dotnet · hoyosjs · Jun 9, 2026 · Apr 3, 2026 · Apr 9, 2026 · Apr 10, 2026
diff --git a/.github/copilot/settings.json b/.github/copilot/settings.json
@@ -0,0 +1,13 @@
+{
+  "extraKnownMarketplaces": {
+    "dotnet-arcade-skills": {
+      "source": {
+        "source": "github",
+        "repo": "dotnet/arcade-skills"
+      }
+    }
+  },
+  "enabledPlugins": {
+    "dotnet-dnceng@dotnet-arcade-skills": true
+  }
+}
diff --git a/.github/policies/resourceManagement.yml b/.github/policies/resourceManagement.yml
@@ -36,7 +36,7 @@ configuration:
           days: 3
       actions:
       - addReply:
-          reply: Hi @${issueAuthor}. We are closing this issue due to inactivity. If you comment within 30 days it will automatically reopen. If you are not the author of this issue and you're facing the same problem, feel free to open a new issue referencing this one.
+          reply: Hi ${issueAuthor}. We are closing this issue due to inactivity. If you comment within 30 days it will automatically reopen. If you are not the author of this issue and you're facing the same problem, feel free to open a new issue referencing this one.
       - closeIssue
     - description: '[Idle Issue Management] Add no recent activity label to issues'
       frequencies:
@@ -174,7 +174,7 @@ configuration:
           label: 'Needs: Author Feedback'
       then:
       - addReply:
-          reply: 'Hi @${issueAuthor}. We have added the "Needs: Author Feedback" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.'
+          reply: 'Hi ${issueAuthor}. We have added the "Needs: Author Feedback" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.'
       triggerOnOwnActions: false
 onFailure: 
 onSuccess: 
diff --git a/.github/skills/release-notes/SKILL.md b/.github/skills/release-notes/SKILL.md
@@ -0,0 +1,101 @@
+---
+name: release-notes
+description: Generate release notes for the dotnet/diagnostics repository. Use when asked to generate release notes, a release summary, or a changelog.
+---
+
+# Release Notes Generation
+
+## Process
+
+### 1. Determine the baseline
+
+Find the **last published GitHub release** — not the latest git tag. This repo may have many version tags (e.g., `v10.0.*`, `v11.0.*`) that don't correspond to published releases.
+
+```bash
+# Get the most recent published GitHub release tag for dotnet/diagnostics
+release_tag=$(gh release list --repo dotnet/diagnostics --limit 1 --json tagName --jq '.[0].tagName')
+echo "$release_tag"
+```
+
+The last published release may be on a different branch (e.g., `release/9.0`). Even so, use the tag directly in `git log` — **do NOT use `git merge-base`**. The release branch often contains snap/backport merges that bring `main` commits into the release, so `merge-base` returns an ancestor that is already included in the release tag. Instead:
+
+```bash
+# Correct: use the tag directly — git handles cross-branch reachability
+git log <release-tag>..HEAD --oneline --first-parent
+```
+
+This ensures commits already reachable from the release tag (via snap merges or backports) are excluded.
+
+### 2. Get the commit list
+
+List all first-parent commits from the release tag to HEAD, excluding dependency flow PRs:
+
+```bash
+git log <release-tag>..HEAD --oneline --first-parent
+```
+
+Filter out:
+- `[main] Update dependencies from *`
+- `Update dependencies from *`
+- Pure test infrastructure changes (test reorganization, CI image updates, SDK bumps)
+- Build/CI plumbing (SDK updates, pipeline config, dependabot changes)
+
+### 3. Investigate each PR
+
+For each user-facing PR, launch **parallel explore agents** (one per group of 3-5 related PRs) to read:
+- PR body (`get` method)
+- Review comments (`get_review_comments` method)
+- General comments (`get_comments` method)
+
+Focus on:
+- **What** user-visible behavior changed
+- **Why** — what issue it solves, what feature it adds
+- **Breaking changes** or UX surprises discussed in review threads
+- Concrete examples (before/after output, error messages)
+
+### 4. Write the release notes
+
+Follow the format used in the latest release to get a sense of the current format used. For example, for `v9.0.661903` the structure follows the following pattern:
+
+```markdown
+### General announcements
+
+Brief summary.
+
+### dotnet-dump / SOS
+
+- **Feature/fix name**: Description focusing on WHY and user impact. (#PR)
+
+#### SOS Bug Fixes
+
+- **Command affected**: What was wrong, what's fixed. (#PR)
+
+### dotnet-trace
+
+- **collect-linux improvements**: Group related sub-items.
+
+### dotnet-counters
+
+- **Feature**: Description. (#PR)
+
+### Microsoft.Diagnostics.NETCore.Client
+
+- **Feature**: Description. (#PR)
+
+### Other notable changes
+
+- Items that don't fit above categories.
+```
+
+### 5. Style guidelines
+
+- Focus on **why** a change matters to users, not implementation details
+- Include issue references where available: `([#1234](https://github.com/dotnet/diagnostics/issues/1234), #5678)`
+- Group related fixes (e.g., all `collect-linux` terminal fixes together)
+- Call out breaking changes or UX changes explicitly
+- Omit purely internal changes (refactors, test moves, CI config) unless they have user impact
+- Use bold for command names and flags: **`!dumpheap -stat -bycount`**
+
+## Example output
+
+See the release at https://github.com/dotnet/diagnostics/releases/tag/v9.0.661903 for format reference.
diff --git a/Directory.Build.props b/Directory.Build.props
@@ -14,6 +14,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
+    <RepositoryUrl>https://github.com/dotnet/diagnostics</RepositoryUrl>
     <PackageIconUrl>http://go.microsoft.com/fwlink/?LinkID=288859</PackageIconUrl>
     <RepositoryType>git</RepositoryType>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
@@ -72,7 +73,7 @@
     <NetCoreAppMinVersion>8.0</NetCoreAppMinVersion>
     <NetCoreAppMinTargetFramework>net$(NetCoreAppMinVersion)</NetCoreAppMinTargetFramework>
     <!-- This is the list of TFMs we build our debuggees and tracees as. -->
-    <SupportedSubProcessTargetFrameworks>net8.0;net9.0;net10.0</SupportedSubProcessTargetFrameworks>
+    <SupportedSubProcessTargetFrameworks>net8.0;net9.0;net10.0;net11.0</SupportedSubProcessTargetFrameworks>
     <!-- This is the list of TFMs we build our unit tests as. -->
     <SupportedXUnitTestTargetFrameworks>net8.0</SupportedXUnitTestTargetFrameworks>
     <!-- Arcade wants to be opinionated and use embedded PDBs for CI/local builds.

diff --git a/NuGet.config b/NuGet.config
@@ -13,6 +13,8 @@
     <!--  Begin: Package sources from dotnet-runtime -->
     <!--  End: Package sources from dotnet-runtime -->
     <!--End: Package sources managed by Dependency Flow automation. Do not edit the sources above.-->
+    <add key="dotnet11" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet11/nuget/v3/index.json" />
+    <add key="dotnet11-transport" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet11-transport/nuget/v3/index.json" />
     <add key="dotnet10" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet10/nuget/v3/index.json" />
     <add key="dotnet10-transport" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet10-transport/nuget/v3/index.json" />
     <add key="dotnet9" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet9/nuget/v3/index.json" />

diff --git a/build.sln b/build.sln
@@ -91,6 +91,12 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "GCPOH", "src\tests\SOS.Unit
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "GCWhere", "src\tests\SOS.UnitTests\Debuggees\GCWhere\GCWhere.csproj", "{BCBCA951-17AC-43C3-BC1F-ED8137C08923}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "InterpreterStackInterleavedTest", "src\tests\SOS.UnitTests\Debuggees\InterpreterStackInterleavedTest\InterpreterStackInterleavedTest.csproj", "{89B0E999-8ED6-442B-B813-6B85DE1A779C}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Trampoline", "src\tests\SOS.UnitTests\Debuggees\InterpreterStackInterleavedTest\Trampoline\Trampoline.csproj", "{34467429-F20A-4EE0-A895-25A601F28AFC}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "InterpreterStackTest", "src\tests\SOS.UnitTests\Debuggees\InterpreterStackTest\InterpreterStackTest.csproj", "{0D4641C7-EA69-41EC-847A-16266D2A40F8}"
+EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "LineNums", "src\tests\SOS.UnitTests\Debuggees\LineNums\LineNums.csproj", "{D39F4E7C-558C-4697-8692-9DD92DB97D92}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MiniDumpLocalVarLookup", "src\tests\SOS.UnitTests\Debuggees\MiniDumpLocalVarLookup\MiniDumpLocalVarLookup.csproj", "{57A8B0FF-5FD9-4E8E-806F-3F25E30B3E74}"
@@ -1021,6 +1027,60 @@ Global
 		{BCBCA951-17AC-43C3-BC1F-ED8137C08923}.RelWithDebInfo|Any CPU.ActiveCfg = Debug|Any CPU
 		{BCBCA951-17AC-43C3-BC1F-ED8137C08923}.RelWithDebInfo|x64.ActiveCfg = Debug|Any CPU
 		{BCBCA951-17AC-43C3-BC1F-ED8137C08923}.RelWithDebInfo|x86.ActiveCfg = Debug|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Debug|x64.Build.0 = Debug|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Debug|x86.Build.0 = Debug|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Release|x64.ActiveCfg = Release|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Release|x64.Build.0 = Release|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Release|x86.ActiveCfg = Release|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Release|x86.Build.0 = Release|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Checked|Any CPU.ActiveCfg = Debug|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Checked|x64.ActiveCfg = Debug|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.Checked|x86.ActiveCfg = Debug|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.RelWithDebInfo|Any CPU.ActiveCfg = Debug|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.RelWithDebInfo|x64.ActiveCfg = Debug|Any CPU
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C}.RelWithDebInfo|x86.ActiveCfg = Debug|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Debug|x64.Build.0 = Debug|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Debug|x86.Build.0 = Debug|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Release|x64.ActiveCfg = Release|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Release|x64.Build.0 = Release|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Release|x86.ActiveCfg = Release|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Release|x86.Build.0 = Release|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Checked|Any CPU.ActiveCfg = Debug|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Checked|x64.ActiveCfg = Debug|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.Checked|x86.ActiveCfg = Debug|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.RelWithDebInfo|Any CPU.ActiveCfg = Debug|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.RelWithDebInfo|x64.ActiveCfg = Debug|Any CPU
+		{34467429-F20A-4EE0-A895-25A601F28AFC}.RelWithDebInfo|x86.ActiveCfg = Debug|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Debug|x64.Build.0 = Debug|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Debug|x86.Build.0 = Debug|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Release|x64.ActiveCfg = Release|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Release|x64.Build.0 = Release|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Release|x86.ActiveCfg = Release|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Release|x86.Build.0 = Release|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Checked|Any CPU.ActiveCfg = Debug|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Checked|x64.ActiveCfg = Debug|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.Checked|x86.ActiveCfg = Debug|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.RelWithDebInfo|Any CPU.ActiveCfg = Debug|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.RelWithDebInfo|x64.ActiveCfg = Debug|Any CPU
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8}.RelWithDebInfo|x86.ActiveCfg = Debug|Any CPU
 		{D39F4E7C-558C-4697-8692-9DD92DB97D92}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{D39F4E7C-558C-4697-8692-9DD92DB97D92}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{D39F4E7C-558C-4697-8692-9DD92DB97D92}.Debug|x64.ActiveCfg = Debug|Any CPU
@@ -1506,6 +1566,9 @@ Global
 		{79B6C88E-00FC-4990-A4AC-1EB1549F3542} = {C02DE277-7341-4C63-B105-BA695F40277F}
 		{C69F541A-82B2-4545-A371-72D38218C569} = {C02DE277-7341-4C63-B105-BA695F40277F}
 		{BCBCA951-17AC-43C3-BC1F-ED8137C08923} = {C02DE277-7341-4C63-B105-BA695F40277F}
+		{89B0E999-8ED6-442B-B813-6B85DE1A779C} = {C02DE277-7341-4C63-B105-BA695F40277F}
+		{34467429-F20A-4EE0-A895-25A601F28AFC} = {C02DE277-7341-4C63-B105-BA695F40277F}
+		{0D4641C7-EA69-41EC-847A-16266D2A40F8} = {C02DE277-7341-4C63-B105-BA695F40277F}
 		{D39F4E7C-558C-4697-8692-9DD92DB97D92} = {C02DE277-7341-4C63-B105-BA695F40277F}
 		{57A8B0FF-5FD9-4E8E-806F-3F25E30B3E74} = {C02DE277-7341-4C63-B105-BA695F40277F}
 		{A39F9BC5-892F-4B68-9B2A-C9EF99EEDBF0} = {C02DE277-7341-4C63-B105-BA695F40277F}

diff --git a/diagnostics.yml b/diagnostics.yml
@@ -251,21 +251,21 @@ extends:
               - configuration: Debug
                 architecture: x64
 
-        - ${{ if ne(variables['System.TeamProject'], 'public') }}:
-          - template: /eng/pipelines/build.yml
-            parameters:
-              jobTemplate: ${{ variables.jobTemplate }}
-              name: Fedora_43
-              osGroup: Linux
-              container: test_fedora
-              dependsOn: Linux
-              testOnly: true
-              buildConfigs:
-              - configuration: Release
-                architecture: x64
-              - ${{ if in(variables['Build.Reason'], 'PullRequest') }}:
-                - configuration: Debug
-                  architecture: x64
+        # - ${{ if ne(variables['System.TeamProject'], 'public') }}:
+        #   - template: /eng/pipelines/build.yml
+        #     parameters:
+        #       jobTemplate: ${{ variables.jobTemplate }}
+        #       name: Fedora_43
+        #       osGroup: Linux
+        #       container: test_fedora
+        #       dependsOn: Linux
+        #       testOnly: true
+        #       buildConfigs:
+        #       - configuration: Release
+        #         architecture: x64
+        #       - ${{ if in(variables['Build.Reason'], 'PullRequest') }}:
+        #         - configuration: Debug
+        #           architecture: x64
 
     - ${{ if and(ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
       - stage: package

@@ -54,3 +54,18 @@ Because the DAC is not properly signed for a private runtime build there are a c
 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\MiniDumpAuxiliaryDlls]
 "C:\diagnostics\.dotnet\shared\Microsoft.NETCore.App\5.0.0-alpha.1.20102.3\coreclr.dll"="C:\diagnostics\.dotnet\shared\Microsoft.NETCore.App\5.0.0-alpha.1.20102.3\mscordaccore.dll"
 ```
+
+#### Interpreter-frame tests
+
+The interpreter-frame SOS tests (`SOSInterpreterTests`) are skipped by default because `FEATURE_INTERPRETER` is only compiled into Debug/Checked CoreCLR drops (see `src/coreclr/clrfeatures.cmake` in dotnet/runtime) and is therefore unavailable on the public Release runtimes the SOS tests download by default.
+
+The opt-in is layered:
+
+1. **Per-debuggee csproj flag.** `Debuggees/InterpreterStackTest/InterpreterStackTest.csproj` declares `<InterpreterTest>true</InterpreterTest>` to mark itself as an interpreter SOS test. Methods that should run on the interpreter follow the convention of being named with the prefix `InterpTestMethod` (e.g. `InterpTestMethodRunNested`). The csproj does not need to specify the method-name pattern; it is shared across all interpreter-test debuggees.
+2. **Per-test gate.** `SOS_TEST_INTERPRETER=true` (or `-testInterpreter` to `Build.cmd`/`build.sh`) unskips the `SOSInterpreterTests.InterpreterStackTest` test method. SOSRunner sets `DOTNET_Interpreter=InterpTestMethod*` on the debuggee process at launch when this gate is on. The shared `Debuggees/Directory.Build.targets` additionally no-ops any direct `dotnet build` of an interpreter-test debuggee when the gate is unset, emitting a message rather than producing a binary that wouldn't exercise the interpreter. Other SOS tests are unaffected.
+
+To run them:
+
+1. Build the runtime as Checked: `build.cmd -subset clr -c Checked` (or `-c Debug`).
+2. Overlay that drop onto each `artifacts\dotnet-test\shared\Microsoft.NETCore.App\<version>` directory exactly as for any private build (see the example scripts above).
+3. Set `SOS_TEST_INTERPRETER=true` (or pass `-testInterpreter` to `Build.cmd`/`build.sh` when running with `-test`).
diff --git a/dotnet.cmd b/dotnet.cmd
@@ -14,9 +14,6 @@ set /p dotnetPath=<%~dp0artifacts\toolset\sdk.txt
 :: misleading value (such as 'MCD' in HP PCs) may lead to build breakage (issue: #69).
 set Platform=
 
-:: Don't resolve runtime, shared framework, or SDK from other locations to ensure build determinism
-set DOTNET_MULTILEVEL_LOOKUP=0
-
 :: Disable first run since we want to control all package sources
 set DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1
 

diff --git a/dotnet.sh b/dotnet.sh
@@ -12,9 +12,6 @@ while [[ -h $source ]]; do
 done
 scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"
 
-# Don't resolve runtime, shared framework, or SDK from other locations to ensure build determinism
-export DOTNET_MULTILEVEL_LOOKUP=0
-
 # Disable first run since we want to control all package sources
 export DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1