Quarantine Re-quarantine Http3RequestTests.GET_GracefulServerShutdown_RequestCompleteSuccessfullyInsideHostTimeout

[github-actions]

Test was unquarantined in #66083 on 2026-04-02 (original issue #35070) but has failed 2 times since.

Failing Test(s)

Interop.FunctionalTests.Http3.Http3RequestTests.GET_GracefulServerShutdown_RequestCompleteSuccessfullyInsideHostTimeout

Error Message

Assert.DoesNotContain() Failure: Filter matched in collection
Collection: [..., Debug Microsoft.AspNetCore.Server.Kestrel.Http3: Trace id "0HNKH45G1RMEK:00000000": HTTP/3 stream error "H3_NO_ERROR". An abort is being sent to the stream., Debug Microsoft.AspNetCore.Server.Kestrel.Transport.Quic: Connection id "0HNKH45G1RMEK" aborted by application with error code 256 because: "The client closed the connection."., Debug Microsoft.AspNetCore.Server.Kestrel.Connections: Some connections failed to close gracefully during server shutdown., Debug Microsoft.AspNetCore.Server.Kestrel.Connections: Some connections failed to abort during server shutdown., Debug Microsoft.Extensions.Hosting.Internal.Host: Hosting stopped]

Stacktrace

Details

at Interop.FunctionalTests.Http3.Http3RequestTests.GET_GracefulServerShutdown_RequestCompleteSuccessfullyInsideHostTimeout(HttpProtocols protocol)
  in /_/src/Servers/Kestrel/test/Interop.FunctionalTests/Http3/Http3RequestTests.cs:line 2323

Logs

Details

[0.000s] TestLifetime Information: Starting test GET_GracefulServerShutdown_RequestCompleteSuccessfullyInsideHostTimeout-Http3
[0.046s] Now listening on: (127.0.0.1/redacted)
[0.089s] QUIC connection accepted
[0.101s] Stream id "0HNKH45G1RMEK:00000000" type Bidirectional accepted
[...]
Some connections failed to close gracefully during server shutdown.
Some connections failed to abort during server shutdown.

Build

https://dev.azure.com/dnceng-public/public/_build/results?buildId=1364909

Note

🔒 Integrity filter blocked 12 items

The following items were blocked because they don't meet the GitHub integrity level.

• #65815 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65817 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65827 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65816 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #66130 issue_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #66135 issue_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #40626 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #46028 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #49286 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #54846 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #55092 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #55707 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

Generated by Daily Test Quarantine Management · ● 25.1M · ◷

[github-actions]

Investigation

This test was unquarantined on 2026-04-02 via PR #66083 (issue #35070) after passing 100% for 30+ days. It failed again in builds 1364909 and 1363509 within 2 days.

Failure pattern: The test asserts that no connections fail to close/abort gracefully during HTTP server shutdown. The failure message indicates some QUIC connections are not being properly terminated within the shutdown timeout.

Why HTTP/3 but not HTTP/2: The HTTP/2 variant passes (121ms) while only the HTTP/3 (QUIC/MsQuic) variant fails. This points to QUIC-specific behavior in the graceful shutdown path. QUIC connections have more complex teardown requirements than TCP.

Likely root cause: A race condition in the QUIC connection lifecycle during server shutdown where connections may not have completed their QUIC handshake before the server initiates shutdown, or where QUIC streams are not properly drained. The SomeConnectionsFailedToCloseAbortGracefullyDuringServerShutdown message is generated by the underlying Kestrel shutdown logic.

Recommendation: Review Http3Connection.ShutdownAsync() and the interaction with MsQuicConnection.ShutdownAsync() to ensure QUIC connections are fully drained before the shutdown timeout fires. This may require a longer timeout in the test or improved shutdown signaling in the QUIC transport layer.

Note

🔒 Integrity filter blocked 12 items

The following items were blocked because they don't meet the GitHub integrity level.

• #65815 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65817 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65827 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65816 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #66130 issue_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #66135 issue_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #40626 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #46028 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #49286 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #54846 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #55092 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #55707 list_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

Generated by Daily Test Quarantine Management · ● 25.1M · ◷