[ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_ [Content truncated due to length] #132913

Open
Open
[ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_ [Content truncated due to length]#132913
Labels
Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner

Description

@github-actions
github-actions
bot
opened on Aug 29, 2026

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1569716
Build error leg or test failing: iossimulator-arm64 Release AllSubsets_Mono - Build product (src/native/minipal/conditionvariable.c)

KBE authoring guidance (ci-failure-scan)
  • Error Details is for readers. Paste the full exception, stack trace, or build error excerpt so the failure is understandable without opening the raw log.
  • Build Analysis parses only the single JSON block under Error Message.
  • ErrorMessage is a case-sensitive ordinal String.Contains substring copied verbatim from the failing log.
  • Set BuildRetry to true only for a clear infrastructure retry case. ExcludeConsoleLog disables Helix console-log scanning.

Error Details

The runtime-extra-platforms pipeline (definition 154) fails to build the Mono runtime for iossimulator-arm64 because pthread_cond_timedwait_relative_np is called without a declaration. The compiler treats the implicit function declaration as an error (-Werror=implicit-function-declaration), breaking the minipal_objects target and thus Build product.

The failure is stable: absent from build 1567845 (2026-08-26), first seen in build 1569716 (2026-08-27), and still present in the follow-up build 1571812 (2026-08-28). It originates in src/native/minipal/conditionvariable.c:115, guarded by #if HAVE_CLOCK_GETTIME_NSEC_NP.

[45/388] Building C object mono/minipal/minipal/CMakeFiles/minipal_objects.dir/conditionvariable.c.o
/Users/runner/work/1/s/src/native/minipal/conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
115 | error = pthread_cond_timedwait_relative_np(&condition->_impl, mutex, &timeout);
1 error generated.
##[error]src/mono/mono.proj(572,5): error MSB3073: The command " cmake --build . --target install --config Release" exited with code 1.

Error Message

{
"ErrorMessage": "conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
Agentic workflow metadata (ci-failure-scan)

Workflow artifact: ci-failure-scan
Artifact kind: kbe-verification
Verified match count: 1 hit in failure.log
First build it occurred: 1569716 (2026-08-27)

Generated by CI Outer-Loop Failure Scanner · opus48 · 907.6 AIC · ⌖ 11.7 AIC · ⊞ 20.7K · ◷

Report

BuildRepositoryStep NameConsole logPull Request
1574779dotnet/runtimeBuild productLog#132740
1574376dotnet/runtimeBuild productLog
1574051dotnet/runtimeBuild productLog
1573540dotnet/runtimeBuild productLog

Summary

24-Hour Hit Count7-Day Hit Count1-Month Count
044

Metadata

Metadata

Assignees

No one assigned

    Labels

    Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner

    Type

    No type

    Projects

    No projects

      Milestone

      No milestone

      Relationships

      None yet

      Development

      No branches or pull requests

      Issue actions

      , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
       blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n 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;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

      Skip to content
      [ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_
[Content truncated due to length] #132913
      Open
      Open
      [ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_
[Content truncated due to length]#132913
      Labels
      Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner
      Description
      @github-actions
      github-actions
      bot
      opened on Aug 29, 2026
      Build Information
      Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1569716
      
Build error leg or test failing: iossimulator-arm64 Release AllSubsets_Mono - Build product (src/native/minipal/conditionvariable.c)
      KBE authoring guidance (ci-failure-scan)
      • Error Details is for readers. Paste the full exception, stack trace, or build error excerpt so the failure is understandable without opening the raw log.
      • Build Analysis parses only the single JSON block under Error Message.
      • ErrorMessage is a case-sensitive ordinal String.Contains substring copied verbatim from the failing log.
      • Set BuildRetry to true only for a clear infrastructure retry case. ExcludeConsoleLog disables Helix console-log scanning.
      Error Details
      The runtime-extra-platforms pipeline (definition 154) fails to build the Mono runtime for iossimulator-arm64 because pthread_cond_timedwait_relative_np is called without a declaration. The compiler treats the implicit function declaration as an error (-Werror=implicit-function-declaration), breaking the minipal_objects target and thus Build product.
      The failure is stable: absent from build 1567845 (2026-08-26), first seen in build 1569716 (2026-08-27), and still present in the follow-up build 1571812 (2026-08-28). It originates in src/native/minipal/conditionvariable.c:115, guarded by #if HAVE_CLOCK_GETTIME_NSEC_NP.
      [45/388] Building C object mono/minipal/minipal/CMakeFiles/minipal_objects.dir/conditionvariable.c.o
/Users/runner/work/1/s/src/native/minipal/conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
115 | error = pthread_cond_timedwait_relative_np(&condition->_impl, mutex, &timeout);
1 error generated.
##[error]src/mono/mono.proj(572,5): error MSB3073: The command " cmake --build . --target install --config Release" exited with code 1.

      Error Message
      {
"ErrorMessage": "conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
      Agentic workflow metadata (ci-failure-scan)
      Workflow artifact: ci-failure-scan
      
Artifact kind: kbe-verification
      
Verified match count: 1 hit in failure.log
      
First build it occurred: 1569716 (2026-08-27)
      Generated by CI Outer-Loop Failure Scanner · opus48 · 907.6 AIC · ⌖ 11.7 AIC · ⊞ 20.7K · ◷
      Report
      BuildRepositoryStep NameConsole logPull Request
      1574779dotnet/runtimeBuild productLog#132740
      1574376dotnet/runtimeBuild productLog
      1574051dotnet/runtimeBuild productLog
      1573540dotnet/runtimeBuild productLog
      Summary
      24-Hour Hit Count7-Day Hit Count1-Month Count
      044
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner
        Type
        No type
        Projects
        No projects
          Milestone
          No milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

          Skip to content
          [ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_
[Content truncated due to length] #132913
          Open
          Open
          [ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_
[Content truncated due to length]#132913
          Labels
          Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner
          Description
          @github-actions
          github-actions
          bot
          opened on Aug 29, 2026
          Build Information
          Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1569716
          
Build error leg or test failing: iossimulator-arm64 Release AllSubsets_Mono - Build product (src/native/minipal/conditionvariable.c)
          KBE authoring guidance (ci-failure-scan)
          • Error Details is for readers. Paste the full exception, stack trace, or build error excerpt so the failure is understandable without opening the raw log.
          • Build Analysis parses only the single JSON block under Error Message.
          • ErrorMessage is a case-sensitive ordinal String.Contains substring copied verbatim from the failing log.
          • Set BuildRetry to true only for a clear infrastructure retry case. ExcludeConsoleLog disables Helix console-log scanning.
          Error Details
          The runtime-extra-platforms pipeline (definition 154) fails to build the Mono runtime for iossimulator-arm64 because pthread_cond_timedwait_relative_np is called without a declaration. The compiler treats the implicit function declaration as an error (-Werror=implicit-function-declaration), breaking the minipal_objects target and thus Build product.
          The failure is stable: absent from build 1567845 (2026-08-26), first seen in build 1569716 (2026-08-27), and still present in the follow-up build 1571812 (2026-08-28). It originates in src/native/minipal/conditionvariable.c:115, guarded by #if HAVE_CLOCK_GETTIME_NSEC_NP.
          [45/388] Building C object mono/minipal/minipal/CMakeFiles/minipal_objects.dir/conditionvariable.c.o
/Users/runner/work/1/s/src/native/minipal/conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
115 | error = pthread_cond_timedwait_relative_np(&condition->_impl, mutex, &timeout);
1 error generated.
##[error]src/mono/mono.proj(572,5): error MSB3073: The command " cmake --build . --target install --config Release" exited with code 1.

          Error Message
          {
"ErrorMessage": "conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
          Agentic workflow metadata (ci-failure-scan)
          Workflow artifact: ci-failure-scan
          
Artifact kind: kbe-verification
          
Verified match count: 1 hit in failure.log
          
First build it occurred: 1569716 (2026-08-27)
          Generated by CI Outer-Loop Failure Scanner · opus48 · 907.6 AIC · ⌖ 11.7 AIC · ⊞ 20.7K · ◷
          Report
          BuildRepositoryStep NameConsole logPull Request
          1574779dotnet/runtimeBuild productLog#132740
          1574376dotnet/runtimeBuild productLog
          1574051dotnet/runtimeBuild productLog
          1573540dotnet/runtimeBuild productLog
          Summary
          24-Hour Hit Count7-Day Hit Count1-Month Count
          044
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner
            Type
            No type
            Projects
            No projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              [ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_
[Content truncated due to length] #132913
              Open
              Open
              [ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_
[Content truncated due to length]#132913
              Labels
              Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner
              Description
              @github-actions
              github-actions
              bot
              opened on Aug 29, 2026
              Build Information
              Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1569716
              
Build error leg or test failing: iossimulator-arm64 Release AllSubsets_Mono - Build product (src/native/minipal/conditionvariable.c)
              KBE authoring guidance (ci-failure-scan)
              • Error Details is for readers. Paste the full exception, stack trace, or build error excerpt so the failure is understandable without opening the raw log.
              • Build Analysis parses only the single JSON block under Error Message.
              • ErrorMessage is a case-sensitive ordinal String.Contains substring copied verbatim from the failing log.
              • Set BuildRetry to true only for a clear infrastructure retry case. ExcludeConsoleLog disables Helix console-log scanning.
              Error Details
              The runtime-extra-platforms pipeline (definition 154) fails to build the Mono runtime for iossimulator-arm64 because pthread_cond_timedwait_relative_np is called without a declaration. The compiler treats the implicit function declaration as an error (-Werror=implicit-function-declaration), breaking the minipal_objects target and thus Build product.
              The failure is stable: absent from build 1567845 (2026-08-26), first seen in build 1569716 (2026-08-27), and still present in the follow-up build 1571812 (2026-08-28). It originates in src/native/minipal/conditionvariable.c:115, guarded by #if HAVE_CLOCK_GETTIME_NSEC_NP.
              [45/388] Building C object mono/minipal/minipal/CMakeFiles/minipal_objects.dir/conditionvariable.c.o
/Users/runner/work/1/s/src/native/minipal/conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
115 | error = pthread_cond_timedwait_relative_np(&condition->_impl, mutex, &timeout);
1 error generated.
##[error]src/mono/mono.proj(572,5): error MSB3073: The command " cmake --build . --target install --config Release" exited with code 1.

              Error Message
              {
"ErrorMessage": "conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
              Agentic workflow metadata (ci-failure-scan)
              Workflow artifact: ci-failure-scan
              
Artifact kind: kbe-verification
              
Verified match count: 1 hit in failure.log
              
First build it occurred: 1569716 (2026-08-27)
              Generated by CI Outer-Loop Failure Scanner · opus48 · 907.6 AIC · ⌖ 11.7 AIC · ⊞ 20.7K · ◷
              Report
              BuildRepositoryStep NameConsole logPull Request
              1574779dotnet/runtimeBuild productLog#132740
              1574376dotnet/runtimeBuild productLog
              1574051dotnet/runtimeBuild productLog
              1573540dotnet/runtimeBuild productLog
              Summary
              24-Hour Hit Count7-Day Hit Count1-Month Count
              044
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

                  Skip to content
                  [ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_
[Content truncated due to length] #132913
                  Open
                  Open
                  [ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_
[Content truncated due to length]#132913
                  Labels
                  Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner
                  Description
                  @github-actions
                  github-actions
                  bot
                  opened on Aug 29, 2026
                  Build Information
                  Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1569716
                  
Build error leg or test failing: iossimulator-arm64 Release AllSubsets_Mono - Build product (src/native/minipal/conditionvariable.c)
                  KBE authoring guidance (ci-failure-scan)
                  • Error Details is for readers. Paste the full exception, stack trace, or build error excerpt so the failure is understandable without opening the raw log.
                  • Build Analysis parses only the single JSON block under Error Message.
                  • ErrorMessage is a case-sensitive ordinal String.Contains substring copied verbatim from the failing log.
                  • Set BuildRetry to true only for a clear infrastructure retry case. ExcludeConsoleLog disables Helix console-log scanning.
                  Error Details
                  The runtime-extra-platforms pipeline (definition 154) fails to build the Mono runtime for iossimulator-arm64 because pthread_cond_timedwait_relative_np is called without a declaration. The compiler treats the implicit function declaration as an error (-Werror=implicit-function-declaration), breaking the minipal_objects target and thus Build product.
                  The failure is stable: absent from build 1567845 (2026-08-26), first seen in build 1569716 (2026-08-27), and still present in the follow-up build 1571812 (2026-08-28). It originates in src/native/minipal/conditionvariable.c:115, guarded by #if HAVE_CLOCK_GETTIME_NSEC_NP.
                  [45/388] Building C object mono/minipal/minipal/CMakeFiles/minipal_objects.dir/conditionvariable.c.o
/Users/runner/work/1/s/src/native/minipal/conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
115 | error = pthread_cond_timedwait_relative_np(&condition->_impl, mutex, &timeout);
1 error generated.
##[error]src/mono/mono.proj(572,5): error MSB3073: The command " cmake --build . --target install --config Release" exited with code 1.

                  Error Message
                  {
"ErrorMessage": "conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
                  Agentic workflow metadata (ci-failure-scan)
                  Workflow artifact: ci-failure-scan
                  
Artifact kind: kbe-verification
                  
Verified match count: 1 hit in failure.log
                  
First build it occurred: 1569716 (2026-08-27)
                  Generated by CI Outer-Loop Failure Scanner · opus48 · 907.6 AIC · ⌖ 11.7 AIC · ⊞ 20.7K · ◷
                  Report
                  BuildRepositoryStep NameConsole logPull Request
                  1574779dotnet/runtimeBuild productLog#132740
                  1574376dotnet/runtimeBuild productLog
                  1574051dotnet/runtimeBuild productLog
                  1573540dotnet/runtimeBuild productLog
                  Summary
                  24-Hour Hit Count7-Day Hit Count1-Month Count
                  044
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                      Skip to content
                      [ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_
[Content truncated due to length] #132913
                      Open
                      Open
                      [ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_
[Content truncated due to length]#132913
                      Labels
                      Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner
                      Description
                      @github-actions
                      github-actions
                      bot
                      opened on Aug 29, 2026
                      Build Information
                      Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1569716
                      
Build error leg or test failing: iossimulator-arm64 Release AllSubsets_Mono - Build product (src/native/minipal/conditionvariable.c)
                      KBE authoring guidance (ci-failure-scan)
                      • Error Details is for readers. Paste the full exception, stack trace, or build error excerpt so the failure is understandable without opening the raw log.
                      • Build Analysis parses only the single JSON block under Error Message.
                      • ErrorMessage is a case-sensitive ordinal String.Contains substring copied verbatim from the failing log.
                      • Set BuildRetry to true only for a clear infrastructure retry case. ExcludeConsoleLog disables Helix console-log scanning.
                      Error Details
                      The runtime-extra-platforms pipeline (definition 154) fails to build the Mono runtime for iossimulator-arm64 because pthread_cond_timedwait_relative_np is called without a declaration. The compiler treats the implicit function declaration as an error (-Werror=implicit-function-declaration), breaking the minipal_objects target and thus Build product.
                      The failure is stable: absent from build 1567845 (2026-08-26), first seen in build 1569716 (2026-08-27), and still present in the follow-up build 1571812 (2026-08-28). It originates in src/native/minipal/conditionvariable.c:115, guarded by #if HAVE_CLOCK_GETTIME_NSEC_NP.
                      [45/388] Building C object mono/minipal/minipal/CMakeFiles/minipal_objects.dir/conditionvariable.c.o
/Users/runner/work/1/s/src/native/minipal/conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
115 | error = pthread_cond_timedwait_relative_np(&condition->_impl, mutex, &timeout);
1 error generated.
##[error]src/mono/mono.proj(572,5): error MSB3073: The command " cmake --build . --target install --config Release" exited with code 1.

                      Error Message
                      {
"ErrorMessage": "conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
                      Agentic workflow metadata (ci-failure-scan)
                      Workflow artifact: ci-failure-scan
                      
Artifact kind: kbe-verification
                      
Verified match count: 1 hit in failure.log
                      
First build it occurred: 1569716 (2026-08-27)
                      Generated by CI Outer-Loop Failure Scanner · opus48 · 907.6 AIC · ⌖ 11.7 AIC · ⊞ 20.7K · ◷
                      Report
                      BuildRepositoryStep NameConsole logPull Request
                      1574779dotnet/runtimeBuild productLog#132740
                      1574376dotnet/runtimeBuild productLog
                      1574051dotnet/runtimeBuild productLog
                      1573540dotnet/runtimeBuild productLog
                      Summary
                      24-Hour Hit Count7-Day Hit Count1-Month Count
                      044
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner
                        Type
                        No type
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                          Skip to content
                          [ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_
[Content truncated due to length] #132913
                          Open
                          Open
                          [ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_
[Content truncated due to length]#132913
                          Labels
                          Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner
                          Description
                          @github-actions
                          github-actions
                          bot
                          opened on Aug 29, 2026
                          Build Information
                          Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1569716
                          
Build error leg or test failing: iossimulator-arm64 Release AllSubsets_Mono - Build product (src/native/minipal/conditionvariable.c)
                          KBE authoring guidance (ci-failure-scan)
                          • Error Details is for readers. Paste the full exception, stack trace, or build error excerpt so the failure is understandable without opening the raw log.
                          • Build Analysis parses only the single JSON block under Error Message.
                          • ErrorMessage is a case-sensitive ordinal String.Contains substring copied verbatim from the failing log.
                          • Set BuildRetry to true only for a clear infrastructure retry case. ExcludeConsoleLog disables Helix console-log scanning.
                          Error Details
                          The runtime-extra-platforms pipeline (definition 154) fails to build the Mono runtime for iossimulator-arm64 because pthread_cond_timedwait_relative_np is called without a declaration. The compiler treats the implicit function declaration as an error (-Werror=implicit-function-declaration), breaking the minipal_objects target and thus Build product.
                          The failure is stable: absent from build 1567845 (2026-08-26), first seen in build 1569716 (2026-08-27), and still present in the follow-up build 1571812 (2026-08-28). It originates in src/native/minipal/conditionvariable.c:115, guarded by #if HAVE_CLOCK_GETTIME_NSEC_NP.
                          [45/388] Building C object mono/minipal/minipal/CMakeFiles/minipal_objects.dir/conditionvariable.c.o
/Users/runner/work/1/s/src/native/minipal/conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
115 | error = pthread_cond_timedwait_relative_np(&condition->_impl, mutex, &timeout);
1 error generated.
##[error]src/mono/mono.proj(572,5): error MSB3073: The command " cmake --build . --target install --config Release" exited with code 1.

                          Error Message
                          {
"ErrorMessage": "conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
                          Agentic workflow metadata (ci-failure-scan)
                          Workflow artifact: ci-failure-scan
                          
Artifact kind: kbe-verification
                          
Verified match count: 1 hit in failure.log
                          
First build it occurred: 1569716 (2026-08-27)
                          Generated by CI Outer-Loop Failure Scanner · opus48 · 907.6 AIC · ⌖ 11.7 AIC · ⊞ 20.7K · ◷
                          Report
                          BuildRepositoryStep NameConsole logPull Request
                          1574779dotnet/runtimeBuild productLog#132740
                          1574376dotnet/runtimeBuild productLog
                          1574051dotnet/runtimeBuild productLog
                          1573540dotnet/runtimeBuild productLog
                          Summary
                          24-Hour Hit Count7-Day Hit Count1-Month Count
                          044
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner
                            Type
                            No type
                            Projects
                            No projects
                              Milestone
                              No milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                              Skip to content
                              [ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_
[Content truncated due to length] #132913
                              Open
                              Open
                              [ci-scan] Build break: iossimulator-arm64 Mono fails compiling conditionvariable.c — undeclared pthread_cond_timedwait_relative_
[Content truncated due to length]#132913
                              Labels
                              Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner
                              Description
                              @github-actions
                              github-actions
                              bot
                              opened on Aug 29, 2026
                              Build Information
                              Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1569716
                              
Build error leg or test failing: iossimulator-arm64 Release AllSubsets_Mono - Build product (src/native/minipal/conditionvariable.c)
                              KBE authoring guidance (ci-failure-scan)
                              • Error Details is for readers. Paste the full exception, stack trace, or build error excerpt so the failure is understandable without opening the raw log.
                              • Build Analysis parses only the single JSON block under Error Message.
                              • ErrorMessage is a case-sensitive ordinal String.Contains substring copied verbatim from the failing log.
                              • Set BuildRetry to true only for a clear infrastructure retry case. ExcludeConsoleLog disables Helix console-log scanning.
                              Error Details
                              The runtime-extra-platforms pipeline (definition 154) fails to build the Mono runtime for iossimulator-arm64 because pthread_cond_timedwait_relative_np is called without a declaration. The compiler treats the implicit function declaration as an error (-Werror=implicit-function-declaration), breaking the minipal_objects target and thus Build product.
                              The failure is stable: absent from build 1567845 (2026-08-26), first seen in build 1569716 (2026-08-27), and still present in the follow-up build 1571812 (2026-08-28). It originates in src/native/minipal/conditionvariable.c:115, guarded by #if HAVE_CLOCK_GETTIME_NSEC_NP.
                              [45/388] Building C object mono/minipal/minipal/CMakeFiles/minipal_objects.dir/conditionvariable.c.o
/Users/runner/work/1/s/src/native/minipal/conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
115 | error = pthread_cond_timedwait_relative_np(&condition->_impl, mutex, &timeout);
1 error generated.
##[error]src/mono/mono.proj(572,5): error MSB3073: The command " cmake --build . --target install --config Release" exited with code 1.

                              Error Message
                              {
"ErrorMessage": "conditionvariable.c:115:17: error: call to undeclared function 'pthread_cond_timedwait_relative_np'",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
                              Agentic workflow metadata (ci-failure-scan)
                              Workflow artifact: ci-failure-scan
                              
Artifact kind: kbe-verification
                              
Verified match count: 1 hit in failure.log
                              
First build it occurred: 1569716 (2026-08-27)
                              Generated by CI Outer-Loop Failure Scanner · opus48 · 907.6 AIC · ⌖ 11.7 AIC · ⊞ 20.7K · ◷
                              Report
                              BuildRepositoryStep NameConsole logPull Request
                              1574779dotnet/runtimeBuild productLog#132740
                              1574376dotnet/runtimeBuild productLog
                              1574051dotnet/runtimeBuild productLog
                              1573540dotnet/runtimeBuild productLog
                              Summary
                              24-Hour Hit Count7-Day Hit Count1-Month Count
                              044
                              Metadata
                              Metadata
                              Assignees
                              No one assigned
                                Labels
                                Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-VM-meta-monoblocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'os-iosApple iOSuntriagedNew issue has not been triaged by the area owner
                                Type
                                No type
                                Projects
                                No projects
                                  Milestone
                                  No milestone
                                  Relationships
                                  None yet
                                  Development
                                  No branches or pull requests
                                  Issue actions