[Test][RL] Add sleep/wake E2E suite with MRV1/MRV2 runner matrix

[RuiningWANG]

Purpose

Add end-to-end guard tests for the vLLM sleep-mode lifecycle (POST /sleep, POST /wake_up, GET /is_sleeping), rebuilt on top of the (now closed) #45586 draft — its pause/resume portion already landed via #52144; this PR revives the sleep/wake portion.

• 27 single-dimension tests, each running on both MRV1 and MRV2 (54 collected instances) via an explicit VLLM_USE_V2_MODEL_RUNNER parametrized fixture — both values are set explicitly because recent vLLM defaults to MRV2, so an unset variable would silently run both rounds on MRV2
• three fixture tiers (class-scoped shared / function-scoped isolated / seeded) keep exactly one server alive at any moment: 32 starts serve 54 instances
• mechanism-layer thresholds centralized in _THRESHOLDS with a first-run MRV2 triage policy (contract-layer failure = bug; mechanism-layer failure = baseline comparison first, split per runner only for proven-legitimate shifts)
• includes the [Bugfix] Fix illegal memory access from a forward during a partial wake_up #44483 partial-wake scheduler regression test: the scheduler must hold requests between wake_up(["weights"]) and wake_up(["kv_cache"]) instead of dispatching FlashAttention on the unmapped kv_cache VA

Per-dimension breakdown:

Dimension	Class	Tests
state flags + vllm:engine_sleep_state metrics	TestSleepWakeFlags	5
physical GPU bytes freed/re-allocated per level	TestPhysicalMemory	4
scheduler gate during partial wake	TestSchedulerGate	3
golden output after full/staged wake + cycles	TestOutputCorrectness	4
protocol misuse tolerance	TestErrorPaths	3
concurrent generate vs sleep/wake liveness	TestConcurrentRace	1
GPU memory stability across 10 cycles	TestMemoryLeakCycle	1
n>1 in-flight abort drains cleanly	TestAbortDuringParallelSampling	1
logprobs drift < 1e-2	TestLogprobsPrecision	1
latency bounds (full/staged/cycles)	TestSleepWakeLatency	3
5 staged cycles output stability	TestStagedWakeCycles	1

Resolves (test coverage for) the regression introduced by #44483. RFC: #45585.

Test Plan

# Requires a GPU; default model Qwen/Qwen3-0.6B (override via VLLM_TEST_MODEL)
pytest tests/entrypoints/serve/dev/rlhf/test_sleep_wake.py -v

# Single runner round
pytest tests/entrypoints/serve/dev/rlhf/test_sleep_wake.py -v -k MRV1
pytest tests/entrypoints/serve/dev/rlhf/test_sleep_wake.py -v -k MRV2

Test Result

---

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• The test plan, such as providing test command.
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[claude]

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[Ronald1995]

Implemented the consolidation described in RFC #55421 (follow-up to #45585) and pushed ca9d05b0e7e75c8637b517155e9b65307bea1389 to this PR branch.

• Move the HTTP sleep suite to rlhf/state_transitions/test_sleep_wake.py and remove the duplicate serve/dev/test_sleep.py.
• Cover MRV1 eager, MRV2 eager, and MRV2 graph execution. Check flags/metrics, idempotency, both partial-wake orders, and the same accepted request completing after wake.
• Use /load to observe server acceptance before asserting request gating. Level-2 recovery reloads the checkpoint before generation; repeated level-1 cycles check cache invalidation and restored output/logprobs.
• Add tests/v1/engine/test_engine_core_sleep.py for drain-before-offload, failure propagation, level-0 behavior, and partial-wake scheduling. It tests production EngineCore methods with mocked boundaries, without allocating a model.
• Allocator, offline reload, LoRA, hybrid-model and distributed regressions stay in their existing component suites. The existing entrypoints and engine jobs retain execution ownership.

Shared harness and docstring ownership changes are coordinated across #54930, #53541, #51350, #52864 and #52902. The merged pause/resume suite also gets bounded client-thread waits and preserved request exceptions. Product metrics are split into draft #55781.

Validation: final PR files passed Ruff 0.14.0, AST/YAML/diff checks and applicable pre-commit hooks including mypy. The Dockerfile-graph script was run separately with Git Bash on Windows. All six branches were also combined locally without conflicts, with the two/four/four-GPU job assignments checked. Checker + metrics pure-module tests passed together: 11 passed, using source-loaded modules to bypass unavailable Windows package initialization.

Not validated: normal vLLM package collection is blocked locally by missing uvloop; no GPU or model-evaluation runs were performed. The newly configured Linux/GPU lanes still need to run before merge. Routing replay and backend/model expansion remain separate coverage gaps, not claimed by these tests.

AI assistance was used; human review and Linux/GPU validation of the final diff remain required.

[Ronald1995]

Scope correction pushed in 66b65d3596370c86e6f6d9a39220702065ec9e03.

The earlier mainline synchronization accidentally included unrelated changes from a local tracking reference that did not match the PR's actual upstream base. Those changes have now been removed from the final PR diff:

• tests/kernels/moe/test_b12x.py
• tests/models/test_initialization.py
• tests/v1/kv_connector/unit/test_mooncake_store_scheduler.py
• vllm/distributed/kv_transfer/kv_connector/v1/mooncake/store/scheduler.py
• vllm/model_executor/layers/fused_moe/oracle/mxfp4.py

I verified the five files against the immutable upstream merge-base 6fbb00b18874e27ba7d7adc0a3b8e93fee763ab1 and then checked GitHub's actual head SHA and Files changed list after pushing: this PR now contains exactly 7 intended files. The RL changes themselves are unchanged. This correction uses an additive cleanup commit; it does not rewrite contributor history.

This corrects the earlier scope-validation claim. No new GPU execution results are claimed.

[Ronald1995]

Updated the shared-server lifecycle while preserving the existing server reuse.

• Added reusable_server, which defers parent-process distributed/memory cleanup until RemoteOpenAIServer has terminated its process group and completed its GPU-memory release check.
• Marked the module-scoped pause/resume and sleep/wake suites to skip the normal function-scoped global cleanup while their shared server is still alive.
• Kept the sleep/wake fixture module-scoped: the three MRV1/MRV2 eager/graph configurations still start exactly three servers rather than one server per test item.

Validation: targeted ruff check and ruff format --check passed. Full collection was unavailable locally because the test environment is missing tblib.

[mergify]

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @RuiningWANG.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork