Re-enable Microsoft.Extensions.Hosting shutdown functional coverage in CI and harden shutdown startup/Helix/NET481 compatibility by Copilot · Pull Request #128252 · dotnet/runtime

Copilot · 2026-05-15T12:32:50Z

main PR

This PR now includes the full follow-up hardening required by CI feedback after re-enabling Microsoft.Extensions.Hosting functional shutdown coverage.

Final scope of changes

Re-enabled Hosting FunctionalTests in CI (removed CI gating/active issue suppression).
Updated shutdown test deployment to run from deployed output (AppContext.BaseDirectory) instead of source-tree project discovery.
Removed the load-bearing PreservePublishedApplicationForDebugging dependency by using a borrowed published app path that does not delete test output on cleanup.
Replaced external kill process usage in shutdown signaling with libc signal calls for Helix/minimal-image compatibility.
Resolved Unix SIGINT/SIGTERM numbers at runtime instead of hard-coding them, matching the runtime's platform-specific signal mapping approach.
Kept Unix cleanup best-effort and resilient:
- graceful termination first (SIGTERM)
- hard-kill fallback (Process.Kill()) when needed
- tolerance for missing process tools / constrained environments
Increased startup/shutdown wait windows to 180 seconds for stress/JIT-stress stability.
Increased the final shutdown exit grace period before escalation to Process.Kill() to 30 seconds, reducing false failures when the app has finished shutdown logging but needs a little longer to exit cleanly under load.
Fixed the shutdown test startup race by wiring output observation before DeployAsync() starts process output capture, so the initial Started line cannot be missed.
Fixed net481 compatibility by using Marshal.GetLastWin32Error().

Validation

./build.sh clr+libs -rc release succeeds.
./build.sh clr+libs+host -rc release -lc release succeeds.
Microsoft.Extensions.Hosting.Functional.Tests builds successfully for net481.
dotnet build /t:test Microsoft.Extensions.Hosting.Functional.Tests.csproj -c Release -f net11.0 /p:TestFilter=Microsoft.AspNetCore.Hosting.FunctionalTests.ShutdownTests passes (2/2).
CI-feedback-driven shutdown/process-cleanup paths were updated to match Helix/runtime constraints and avoid prior failure modes.

Agent-Logs-Url: https://github.com/dotnet/runtime/sessions/f2762648-8aaf-44cd-a0bb-269b2a6b371d Co-authored-by: rosebyte <14963300+rosebyte@users.noreply.github.com>

rosebyte · 2026-05-18T11:31:53Z

@copilot , the shutdown tests are failing with this error on helix machines:

Comments
{ "HelixJobId": "bf5b8a6f-0bdd-40b3-9fbc-f0eec7148f40", "HelixWorkItemName": "Microsoft.Extensions.Hosting.Functional.Tests" }

Error message
System.IO.DirectoryNotFoundException : Could not find Microsoft.Extensions.Hosting.TestApp.csproj from base directory '/root/helix/work/workitem/e/'.

Stack trace
at Microsoft.AspNetCore.Hosting.FunctionalTests.ShutdownTests.GetApplicationPath() in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/ShutdownTests.cs:line 173
at Microsoft.AspNetCore.Hosting.FunctionalTests.ShutdownTests.ExecuteShutdownTest(String testName, String shutdownMechanic) in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/ShutdownTests.cs:line 53
at Microsoft.AspNetCore.Hosting.FunctionalTests.ShutdownTests.ShutdownTestRun() in /_/src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/ShutdownTests.cs:line 35
--- End of stack trace from previous location ---

Agent-Logs-Url: https://github.com/dotnet/runtime/sessions/e8bb9c1b-1794-4ebc-a563-bec6823fec1c Co-authored-by: rosebyte <14963300+rosebyte@users.noreply.github.com>

Copilot · 2026-05-18T11:55:24Z

@copilot , the shutdown tests are failing with this error on helix machines:

...

Fixed in b9cd702. I removed the source-tree lookup and switched the shutdown tests to run TestApp from the deployed test output (AppContext.BaseDirectory) using a custom ApplicationPublisher, so Helix no longer requires Microsoft.Extensions.Hosting.TestApp.csproj to exist in the workitem.

rosebyte · 2026-05-19T07:33:11Z

@copilot , this time it failed with this error:

Test Failures (700 tests failed)
🔹 [All failing tests from runtime]

⚠️ 698 failing tests not displayed for this pipeline due to space limitations

❌ Microsoft.AspNetCore.Hosting.FunctionalTests.ShutdownTests.ShutdownTestRun [Console] [Details] [Artifacts] [0.70% failure rate]
[ 🚧 Create issue against infrastructure team] [ 📄 Create issue in this repo]
Failing Configuration
AzureLinux.3.0.ArmArch.Open
Exception Message
System.ComponentModel.Win32Exception : An error occurred trying to start process 'pgrep' with working directory '/root/helix/work/workitem/e'. No such file or directory
CallStack
at Microsoft.Win32.SafeHandles.SafeProcessHandle.ForkAndExecProcess(ProcessStartInfo startInfo, String resolvedFilename, String[] argv, IDictionary2 env, String cwd, Boolean setCredentials, UInt32 userId, UInt32 groupId, UInt32[] groups, SafeFileHandle stdinHandle, SafeFileHandle stdoutHandle, SafeFileHandle stderrHandle, Boolean usesTerminal, SafeHandle[] inheritedHandles, Holder& waitStateHolder, Boolean throwOnNoExec) in /_/src/libraries/System.Diagnostics.Process/src/Microsoft/Win32/SafeHandles/SafeProcessHandle.Unix.cs:line 369 at Microsoft.Win32.SafeHandles.SafeProcessHandle.StartCore(ProcessStartInfo startInfo, SafeFileHandle stdinHandle, SafeFileHandle stdoutHandle, SafeFileHandle stderrHandle, SafeHandle[] inheritedHandles, Holder& waitStateHolder) in /_/src/libraries/System.Diagnostics.Process/src/Microsoft/Win32/SafeHandles/SafeProcessHandle.Unix.cs:line 213 at System.Diagnostics.Process.StartCore(ProcessStartInfo startInfo, SafeFileHandle stdinHandle, SafeFileHandle stdoutHandle, SafeFileHandle stderrHandle, SafeHandle[] inheritedHandles) in /_/src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.Unix.cs:line 363 at System.Diagnostics.Process.Start() in /_/src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.cs:line 1272 at System.Diagnostics.Process.Start(ProcessStartInfo startInfo) in /_/src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.cs:line 1383 at Microsoft.Extensions.Internal.ProcessExtensions.RunProcessAndWaitForExit(String fileName, String arguments, TimeSpan timeout, String& stdout) in /_/src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/IntegrationTesting/src/ProcessExtensions.cs:line 93 at Microsoft.Extensions.Internal.ProcessExtensions.GetAllChildIdsUnix(Int32 parentId, ISet1 children, TimeSpan timeout) in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/IntegrationTesting/src/ProcessExtensions.cs:line 44
at Microsoft.Extensions.Internal.ProcessExtensions.KillTree(Process process, TimeSpan timeout) in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/IntegrationTesting/src/ProcessExtensions.cs:line 33
at Microsoft.Extensions.Internal.ProcessExtensions.KillTree(Process process) in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/IntegrationTesting/src/ProcessExtensions.cs:line 17
at Microsoft.Extensions.Hosting.IntegrationTesting.ApplicationDeployer.ShutDownIfAnyHostProcess(Process hostProcess) in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/IntegrationTesting/src/Deployers/ApplicationDeployer.cs:line 126
at Microsoft.Extensions.Hosting.IntegrationTesting.SelfHostDeployer.Dispose() in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/IntegrationTesting/src/Deployers/SelfHostDeployer.cs:line 179
at Microsoft.AspNetCore.Hosting.FunctionalTests.ShutdownTests.ExecuteShutdownTest(String testName, String shutdownMechanic) in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/ShutdownTests.cs:line 107
at Microsoft.AspNetCore.Hosting.FunctionalTests.ShutdownTests.ShutdownTestRun() in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/ShutdownTests.cs:line 34
--- End of stack trace from previous location ---
❌ Microsoft.AspNetCore.Hosting.FunctionalTests.ShutdownTests.ShutdownTestWaitForShutdown [Console] [Details] [Artifacts] [0.69% failure rate]
[ 🚧 Create issue against infrastructure team] [ 📄 Create issue in this repo]
Failing Configuration
AzureLinux.3.0.ArmArch.Open
Exception Message
System.ComponentModel.Win32Exception : An error occurred trying to start process 'pgrep' with working directory '/root/helix/work/workitem/e'. No such file or directory
CallStack
at Microsoft.Win32.SafeHandles.SafeProcessHandle.ForkAndExecProcess(ProcessStartInfo startInfo, String resolvedFilename, String[] argv, IDictionary2 env, String cwd, Boolean setCredentials, UInt32 userId, UInt32 groupId, UInt32[] groups, SafeFileHandle stdinHandle, SafeFileHandle stdoutHandle, SafeFileHandle stderrHandle, Boolean usesTerminal, SafeHandle[] inheritedHandles, Holder& waitStateHolder, Boolean throwOnNoExec) in /_/src/libraries/System.Diagnostics.Process/src/Microsoft/Win32/SafeHandles/SafeProcessHandle.Unix.cs:line 369 at Microsoft.Win32.SafeHandles.SafeProcessHandle.StartCore(ProcessStartInfo startInfo, SafeFileHandle stdinHandle, SafeFileHandle stdoutHandle, SafeFileHandle stderrHandle, SafeHandle[] inheritedHandles, Holder& waitStateHolder) in /_/src/libraries/System.Diagnostics.Process/src/Microsoft/Win32/SafeHandles/SafeProcessHandle.Unix.cs:line 213 at System.Diagnostics.Process.StartCore(ProcessStartInfo startInfo, SafeFileHandle stdinHandle, SafeFileHandle stdoutHandle, SafeFileHandle stderrHandle, SafeHandle[] inheritedHandles) in /_/src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.Unix.cs:line 363 at System.Diagnostics.Process.Start() in /_/src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.cs:line 1272 at System.Diagnostics.Process.Start(ProcessStartInfo startInfo) in /_/src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.cs:line 1383 at Microsoft.Extensions.Internal.ProcessExtensions.RunProcessAndWaitForExit(String fileName, String arguments, TimeSpan timeout, String& stdout) in /_/src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/IntegrationTesting/src/ProcessExtensions.cs:line 93 at Microsoft.Extensions.Internal.ProcessExtensions.GetAllChildIdsUnix(Int32 parentId, ISet1 children, TimeSpan timeout) in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/IntegrationTesting/src/ProcessExtensions.cs:line 44
at Microsoft.Extensions.Internal.ProcessExtensions.KillTree(Process process, TimeSpan timeout) in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/IntegrationTesting/src/ProcessExtensions.cs:line 33
at Microsoft.Extensions.Internal.ProcessExtensions.KillTree(Process process) in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/IntegrationTesting/src/ProcessExtensions.cs:line 17
at Microsoft.Extensions.Hosting.IntegrationTesting.ApplicationDeployer.ShutDownIfAnyHostProcess(Process hostProcess) in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/IntegrationTesting/src/Deployers/ApplicationDeployer.cs:line 126
at Microsoft.Extensions.Hosting.IntegrationTesting.SelfHostDeployer.Dispose() in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/IntegrationTesting/src/Deployers/SelfHostDeployer.cs:line 179
at Microsoft.AspNetCore.Hosting.FunctionalTests.ShutdownTests.ExecuteShutdownTest(String testName, String shutdownMechanic) in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/ShutdownTests.cs:line 107
at Microsoft.AspNetCore.Hosting.FunctionalTests.ShutdownTests.ShutdownTestWaitForShutdown() in //src/libraries/Microsoft.Extensions.Hosting/tests/FunctionalTests/ShutdownTests.cs:line 41
--- End of stack trace from previous location ---

… 180s for stress environments Co-authored-by: rosebyte <14963300+rosebyte@users.noreply.github.com>

Copilot · 2026-06-05T08:15:46Z

@copilot , you only addressed one of my comments, resolve all of them.

Fixed in f9172b4. I've addressed both remaining issues:

KillProcessUnix now uses kill -TERM for graceful termination (SIGTERM) instead of Process.Kill() (SIGKILL)
Test timeouts increased from 60 seconds to 180 seconds (3 minutes) for startup and shutdown waits to handle stress/JIT-stress Helix environments

Copilot

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

rosebyte · 2026-06-11T13:20:19Z

            if (!process.HasExited)
            {
                process.Kill();
+                // Wait for the process to actually exit after Kill() before accessing ExitCode
+                if (!process.WaitForExit(5000))


@copilot, extend the timeout then, something like 30 seconds should be fine as the application is fairly minimal.

svick · 2026-06-05T14:33:44Z

+                var psi = new ProcessStartInfo
+                {
+                    FileName = "kill",
+                    Arguments = $"-TERM {processId}",
+                    RedirectStandardOutput = true,
+                    RedirectStandardError = true,
+                    UseShellExecute = false
+                };


On .Net 11, you could use Process.GetProcessById(processId).SafeHandle.Signal(PosixSignal.SIGTERM). I think this only runs on Unix on .Net 11, so it could make sense to use that instead.

Or you could use the PInvoke approach from ShutdownTests. Both calls to kill should probably use the same approach.

@copilot , this sounds a good idea, implement it.

Implemented in 16bc033. ProcessExtensions.KillProcessUnix now uses libc kill(pid, SIGTERM) (matching the ShutdownTests signal approach), waits for exit, and falls back to Process.Kill() if graceful termination fails.

Co-authored-by: rosebyte <14963300+rosebyte@users.noreply.github.com>

rosebyte

@copilot, I left two comments to implement.

Copilot

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

rosebyte · 2026-06-11T13:20:56Z

+                await started.Task.WaitAsync(TimeSpan.FromSeconds(180));

                SendShutdownSignal(deployer.HostProcess);



@copilot, the change looks good, implement it.

Note
AI-generated.

Fixed in 14a6f4c97. The shutdown test now subscribes before DeployAsync() starts output capture, via SelfHostDeployer.OutputReceived, so the initial Started line can’t be missed.

rosebyte · 2026-06-10T16:40:50Z

@copilot , I left comments for you, please implement them.

Co-authored-by: rosebyte <14963300+rosebyte@users.noreply.github.com>

Copilot · 2026-06-10T17:20:42Z

@copilot , I left comments for you, please implement them.

Fixed in 14a6f4c97. I addressed the remaining shutdown-test startup race by subscribing before DeployAsync() starts output capture and forwarding early process output through SelfHostDeployer, so the test can no longer miss the initial Started line.

mrek-msft · 2026-06-11T09:39:33Z

    internal static class ProcessExtensions
    {
+        private const int ESRCH = 3;
+        private const int SIGTERM = 15;


According to Copilot CLI, it is not guaranteed by POSIX standard that number is always 15.

SIGTERM's value of 15 is not mandated by POSIX itself — POSIX only requires the name to exist. However, every known Unix/Linux implementation uses 15, dating back to early System V and BSD. It's a universal de facto standard at this point

In Process we obtain number at runtime using helper:

runtime/src/libraries/System.Diagnostics.Process/src/System/Diagnostics/Process.Unix.cs

Line 72 in d6db569

int killResult = Interop.Sys.Kill(_processId, Interop.Sys.GetPlatformSignalNumber(PosixSignal.SIGKILL));

Have you considered using something similar here?

@copilot , do we have any workaround?

Co-authored-by: rosebyte <14963300+rosebyte@users.noreply.github.com>

rosebyte · 2026-06-11T13:21:20Z

@copilot , I left two replies, please implement them

Co-authored-by: rosebyte <14963300+rosebyte@users.noreply.github.com>

Copilot · 2026-06-11T14:09:52Z

@copilot , I left two replies, please implement them

Note

AI-generated.

Implemented in 14a6f4c97, fd5da0d51, and d537e794c. The startup observer is wired before output capture begins, Unix signal numbers now come from SystemNative_GetPlatformSignalNumber, and the shutdown exit grace period was extended to 30 seconds before escalation.

Initial plan

a12d2b9

Copilot AI assigned Copilot and rosebyte May 15, 2026

Copilot AI requested review from Copilot and removed request for Copilot May 15, 2026 12:32

Copilot started work on behalf of rosebyte May 15, 2026 12:32 View session

Copilot AI linked an issue May 15, 2026 that may be closed by this pull request

Enable FunctionalTests/TestApp on Extensions Hosting #34090

Open

github-actions Bot added the needs-area-label An area label is needed to ensure this gets routed to the appropriate area owners label May 15, 2026

Re-enable Hosting functional TestApp shutdown tests

6bc1499

Agent-Logs-Url: https://github.com/dotnet/runtime/sessions/f2762648-8aaf-44cd-a0bb-269b2a6b371d Co-authored-by: rosebyte <14963300+rosebyte@users.noreply.github.com>

Copilot AI requested review from Copilot and removed request for Copilot May 15, 2026 13:03

Copilot AI changed the title ~~[WIP] Fix FunctionalTests/TestApp on Extensions Hosting~~ Re-enable Microsoft.Extensions.Hosting FunctionalTests/TestApp shutdown coverage May 15, 2026

Copilot AI requested a review from rosebyte May 15, 2026 13:07

Copilot finished work on behalf of rosebyte May 15, 2026 13:07

github-actions Bot added area-Extensions-Hosting and removed needs-area-label An area label is needed to ensure this gets routed to the appropriate area owners labels May 15, 2026

This was referenced May 16, 2026

The Operation will be canceled. The next steps may not contain expected logs. dotnet/dnceng#3008

Open

browser-wasm linux Release LibraryTests queues timing out #117974

Open

Copilot started work on behalf of rosebyte May 18, 2026 11:32 View session

Fix Hosting shutdown tests on Helix without source tree

b9cd702

Agent-Logs-Url: https://github.com/dotnet/runtime/sessions/e8bb9c1b-1794-4ebc-a563-bec6823fec1c Co-authored-by: rosebyte <14963300+rosebyte@users.noreply.github.com>

Copilot AI requested review from Copilot and removed request for Copilot May 18, 2026 11:55

Copilot AI changed the title ~~Re-enable Microsoft.Extensions.Hosting FunctionalTests/TestApp shutdown coverage~~ Re-enable Microsoft.Extensions.Hosting FunctionalTests/TestApp shutdown coverage across local and Helix environments May 18, 2026

Copilot finished work on behalf of rosebyte May 18, 2026 11:56

Use kill -TERM for graceful termination and increase test timeouts to…

f9172b4

… 180s for stress environments Co-authored-by: rosebyte <14963300+rosebyte@users.noreply.github.com>

Copilot AI requested review from Copilot and removed request for Copilot June 5, 2026 08:15

Copilot finished work on behalf of rosebyte June 5, 2026 08:16

Merge branch 'main' into copilot/enable-functional-tests-on-hosting

5986a65

Copilot AI review requested due to automatic review settings June 5, 2026 12:12

rosebyte marked this pull request as ready for review June 5, 2026 12:12

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Use libc SIGTERM in Hosting test process cleanup

16bc033

Co-authored-by: rosebyte <14963300+rosebyte@users.noreply.github.com>

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DnsGetHostAddresses_LocalhostWithTrailingDot_ReturnsLoopback - SocketException : Name or service not known #128759

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Comment thread ...crosoft.Extensions.Hosting/tests/FunctionalTests/IntegrationTesting/src/ProcessExtensions.cs

Comment thread ...crosoft.Extensions.Hosting/tests/FunctionalTests/IntegrationTesting/src/ProcessExtensions.cs

Merge branch 'main' into copilot/enable-functional-tests-on-hosting

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Fix Hosting shutdown output subscription race

14a6f4c

Co-authored-by: rosebyte <14963300+rosebyte@users.noreply.github.com>

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[android] Android.Device_Emulator.JIT.Test failing on emulators with CoreCLR #112633

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Use runtime signal numbers in hosting shutdown tests

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Co-authored-by: rosebyte <14963300+rosebyte@users.noreply.github.com>

Increase Hosting shutdown exit grace period

d537e79

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[wasm] OpenQA.Selenium.WebDriverTimeoutException: timeout: Timed out receiving message from renderer #117486

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		await started.Task.WaitAsync(TimeSpan.FromSeconds(180));

		SendShutdownSignal(deployer.HostProcess);

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