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[6.1.9 Cherry-pick] Fix managed SNI MARS receive teardown race - #4949
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cheenamalhotra
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To resolve, run: git cherry-pick 266a32e
* Fix managed SNI MARS receive teardown race Handle disposed TCP and named-pipe streams through SNI errors and preserve MARS packet ownership during receive re-arm failure. Add deterministic and SQL-backed regression coverage for #4679. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> * Fix MARS teardown callbacks and regression test hangs Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> * Address MARS teardown review feedback Keep consumed-packet cleanup outside the receive lock, add a lock-scope regression, and remove redundant manual-test collection isolation. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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paulmedynski
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🟡 Changes recommended
The SNI guard incorrectly skips all eight regression cases on Linux/macOS under the default configuration, leaving the Unix managed-SNI path untested even when prerequisites are met.
1 open issue
What changed in this PR
Backports the managed SNI MARS receive teardown fix to release/6.1 for 6.1.9, addressing unobserved receive-continuation exceptions without changing public APIs.
Changes:
- Handle disposed TCP and named-pipe streams through existing SNI error paths.
- Preserve packet ownership during receive failures and notify only sessions with pending async reads.
- Adjust teardown assertions and add deterministic unit coverage plus a SQL-backed regression test. Live SQL scenarios were not executed locally.
| File | Description |
|---|---|
src/Microsoft.Data.SqlClient/tests/UnitTests/Microsoft/Data/SqlClient/ManagedSni/SniReceiveTests.cs |
Adds transport teardown, callback, and packet-ownership tests. |
src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/AsyncTest/MarsReceiveTeardownTest.cs |
Adds SQL-backed MARS teardown regression scenarios. |
src/Microsoft.Data.SqlClient/tests/ManualTests/Microsoft.Data.SqlClient.ManualTesting.Tests.csproj |
Includes the new manual regression test. |
src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/Parser/TdsParserStateObject.cs |
Allows invalidated buffered-data estimates after closure in debug assertions. |
src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/SniTcpHandle.netcore.cs |
Reports disposed TCP streams through SNI errors. |
src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/SniNpHandle.netcore.cs |
Guards named-pipe receives against disposed streams. |
src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/SniMarsHandle.netcore.cs |
Limits error callbacks to pending async receives. |
src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/SniMarsConnection.netcore.cs |
Preserves error packets and releases incomplete payloads. |
src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/Parser/TdsParserStateObject.netcore.cs |
Allows valid late MARS error callbacks in debug assertions. |
Review effort: Balanced
| public static bool CanRun() | ||
| { | ||
| if (!DataTestUtility.AreConnStringsSetup() || | ||
| !DataTestUtility.IsNotAzureServer() || !DataTestUtility.IsUsingManagedSNI()) |
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Description
Backports #4680 (266a32e) to
release/6.1for 6.1.9. The failed cherry-pick is now resolved.Prevents unobserved receive-continuation exceptions during managed SNI MARS teardown by handling disposed transport streams, preserving packet ownership during receive re-arm failures, and notifying only sessions with pending async reads.
Release-specific adaptations retain the existing split parser layout, update the async callback assertion in its .NET-specific partial file, use the release branch's SNI error and timeout helpers, and explicitly include the SQL regression in the manual-test project. A test-local prerequisite check replaces the newer shared sysadmin helper.
No public API or intended compatibility changes.
Issues
Backport of #4680 for #4679.
Testing
Using a session-local .NET SDK 9.0.312, with the restored x64 native SNI DLL copied into generated test outputs:
Passed: 58, failed: 0, including all 25 backported teardown cases.
Build passed; regression theory discovered and skipped because its SQL Server/managed-SNI/sysadmin prerequisites were not configured. Live SQL integration scenarios were not executed. NuGet auditing was disabled only for local validation because the NuGet.org vulnerability service was unreachable; repository settings are unchanged.
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Tests added or updated
Public API changes documented (none)
Verified against customer repro (not available locally)
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