Root Cause Analysis

TL;DR: Flaky multi_attach_concurrency_test1 in socket_tests.exe — same known flaky test seen in other merge queue runs. Not caused by the PR under test (#5070).

What happened

Merge queue run 22966096347 for PR #5070 (Install procdump using curl instead of chocolatey) had the following outcomes:

Job	Conclusion
`driver_tests (server23h2) / run_test (Release)`	Failed ← triggered issue creation
`driver_tests (server23h2) / run_test (Debug)`	Cancelled (external)
`driver_tests (server2025) / run_test (Debug)`	Cancelled (external)
`driver_tests (server2025) / run_test (Release)`	Cancelled (external)
`driver_tests (server2022) / run_test (Debug)`	Cancelled (external)
All other jobs (24)	Passed

Failure detail

socket_tests.exe on server23h2/Release:

test cases: 62 | 61 passed | 1 failed assertions: 11572 | 11571 passed | 1 failed

The failing test is multi_attach_concurrency_test1 — a 60-second stress test running 7 threads doing concurrent attach/detach, invoke_connection, and allow_block operations on cgroup_sock_addr2.o. Only 1 out of 11,572 assertions failed, indicating a timing-dependent race condition.

This is the same flaky test that failed on server2022/NativeOnlyRelease in PR #5072's CI (#5072 comment).

Why this is not a regression

PR Install procdump using curl instead of chocolately #5070 only changes CI infrastructure (switches procdump installation from Chocolatey to curl) — no product code or test code was modified
The test passed on 3 other platform/config combinations in this same run
The 4 cancelled jobs were mid-test with all tests passing when they were externally cancelled (merge queue reset)
PR Install procdump using curl instead of chocolately #5070 successfully merged later that day (20:19 UTC) via a subsequent merge queue run

Recommendation

This issue can be closed as a false positive. The flaky multi_attach_concurrency_test1 should be tracked separately if it recurs frequently enough to warrant investigation.

Workflow failed - driver_server23h2 #5096

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