This repository was archived by the owner on Nov 1, 2020. It is now read-only. FailFast: (InternalError): Runtime internal error #2254 Copy link Copy link Closed #2271 Closed FailFast: (InternalError): Runtime internal error#2254 #2271 Copy link Assignees Labels Runtime Milestone Preview Description MichalStrehovsky opened on Nov 23, 2016 Issue body actions JIT\Directed\FaultHandlers\Nesting\Nesting test is hitting an issue with calling finally funclets: reproNative.exe!System_Private_CoreLib_Interop_mincore__RaiseFailFastException() Line 166 Unknown reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__FailFast_1() Line 232 Unknown reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__RuntimeFailFast() Line 188 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__FailFastViaClasslib() Line 177 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowHwEx() Line 530 Unknown reproNative.exe!RhpThrowHwEx() Line 106 Unknown > reproNative.exe!nesting_TEST__Main() Line 64 Unknown reproNative.exe!RhpCallFinallyFunclet() Line 597 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__InvokeSecondPass_0() Line 890 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__DispatchEx() Line 674 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowEx() Line 560 Unknown reproNative.exe!RhpThrowEx() Line 198 Unknown reproNative.exe!nesting_TEST__Main() Line 50 Unknown reproNative.exe!__managed__Main�() Unknown The disassembly at the TEST__Main frame looks like this: 00007FF7CB5155B5 ?? ?? ?? 00007FF7CB5155B6 ?? ?? ?? 00007FF7CB5155B7 ?? ?? ?? 00007FF7CB5155B8 ?? ?? ?? leave end_6 end_6: call void [mscorlib]System.GC::Collect() 00007FF7CB5155B9 BA 02 00 00 00 mov edx,2 00007FF7CB5155BE E8 69 A0 FF FF call System_Private_CoreLib_System_Runtime_InternalCalls__RhCollect (07FF7CB50F62Ch) endfinally We ended up calling 4 bytes before what we were supposed to call. The hardware exception being thrown is 0xC000001D: Illegal Instruction. Reactions are currently unavailable Metadata Metadata Assignees jkotas Labels Runtime Type No type Projects No projects Milestone PreviewNo due date Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { // Highlight search terms from Google/DuckDuckGo/Bing referrer (function() { var ref = document.referrer; var terms = []; if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) { var url = new URL(ref); var q = url.searchParams.get('q') || url.searchParams.get('p'); if (q) { terms = q.split(/\s+/).filter(function(t) { return t.length > 2; }); } } if (terms.length === 0) return; var style = document.createElement('style'); style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }'; document.head.appendChild(style); function highlight(node) { if (node.nodeType === 3) { // text node var text = node.textContent; var found = false; terms.forEach(function(term) { var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', '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('^' + ".*" + ' FailFast: (InternalError): Runtime internal error · Issue #2254 · dotnet/corert · GitHub Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert Uh oh! There was an error while loading. Please reload this page. This repository was archived by the owner on Nov 1, 2020. It is now read-only. dotnet /corertPublic archive Notifications You must be signed in to change notification settings Fork 499 Star 2.9k Code Issues313 Pull requests0 Projects Wiki Security and quality0 Insights Additional navigation options Code Issues Pull requests Projects Wiki Security and quality Insights This repository was archived by the owner on Nov 1, 2020. It is now read-only. FailFast: (InternalError): Runtime internal error #2254 Copy link Copy link Closed #2271 Closed FailFast: (InternalError): Runtime internal error#2254 #2271 Copy link Assignees Labels Runtime Milestone Preview Description MichalStrehovsky opened on Nov 23, 2016 Issue body actions JIT\Directed\FaultHandlers\Nesting\Nesting test is hitting an issue with calling finally funclets: reproNative.exe!System_Private_CoreLib_Interop_mincore__RaiseFailFastException() Line 166 Unknown reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__FailFast_1() Line 232 Unknown reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__RuntimeFailFast() Line 188 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__FailFastViaClasslib() Line 177 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowHwEx() Line 530 Unknown reproNative.exe!RhpThrowHwEx() Line 106 Unknown > reproNative.exe!nesting_TEST__Main() Line 64 Unknown reproNative.exe!RhpCallFinallyFunclet() Line 597 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__InvokeSecondPass_0() Line 890 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__DispatchEx() Line 674 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowEx() Line 560 Unknown reproNative.exe!RhpThrowEx() Line 198 Unknown reproNative.exe!nesting_TEST__Main() Line 50 Unknown reproNative.exe!__managed__Main�() Unknown The disassembly at the TEST__Main frame looks like this: 00007FF7CB5155B5 ?? ?? ?? 00007FF7CB5155B6 ?? ?? ?? 00007FF7CB5155B7 ?? ?? ?? 00007FF7CB5155B8 ?? ?? ?? leave end_6 end_6: call void [mscorlib]System.GC::Collect() 00007FF7CB5155B9 BA 02 00 00 00 mov edx,2 00007FF7CB5155BE E8 69 A0 FF FF call System_Private_CoreLib_System_Runtime_InternalCalls__RhCollect (07FF7CB50F62Ch) endfinally We ended up calling 4 bytes before what we were supposed to call. The hardware exception being thrown is 0xC000001D: Illegal Instruction. Reactions are currently unavailable Metadata Metadata Assignees jkotas Labels Runtime Type No type Projects No projects Milestone PreviewNo due date Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , '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" + ' FailFast: (InternalError): Runtime internal error · Issue #2254 · dotnet/corert · GitHub Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert Uh oh! There was an error while loading. Please reload this page. This repository was archived by the owner on Nov 1, 2020. It is now read-only. dotnet /corertPublic archive Notifications You must be signed in to change notification settings Fork 499 Star 2.9k Code Issues313 Pull requests0 Projects Wiki Security and quality0 Insights Additional navigation options Code Issues Pull requests Projects Wiki Security and quality Insights This repository was archived by the owner on Nov 1, 2020. It is now read-only. FailFast: (InternalError): Runtime internal error #2254 Copy link Copy link Closed #2271 Closed FailFast: (InternalError): Runtime internal error#2254 #2271 Copy link Assignees Labels Runtime Milestone Preview Description MichalStrehovsky opened on Nov 23, 2016 Issue body actions JIT\Directed\FaultHandlers\Nesting\Nesting test is hitting an issue with calling finally funclets: reproNative.exe!System_Private_CoreLib_Interop_mincore__RaiseFailFastException() Line 166 Unknown reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__FailFast_1() Line 232 Unknown reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__RuntimeFailFast() Line 188 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__FailFastViaClasslib() Line 177 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowHwEx() Line 530 Unknown reproNative.exe!RhpThrowHwEx() Line 106 Unknown > reproNative.exe!nesting_TEST__Main() Line 64 Unknown reproNative.exe!RhpCallFinallyFunclet() Line 597 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__InvokeSecondPass_0() Line 890 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__DispatchEx() Line 674 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowEx() Line 560 Unknown reproNative.exe!RhpThrowEx() Line 198 Unknown reproNative.exe!nesting_TEST__Main() Line 50 Unknown reproNative.exe!__managed__Main�() Unknown The disassembly at the TEST__Main frame looks like this: 00007FF7CB5155B5 ?? ?? ?? 00007FF7CB5155B6 ?? ?? ?? 00007FF7CB5155B7 ?? ?? ?? 00007FF7CB5155B8 ?? ?? ?? leave end_6 end_6: call void [mscorlib]System.GC::Collect() 00007FF7CB5155B9 BA 02 00 00 00 mov edx,2 00007FF7CB5155BE E8 69 A0 FF FF call System_Private_CoreLib_System_Runtime_InternalCalls__RhCollect (07FF7CB50F62Ch) endfinally We ended up calling 4 bytes before what we were supposed to call. The hardware exception being thrown is 0xC000001D: Illegal Instruction. Reactions are currently unavailable Metadata Metadata Assignees jkotas Labels Runtime Type No type Projects No projects Milestone PreviewNo due date Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , '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('^' + ".*" + ' FailFast: (InternalError): Runtime internal error · Issue #2254 · dotnet/corert · GitHub Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert Uh oh! There was an error while loading. Please reload this page. This repository was archived by the owner on Nov 1, 2020. It is now read-only. dotnet /corertPublic archive Notifications You must be signed in to change notification settings Fork 499 Star 2.9k Code Issues313 Pull requests0 Projects Wiki Security and quality0 Insights Additional navigation options Code Issues Pull requests Projects Wiki Security and quality Insights This repository was archived by the owner on Nov 1, 2020. It is now read-only. FailFast: (InternalError): Runtime internal error #2254 Copy link Copy link Closed #2271 Closed FailFast: (InternalError): Runtime internal error#2254 #2271 Copy link Assignees Labels Runtime Milestone Preview Description MichalStrehovsky opened on Nov 23, 2016 Issue body actions JIT\Directed\FaultHandlers\Nesting\Nesting test is hitting an issue with calling finally funclets: reproNative.exe!System_Private_CoreLib_Interop_mincore__RaiseFailFastException() Line 166 Unknown reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__FailFast_1() Line 232 Unknown reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__RuntimeFailFast() Line 188 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__FailFastViaClasslib() Line 177 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowHwEx() Line 530 Unknown reproNative.exe!RhpThrowHwEx() Line 106 Unknown > reproNative.exe!nesting_TEST__Main() Line 64 Unknown reproNative.exe!RhpCallFinallyFunclet() Line 597 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__InvokeSecondPass_0() Line 890 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__DispatchEx() Line 674 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowEx() Line 560 Unknown reproNative.exe!RhpThrowEx() Line 198 Unknown reproNative.exe!nesting_TEST__Main() Line 50 Unknown reproNative.exe!__managed__Main�() Unknown The disassembly at the TEST__Main frame looks like this: 00007FF7CB5155B5 ?? ?? ?? 00007FF7CB5155B6 ?? ?? ?? 00007FF7CB5155B7 ?? ?? ?? 00007FF7CB5155B8 ?? ?? ?? leave end_6 end_6: call void [mscorlib]System.GC::Collect() 00007FF7CB5155B9 BA 02 00 00 00 mov edx,2 00007FF7CB5155BE E8 69 A0 FF FF call System_Private_CoreLib_System_Runtime_InternalCalls__RhCollect (07FF7CB50F62Ch) endfinally We ended up calling 4 bytes before what we were supposed to call. The hardware exception being thrown is 0xC000001D: Illegal Instruction. Reactions are currently unavailable Metadata Metadata Assignees jkotas Labels Runtime Type No type Projects No projects Milestone PreviewNo due date Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , '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); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' FailFast: (InternalError): Runtime internal error · Issue #2254 · dotnet/corert · GitHub Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert Uh oh! There was an error while loading. Please reload this page. This repository was archived by the owner on Nov 1, 2020. It is now read-only. dotnet /corertPublic archive Notifications You must be signed in to change notification settings Fork 499 Star 2.9k Code Issues313 Pull requests0 Projects Wiki Security and quality0 Insights Additional navigation options Code Issues Pull requests Projects Wiki Security and quality Insights This repository was archived by the owner on Nov 1, 2020. It is now read-only. FailFast: (InternalError): Runtime internal error #2254 Copy link Copy link Closed #2271 Closed FailFast: (InternalError): Runtime internal error#2254 #2271 Copy link Assignees Labels Runtime Milestone Preview Description MichalStrehovsky opened on Nov 23, 2016 Issue body actions JIT\Directed\FaultHandlers\Nesting\Nesting test is hitting an issue with calling finally funclets: reproNative.exe!System_Private_CoreLib_Interop_mincore__RaiseFailFastException() Line 166 Unknown reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__FailFast_1() Line 232 Unknown reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__RuntimeFailFast() Line 188 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__FailFastViaClasslib() Line 177 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowHwEx() Line 530 Unknown reproNative.exe!RhpThrowHwEx() Line 106 Unknown > reproNative.exe!nesting_TEST__Main() Line 64 Unknown reproNative.exe!RhpCallFinallyFunclet() Line 597 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__InvokeSecondPass_0() Line 890 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__DispatchEx() Line 674 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowEx() Line 560 Unknown reproNative.exe!RhpThrowEx() Line 198 Unknown reproNative.exe!nesting_TEST__Main() Line 50 Unknown reproNative.exe!__managed__Main�() Unknown The disassembly at the TEST__Main frame looks like this: 00007FF7CB5155B5 ?? ?? ?? 00007FF7CB5155B6 ?? ?? ?? 00007FF7CB5155B7 ?? ?? ?? 00007FF7CB5155B8 ?? ?? ?? leave end_6 end_6: call void [mscorlib]System.GC::Collect() 00007FF7CB5155B9 BA 02 00 00 00 mov edx,2 00007FF7CB5155BE E8 69 A0 FF FF call System_Private_CoreLib_System_Runtime_InternalCalls__RhCollect (07FF7CB50F62Ch) endfinally We ended up calling 4 bytes before what we were supposed to call. The hardware exception being thrown is 0xC000001D: Illegal Instruction. Reactions are currently unavailable Metadata Metadata Assignees jkotas Labels Runtime Type No type Projects No projects Milestone PreviewNo due date Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time. , 'i'); if (__m === '*' || __re.test(location.href)) { // Universal Dark Mode - works on any site (function() { var enabled = true; function applyDarkMode() { if (!enabled) return; // Create style element if it doesn't exist var style = document.getElementById('universal-dark-mode-style'); if (!style) { style = document.createElement('style'); style.id = 'universal-dark-mode-style'; document.head.appendChild(style); } // Dark mode CSS - inverts colors but preserves images/video style.textContent = ' /* Invert everything except media */ html { filter: invert(1) hue-rotate(180deg) !important; background: #1a1a2e !important; } /* Restore images, videos, iframes, canvas */ img, video, iframe, canvas, svg, picture, [style*="background-image"] { filter: invert(1) hue-rotate(180deg) !important; } /* Preserve specific elements that should not be inverted */ .no-dark-mode, .no-dark-mode *, [data-theme="light"], [data-theme="light"], .ace_editor, .ace_editor *, .CodeMirror, .CodeMirror *, .monaco-editor, .monaco-editor *, .markdown-body pre, .markdown-body pre *, .highlight, .highlight *, pre code, pre code * { filter: none !important; } /* Fix common UI elements */ .modal, .popup, .dropdown-menu, .tooltip, .popover { filter: invert(1) hue-rotate(180deg) !important; background: #2d2d44 !important; border-color: #444 !important; } /* Scrollbars */ ::-webkit-scrollbar { background: #1a1a2e !important; } ::-webkit-scrollbar-thumb { background: #444 !important; } ::-webkit-scrollbar-thumb:hover { background: #555 !important; } /* Selection */ ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; } ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; } '; } function removeDarkMode() { var style = document.getElementById('universal-dark-mode-style'); if (style) style.remove(); } // Toggle with Alt+Shift+D document.addEventListener('keydown', function(e) { if (e.altKey && e.shiftKey && e.key === 'D') { e.preventDefault(); enabled = !enabled; if (enabled) { applyDarkMode(); console.log('[Universal Dark Mode] Enabled'); } else { removeDarkMode(); console.log('[Universal Dark Mode] Disabled'); } } }); // Apply on load applyDarkMode(); // Re-apply on dynamic content var observer = new MutationObserver(function(mutations) { if (enabled && !document.getElementById('universal-dark-mode-style')) { applyDarkMode(); } }); observer.observe(document.head, { childList: true }); console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle'); })(); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })(); FailFast: (InternalError): Runtime internal error · Issue #2254 · dotnet/corert · GitHub Skip to contentNavigation Menu Sign inAppearance settings AI CODE CREATIONGitHub CopilotWrite better code with AI GitHub Copilot appDirect agents from issue to merge MCP RegistryIntegrate external tools DEVELOPER WORKFLOWSActionsAutomate any workflow CodespacesInstant dev environments IssuesPlan and track work Code ReviewManage code changes Code QualityEnforce quality at merge APPLICATION SECURITYGitHub Advanced SecurityFind and fix vulnerabilities Code securitySecure your code as you build Secret protectionStop leaks before they start EXPLOREWhy GitHub Documentation Blog Changelog Marketplace View all features BY COMPANY SIZEEnterprises Small and medium teams Startups Nonprofits BY USE CASEApp Modernization DevSecOps DevOps CI/CD View all use cases BY INDUSTRYHealthcare Financial services Manufacturing Government View all industries View all solutions EXPLORE BY TOPICAI Software Development DevOps Security View all topics EXPLORE BY TYPECustomer stories Events & webinars Ebooks & reports Business insights GitHub Skills SUPPORT & SERVICESDocumentation Customer support Community forum Trust center Partners View all resources COMMUNITYGitHub SponsorsFund open source developers PROGRAMSSecurity Lab Maintainer Community GitHub Stars Archive Program REPOSITORIESTopics Trending Collections ENTERPRISE SOLUTIONSEnterprise platformAI-powered developer platform AVAILABLE ADD-ONSGitHub Advanced SecurityEnterprise-grade security features Copilot for BusinessEnterprise-grade AI features Premium SupportEnterprise-grade 24/7 support Pricing Sign in Sign upAppearance settings You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert Uh oh! There was an error while loading. Please reload this page. This repository was archived by the owner on Nov 1, 2020. It is now read-only. dotnet /corertPublic archive Notifications You must be signed in to change notification settings Fork 499 Star 2.9k Code Issues313 Pull requests0 Projects Wiki Security and quality0 Insights Additional navigation options Code Issues Pull requests Projects Wiki Security and quality Insights This repository was archived by the owner on Nov 1, 2020. It is now read-only. FailFast: (InternalError): Runtime internal error #2254 Copy link Copy link Closed #2271 Closed FailFast: (InternalError): Runtime internal error#2254 #2271 Copy link Assignees Labels Runtime Milestone Preview Description MichalStrehovsky opened on Nov 23, 2016 Issue body actions JIT\Directed\FaultHandlers\Nesting\Nesting test is hitting an issue with calling finally funclets: reproNative.exe!System_Private_CoreLib_Interop_mincore__RaiseFailFastException() Line 166 Unknown reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__FailFast_1() Line 232 Unknown reproNative.exe!System_Private_CoreLib_System_RuntimeExceptionHelpers__RuntimeFailFast() Line 188 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__FailFastViaClasslib() Line 177 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowHwEx() Line 530 Unknown reproNative.exe!RhpThrowHwEx() Line 106 Unknown > reproNative.exe!nesting_TEST__Main() Line 64 Unknown reproNative.exe!RhpCallFinallyFunclet() Line 597 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__InvokeSecondPass_0() Line 890 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__DispatchEx() Line 674 Unknown reproNative.exe!System_Private_CoreLib_System_Runtime_EH__RhThrowEx() Line 560 Unknown reproNative.exe!RhpThrowEx() Line 198 Unknown reproNative.exe!nesting_TEST__Main() Line 50 Unknown reproNative.exe!__managed__Main�() Unknown The disassembly at the TEST__Main frame looks like this: 00007FF7CB5155B5 ?? ?? ?? 00007FF7CB5155B6 ?? ?? ?? 00007FF7CB5155B7 ?? ?? ?? 00007FF7CB5155B8 ?? ?? ?? leave end_6 end_6: call void [mscorlib]System.GC::Collect() 00007FF7CB5155B9 BA 02 00 00 00 mov edx,2 00007FF7CB5155BE E8 69 A0 FF FF call System_Private_CoreLib_System_Runtime_InternalCalls__RhCollect (07FF7CB50F62Ch) endfinally We ended up calling 4 bytes before what we were supposed to call. The hardware exception being thrown is 0xC000001D: Illegal Instruction. Reactions are currently unavailable Metadata Metadata Assignees jkotas Labels Runtime Type No type Projects No projects Milestone PreviewNo due date Relationships None yet Development No branches or pull requests Issue actions Footer © 2026 GitHub, Inc. Footer navigation Terms Privacy Security Status Community Docs Contact You can’t perform that action at this time.