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[fix] Fix race condition in BlameCollector: skip hang dump when testhost hasn't launched yet #16065

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[fix] Fix race condition in BlameCollector: skip hang dump when testhost hasn't launched yet #16065

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19e7dff
Fix race condition: skip hang dump when testhost hasn't launched yet
nohwnd May 25, 2026
16a2275
fix: mark _testHostProcessId as volatile for cross-thread visibility
nohwnd May 25, 2026
7180aef
fix: start hang-dump timer only after testhost launches
nohwnd May 26, 2026
c74e1d0
test: add integration test for hang dump when testhost fails to start
nohwnd May 26, 2026
6e1864e
fix: restore runtimeconfig.json after integration test
nohwnd May 26, 2026
b179a7d
Use Interlocked.Exchange to set _testHostProcessId
nohwnd May 28, 2026
a30e0c2
test: use regex for version replacement, add DoNotParallelize, assert…
nohwnd May 29, 2026
5895ebd
test: use StdErrorRegexIsMatch for runtime-not-found assertion
nohwnd May 31, 2026
ecb07c8
test: check both stdout and stderr for runtime-not-found assertion
nohwnd Jun 1, 2026
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11 changes: 8 additions & 3 deletions src/Microsoft.TestPlatform.Extensions.BlameDataCollector/BlameCollector.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -200,7 +200,8 @@ public override void Initialize(
if (_collectProcessDumpOnHang)
{
_inactivityTimer ??= new InactivityTimer(CollectDumpAndAbortTesthost);
ResetInactivityTimer();
// Don't start the timer here — wait until TestHostLaunched so we know
// which process to dump. ResetInactivityTimer is called from TestHostLaunchedHandler.
}
Comment on lines 200 to 205
Comment on lines 200 to 205
Comment on lines +203 to 205
}

Expand Down Expand Up @@ -244,6 +245,10 @@ private void CollectDumpAndAbortTesthost()
EqtTrace.Verbose("Inactivity timer is already disposed.");
}

// If testhost has not launched yet, the timer should not have been started,
// so this callback should not fire. Assert to catch unexpected paths.
TPDebug.Assert(_testHostProcessId != 0, "CollectDumpAndAbortTesthost called but testhost has not launched yet.");

Comment on lines +248 to +251
Comment on lines +248 to +251
if (_collectProcessDumpOnCrash)
{
// Detach the dumper from the testhost process to prevent crashing testhost process. When the dumper is procdump.exe
Expand Down Expand Up @@ -630,9 +635,9 @@ private void SessionEndedHandler(object? sender, SessionEndEventArgs args)
/// <param name="args">TestHostLaunchedEventArgs</param>
private void TestHostLaunchedHandler(object? sender, TestHostLaunchedEventArgs args)
{
ResetInactivityTimer();
_testHostProcessId = args.TestHostProcessId;
Interlocked.Exchange(ref _testHostProcessId, args.TestHostProcessId);
_testHostProcessName = _processHelper.GetProcessName(args.TestHostProcessId);
ResetInactivityTimer();

if (!_collectProcessDumpOnCrash)
{
Expand Down
2 changes: 1 addition & 1 deletion src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Resources/xlf/Resources.cs.xlf
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@@ -1,4 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" original="../Resources.resx" target-language="cs">
<body>
Expand Down
2 changes: 1 addition & 1 deletion src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Resources/xlf/Resources.de.xlf
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@@ -1,4 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" original="../Resources.resx" target-language="de">
<body>
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2 changes: 1 addition & 1 deletion src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Resources/xlf/Resources.es.xlf
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@@ -1,4 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" original="../Resources.resx" target-language="es">
<body>
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2 changes: 1 addition & 1 deletion src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Resources/xlf/Resources.fr.xlf
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@@ -1,4 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" original="../Resources.resx" target-language="fr">
<body>
Expand Down
2 changes: 1 addition & 1 deletion src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Resources/xlf/Resources.it.xlf
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@@ -1,4 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" original="../Resources.resx" target-language="it">
<body>
Expand Down
2 changes: 1 addition & 1 deletion src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Resources/xlf/Resources.ja.xlf
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@@ -1,4 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" original="../Resources.resx" target-language="ja">
<body>
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2 changes: 1 addition & 1 deletion src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Resources/xlf/Resources.ko.xlf
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@@ -1,4 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" original="../Resources.resx" target-language="ko">
<body>
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2 changes: 1 addition & 1 deletion src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Resources/xlf/Resources.pl.xlf
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@@ -1,4 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" original="../Resources.resx" target-language="pl">
<body>
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2 changes: 1 addition & 1 deletion src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Resources/xlf/Resources.pt-BR.xlf
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@@ -1,4 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" original="../Resources.resx" target-language="pt-BR">
<body>
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2 changes: 1 addition & 1 deletion src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Resources/xlf/Resources.ru.xlf
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@@ -1,4 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" original="../Resources.resx" target-language="ru">
<body>
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2 changes: 1 addition & 1 deletion src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Resources/xlf/Resources.tr.xlf
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@@ -1,4 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" original="../Resources.resx" target-language="tr">
<body>
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2 changes: 1 addition & 1 deletion src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Resources/xlf/Resources.zh-Hans.xlf
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@@ -1,4 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" original="../Resources.resx" target-language="zh-Hans">
<body>
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2 changes: 1 addition & 1 deletion src/Microsoft.TestPlatform.Extensions.BlameDataCollector/Resources/xlf/Resources.zh-Hant.xlf
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@@ -1,4 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.2" xsi:schemaLocation="urn:oasis:names:tc:xliff:document:1.2 xliff-core-1.2-transitional.xsd">
<file datatype="xml" source-language="en" original="../Resources.resx" target-language="zh-Hant">
<body>
Expand Down
40 changes: 40 additions & 0 deletions test/Microsoft.TestPlatform.Acceptance.IntegrationTests/BlameDataCollectorTests.cs
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Expand Up @@ -238,6 +238,46 @@ public void HangDumpChildProcesses(RunnerInfo runnerInfo)
ValidateDump(2);
}

[TestMethod]
[DoNotParallelize] // Modifies the test asset's runtimeconfig.json on disk.
[NetCoreTargetFrameworkDataSource]
public void HangDumpShouldNotHangWhenTestHostFailsToStart(RunnerInfo runnerInfo)
Comment on lines +241 to +244
{
// When testhost can't start (e.g. wrong runtime version), the inactivity timer
// must not try to dump PID 0. It should exit cleanly because the timer only starts
// after TestHostLaunched, which never fires here.
SetTestEnvironment(_testEnvironment, runnerInfo);
const string testAssetProjectName = "SimpleTestProjectMessedUpTargetFramework";
var assemblyPath = GetTestDllForFramework(testAssetProjectName + ".dll", Core11TargetFramework);

// Make testhost fail immediately by targeting a non-existent runtime.
var runtimeConfigJson = Path.Combine(Path.GetDirectoryName(assemblyPath)!, testAssetProjectName + ".runtimeconfig.json");
var originalContent = File.ReadAllText(runtimeConfigJson);
try
{
var updatedContent = Regex.Replace(originalContent, @"""version""\s*:\s*""[\d.]+""", @"""version"": ""9999.0.0""");
File.WriteAllText(runtimeConfigJson, updatedContent);

Comment on lines +258 to +260
var arguments = PrepareArguments(assemblyPath, GetTestAdapterPath(), string.Empty, string.Empty, runnerInfo.InIsolationValue);
arguments = string.Concat(arguments, $" /ResultsDirectory:{TempDirectory.Path}");
arguments = string.Concat(arguments, $@" /Blame:""CollectHangDump;HangDumpType=mini;TestTimeout=30s""");
InvokeVsTest(arguments);

// vstest should exit with failure (testhost didn't start), but not hang and not crash.
ExitCodeEquals(1);
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@nohwnd nohwnd May 29, 2026

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try ensuring harder the crash was because we did not find the runtime.

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Done — added Assert.MatchesRegex after ExitCodeEquals(1) that checks the combined stdout+stderr for the runtime-not-found message (matches "framework.*9999.0.0", "9999.0.0.*not found", or "compatible framework version"). This verifies the failure was specifically due to the missing runtime, not some other error.

🔧 Iterated by PR Iteration Agent 🔧

// Verify the failure was specifically because the runtime wasn't found, not some other error.
// The .NET runtime error can appear in stderr or stdout depending on the platform/host.
Assert.IsTrue(
Regex.IsMatch(StdErr, "9999\\.0\\.0") || Regex.IsMatch(StdOut, "9999\\.0\\.0"),
$"Expected '9999.0.0' in output.\nStdErr: {StdErr}\nStdOut: {StdOut}");
Assert.DoesNotContain(".dmp", StdOut, "no dump should be collected when testhost never launched");
}
finally
{
File.WriteAllText(runtimeConfigJson, originalContent);
}
}
Comment on lines +243 to +279

[TestMethod]
[TestCategory("Windows-Review")]
[DoNotParallelize] // Installs/uninstalls procdump as machine-wide postmortem debugger via HKLM registry.
Expand Down
66 changes: 57 additions & 9 deletions test/Microsoft.TestPlatform.Extensions.BlameDataCollector.UnitTests/BlameCollectorTests.cs
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Expand Up @@ -111,7 +111,7 @@ public void InitializeWithDumpForHangDisabledShouldNotInitializeInactivityTimerO

/// <summary>
/// Initializing with collect dump for hang should configure the timer with the right values and should
/// not call the reset method if no events are received.
/// start the timer when testhost launches (not during Initialize).
/// </summary>
[TestMethod]
public void InitializeWithDumpForHangShouldInitializeInactivityTimerAndCallResetOnce()
Expand All @@ -127,12 +127,17 @@ public void InitializeWithDumpForHangShouldInitializeInactivityTimerAndCallReset
_mockLogger.Object,
_context);

Assert.AreEqual(1, resetCalledCount, "Should have called InactivityTimer.Reset exactly once since no events were received");
Assert.AreEqual(0, resetCalledCount, "Should not have called InactivityTimer.Reset during Initialize — timer starts on TestHostLaunched");

// Simulate testhost launching — this should start the timer.
_mockDataColectionEvents.Raise(x => x.TestHostLaunched += null, new TestHostLaunchedEventArgs(_dataCollectionContext, 1234));

Assert.AreEqual(1, resetCalledCount, "Should have called InactivityTimer.Reset exactly once after TestHostLaunched");
}

/// <summary>
/// Initializing with collect dump for hang should configure the timer with the right values and should
/// reset for each event received
/// reset for each event received (including TestHostLaunched which starts the timer).
/// </summary>
[TestMethod]
public void InitializeWithDumpForHangShouldInitializeInactivityTimerAndResetForEachEventReceived()
Expand All @@ -151,6 +156,9 @@ public void InitializeWithDumpForHangShouldInitializeInactivityTimerAndResetForE
_mockLogger.Object,
_context);

// Simulate testhost launching — this starts the timer (1st reset).
_mockDataColectionEvents.Raise(x => x.TestHostLaunched += null, new TestHostLaunchedEventArgs(_dataCollectionContext, 1234));

TestCase testcase = new("TestProject.UnitTest.TestMethod", new Uri("test:/abc"), "abc.dll");

_mockDataColectionEvents.Raise(x => x.TestCaseStart += null, new TestCaseStartEventArgs(testcase));
Expand Down Expand Up @@ -182,13 +190,16 @@ public void InitializeWithDumpForHangShouldCaptureADumpOnTimeout()
_mockDataCollectionSink.Setup(x => x.SendFileAsync(It.IsAny<FileTransferInformation>())).Callback(() => hangBasedDumpcollected.Set());

_blameDataCollector.Initialize(
GetDumpConfigurationElement(false, false, true, 0),
GetDumpConfigurationElement(false, false, true, 50),
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@nohwnd nohwnd May 26, 2026

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Moot — with the timer starting only after TestHostLaunched, there's no race between the timer and the PID assignment. The 50ms timeout is fine.

_mockDataColectionEvents.Object,
_mockDataCollectionSink.Object,
_mockLogger.Object,
_context);

hangBasedDumpcollected.Wait(1000, TestContext.CancellationToken);
// Simulate testhost launching before the timer fires.
_mockDataColectionEvents.Raise(x => x.TestHostLaunched += null, new TestHostLaunchedEventArgs(_dataCollectionContext, 1234));

hangBasedDumpcollected.Wait(2000, TestContext.CancellationToken);
_mockProcessDumpUtility.Verify(x => x.StartHangBasedProcessDump(It.IsAny<int>(), It.IsAny<string>(), It.IsAny<bool>(), It.IsAny<string>(), It.IsAny<Action<string>>()), Times.Once);
_mockProcessDumpUtility.Verify(x => x.GetDumpFiles(true, It.IsAny<bool>()), Times.Once);
_mockDataCollectionSink.Verify(x => x.SendFileAsync(It.Is<FileTransferInformation>(y => y.Path == dumpFile)), Times.Once);
Expand Down Expand Up @@ -216,13 +227,16 @@ public void InitializeWithDumpForHangShouldCaptureKillTestHostOnTimeoutEvenIfGet
_mockProcessDumpUtility.Setup(x => x.GetDumpFiles(true, It.IsAny<bool>())).Callback(() => hangBasedDumpcollected.Set()).Throws(new Exception("Some exception"));

_blameDataCollector.Initialize(
GetDumpConfigurationElement(false, false, true, 0),
GetDumpConfigurationElement(false, false, true, 50),
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Same as above — no race with the new approach.

_mockDataColectionEvents.Object,
_mockDataCollectionSink.Object,
_mockLogger.Object,
_context);

hangBasedDumpcollected.Wait(1000, TestContext.CancellationToken);
// Simulate testhost launching before the timer fires.
_mockDataColectionEvents.Raise(x => x.TestHostLaunched += null, new TestHostLaunchedEventArgs(_dataCollectionContext, 1234));

hangBasedDumpcollected.Wait(2000, TestContext.CancellationToken);
_mockProcessDumpUtility.Verify(x => x.StartHangBasedProcessDump(It.IsAny<int>(), It.IsAny<string>(), It.IsAny<bool>(), It.IsAny<string>(), It.IsAny<Action<string>>()), Times.Once);
_mockProcessDumpUtility.Verify(x => x.GetDumpFiles(true, It.IsAny<bool>()), Times.Once);
}
Expand Down Expand Up @@ -251,18 +265,52 @@ public void InitializeWithDumpForHangShouldCaptureKillTestHostOnTimeoutEvenIfAtt
_mockDataCollectionSink.Setup(x => x.SendFileAsync(It.IsAny<FileTransferInformation>())).Callback(() => hangBasedDumpcollected.Set()).Throws(new Exception("Some other exception"));

_blameDataCollector.Initialize(
GetDumpConfigurationElement(false, false, true, 0),
GetDumpConfigurationElement(false, false, true, 50),
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Same as above — no race with the new approach.

_mockDataColectionEvents.Object,
_mockDataCollectionSink.Object,
_mockLogger.Object,
_context);

hangBasedDumpcollected.Wait(1000, TestContext.CancellationToken);
// Simulate testhost launching before the timer fires.
_mockDataColectionEvents.Raise(x => x.TestHostLaunched += null, new TestHostLaunchedEventArgs(_dataCollectionContext, 1234));

hangBasedDumpcollected.Wait(2000, TestContext.CancellationToken);
_mockProcessDumpUtility.Verify(x => x.StartHangBasedProcessDump(It.IsAny<int>(), It.IsAny<string>(), It.IsAny<bool>(), It.IsAny<string>(), It.IsAny<Action<string>>()), Times.Once);
_mockProcessDumpUtility.Verify(x => x.GetDumpFiles(true, It.IsAny<bool>()), Times.Once);
_mockDataCollectionSink.Verify(x => x.SendFileAsync(It.Is<FileTransferInformation>(y => y.Path == dumpFile)), Times.Once);
}

/// <summary>
/// If testhost has not launched, the inactivity timer should not be started, so no hang dump
/// should be attempted even after the configured timeout elapses.
/// </summary>
[TestMethod]
public void InitializeWithDumpForHangShouldNotStartTimerIfTestHostHasNotLaunchedYet()
{
_blameDataCollector = new TestableBlameCollector(
_mockBlameReaderWriter.Object,
_mockProcessDumpUtility.Object,
null,
_mockFileHelper.Object,
_mockProcessHelper.Object);

_blameDataCollector.Initialize(
GetDumpConfigurationElement(false, false, true, 0),
_mockDataColectionEvents.Object,
_mockDataCollectionSink.Object,
_mockLogger.Object,
_context);

// Do NOT raise TestHostLaunched — timer should never start.
// Wait long enough that a started timer with timeout 0 would have fired.
Thread.Sleep(100);
Comment on lines +304 to +306

// The hang dump must not have been attempted.
_mockProcessDumpUtility.Verify(
x => x.StartHangBasedProcessDump(It.IsAny<int>(), It.IsAny<string>(), It.IsAny<bool>(), It.IsAny<string>(), It.IsAny<Action<string>>()),
Times.Never);
}

/// <summary>
/// The trigger session ended handler should write to file if test start count is greater.
/// </summary>
Expand Down
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