[https://nvbugs/6621362][fix] Unblock Python disagg transfers stalled by a context-side timeout by bo-nv · Pull Request #20459 · NVIDIA/TensorRT-LLM

bo-nv · 2026-10-16T05:24:09Z

Description

Fixes https://nvbugs/6621362: disaggregated/test_disaggregated.py::test_disaggregated_stress_test[input8k-output1k-conc512-qwen3_5_4b_fp8_stress] fails on H100 with an aiperf error rate of 75-100% (HTTP 500s). The generation worker ends up permanently deadlocked: num_scheduled_requests = 0, request fetch frozen, part of its KV cache still held, and every later request times out at the router.

Root cause

Three defects on the Python V2 transceiver route (transceiver_runtime auto → PYTHON for Qwen3.5) combine whenever the generation worker is the bottleneck, i.e. its request queue makes a peer wait longer than kv_transfer_timeout_ms (60 s) before it asks for the KV:

The context-side transfer clock counts the peer's queueing delay. It starts when the send is posted, but nothing is written until the generation peer sends REQUEST_DATA. With generation max_batch_size below the offered concurrency, that request waits in the generation queue, the context send expires before the peer ever asks, and the TxSession is cancelled and cleared.
A late REQUEST_DATA is never answered. Sender._respond_with_kv treats a REQUEST_DATA for a session that is not registered as an early generation-first request and parks it. For a session that was already cleared, nothing ever replies, so the peer's receive task stays TRANSFERRING forever and pins its KV pages and batch slot.
An idle generation worker never acts on its own receive timeout. Without in-flight cancellation, a timed-out generation receive is cancelled only in _handle_responses, which runs only after a forward step. Once every generation slot holds a receive that defect 2 left unanswered, nothing is scheduled and the worker stops admitting requests for good.

Fix

Answer late REQUEST_DATA (defect 2). Sender (native/transfer.py) remembers cleared TxSession ids for a while (_RETIRED_SESSION_TTL_S, expired oldest first) and answers a REQUEST_DATA for one of them FAILED. It matches on the peer's sender_req_id too, so a retried generation request whose session is gone is answered as well. A retry (fresh unique_rid) whose context session is still live is also answered FAILED rather than parked: serving it would need every reply keyed by the receiver's id and could write the same pieces to two attempts. Early generation-first REQUEST_DATA is still parked as before. A parked REQUEST_DATA that no session takes within _STALE_REQ_INFO_TTL_S (120 s) used to be dropped silently by the stale sweep; without attention DP on the context side it is now answered FAILED as well, so a peer asking after the cleared-session markers expired, or a generation-first request whose context never came, does not hang. Under context attention DP, generation-first requests are broadcast to every DP group and the non-assigned groups' entries are expected, so they are still dropped silently: a FAILED from them would fail a receive the assigned ranks are writing. The sender never wrote anything for such a session, and its FAILED result frame ends the receive through the normal error reap, exactly like any other sender-reported transfer failure, so defect 3 no longer leaves a slot stuck.
Keep a failed receive until every writer has reported. Without physical ownership (the default), a generation receive used to fail and be retired on the first writer's FAILED. With several context ranks writing one receive, that FAILED (including the new reply for a cleared session) can arrive while a sibling rank is still writing, and retiring the receive then hands pages it is writing to another request. RxSession.failed_receive_awaits_writers() now holds a failed receive while any KV task still waits for a writer's terminal result; wait_complete and the transceiver's retirement checks (_retirement_blocked, also in the TP consensus) honor it. The hold also survives a cancel that comes after the failure (a client abort, the generation-side timeout, or a peer's CANCEL_SESSION): it keys on the session's first logical outcome, and has_transferring_tasks() reports it, so cancel_request() refuses to free the receive, as it did before this change when such a receive stayed TRANSFERRING. A receive cancelled before it failed keeps its existing behavior. A live writer ends with a result or a CANCEL_SESSION, at the latest at its own context-side transfer deadline, so the hold is bounded at 2x kv_transfer_timeout_ms from when it starts: a writer still silent then is presumed gone (e.g. its process died) and the receive is retired with a warning, instead of pinning its pages and slot on a worker that never acts on its own receive timeout (the PP executor loop, or an idle one). Cancellation and shutdown keep their existing behavior.
Do not charge the peer's queueing to the transfer (defect 1). A context send is exempt from its transfer timeout while its session is live and not every peer rank has asked yet, and once they all have, the transfer is timed from that moment. Two new KvCacheTransceiver hooks carry this: context_transfer_is_waiting_for_peer and context_transfer_peer_ready_time. Both default to "unknown", so the C++ runtime is unchanged. KvCacheTransceiverV2 implements them from the send session's receiver_ready and the time it was set (peer_ready_time), not from its status: with several receiver ranks the first rank's writes make the session TRANSFERRING while other ranks are still queued. The executor reads both fields without the session lock, so the sender stores peer_ready_time before receiver_ready. The wait is bounded at 3x kv_transfer_timeout_ms from the send, so a send whose peer never asks is still reclaimed, and a retired, cancelled or failed send times out normally.
Defect 3 itself is not changed here. Cancelling timed-out receives from the idle poll path would mark receives CANCELLED while writes may still be active and free their KV pages early, so that needs the in-flight-cancel / ownership machinery and belongs in a separate change.
Tradeoffs and limits.
- A context send whose peer never asks (e.g. the generation request was cancelled or rejected while still queued) now holds its KV for up to 3x kv_transfer_timeout_ms instead of 1x, which under overload slows context admission. Nothing tells the context side today that such a peer is gone; ending the wait early needs a generation-to-context cancel signal.
- Under context attention DP, a REQUEST_DATA arriving more than _RETIRED_SESSION_TTL_S (600 s) after its session was cleared is still parked and dropped silently.
- Without physical ownership, the 2x bound on a failed receive is a timing guarantee, not proof that a stalled writer's RDMA has stopped; only the ownership mode gives that.
Removes the test's waiver (tests/integration/test_lists/waives.txt).

Relation to other PRs

[https://nvbugs/6621362][fix] Fix disagg gen stall by aborting peer RX slice on failed KV send #17948 (closed): its named exit, _deliver_kv_to_agent with no session, is not the one hit here; the hit exit is _respond_with_kv. Its context peer-wait rebase idea is right and is adopted here with the same 3x ceiling.
[https://nvbugs/6621362][fix] fix disagg retry #18517 (main): it re-keys the transfer so a retried generation request can be served while the context session is still live. Here such a retry is refused (FAILED) instead of hanging; serving it is left to that change.
[TRTLLM-17083][feat] Cancel paired GEN on CTX failure or cancellation #20491 (main): the router cancels the paired generation request when the context request fails or is cancelled in generation-first mode. That covers a context failure before any send session exists, which this change cannot see; it does not touch the transfer-layer timeouts handled here, and this test runs context-first.

Test Coverage

Clean A/B on 2x H100 NVL (computelab), release/1.3 42ca6baa81 with and without this change: separate fresh worktrees, the same precompiled CI wheel and environment, differing only by this PR. The diagnostic rows change only the test YAML and were not committed. They put the generation worker in the bottleneck that the CI runs hit; on this node the stock config leaves context as the bottleneck.

Stress test config	release/1.3	release/1.3 + this PR
stock	0/2705 errors, GSM8K 0.761, PASS	0/2705 errors, GSM8K 0.767, PASS
generation `max_batch_size: 24`	75.71% errors (2048 x HTTP 500), FAIL: 196 context timeouts, 24 generation timeouts, generation worker deadlocked	0/2705 errors, GSM8K 0.757, PASS: 0 context/generation timeouts
generation `max_batch_size: 24`, `kv_transfer_timeout_ms: 30000` (previous revision `57bb2b4`)	(not run)	0/2705 errors, GSM8K 0.753, PASS
generation `max_batch_size: 24`, `kv_transfer_timeout_ms: 10000` (previous revision `57bb2b4`; diagnostic: forces context timeouts past the 3x peer-wait ceiling)	(not run)	850 context timeouts; all 1529 late REQUEST_DATA answered FAILED and seen by the generation worker; 0 generation timeouts; generation keeps admitting (no deadlock). Errors expected by construction; stopped before the gate

accuracy/test_disaggregated_serving.py::TestQwen3_5_4B::test_mismatched_block_reuse: 71.0 (release/1.3) vs 76.0 (with this PR), both PASS.
Unit tests (CPU):
- tests/unittest/disaggregated/test_transfer_ownership_regressions.py: a REQUEST_DATA for a cleared session is answered FAILED rather than parked, including a retried request id; the reply is followed end to end through a real Receiver and RxSession into a single error retirement; an early generation-first REQUEST_DATA is still parked; markers expire oldest first; a live send waits until every peer rank has asked (also while earlier ranks are being written) and records when they had, storing that time before it marks the session ready; a retry whose session is still live is answered FAILED; with two writers, one writer's FAILED keeps the receive open on every poll path until the other reports success or failure, a local cancel or a peer's CANCEL_SESSION after the failure does not free it early, and a writer silent past the 2x bound no longer pins it; a stale REQUEST_DATA is answered FAILED when swept without attention DP, dropped silently under attention DP, and kept while its session is live.
- tests/unittest/_torch/disaggregation/test_disagg_coordinator_transfers.py: the context clock ignores the peer wait, is measured from when the peers asked even if that happened between two checks, and still times out past the ceiling.
- tests/unittest/_torch/disaggregation/ (318 passed) and all CPU tests under tests/unittest/disaggregated/ (824 passed) and the GPU transfer tests there (132 passed).

Not verified: H100 SXM (no node available); multi-rank senders or receivers (ctx TP>1, gen TP4) on GPU, covered by unit tests only; the other waivers filed under this bug (gpt_oss_120b_eagle_triton_stress, full:B200/...qwen3_32b_fp8_stress) are left in place; the port to main.

PR Checklist

Please review the following before submitting your PR:

PR description clearly explains what and why. If using CodeRabbit's summary, please make sure it makes sense.
PR Follows TRT-LLM CODING GUIDELINES to the best of your knowledge.
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🤖 Generated with Claude Code

… by a context-side timeout On the Python V2 transceiver route, test_disaggregated_stress_test [input8k-output1k-conc512-qwen3_5_4b_fp8_stress] failed with a 77-100% aiperf error rate. The generation worker ended up deadlocked: nothing scheduled, request fetch frozen, ~32% of its KV pages still held. Three defects combine: 1. The context-side kv_transfer_timeout_ms clock starts when the send is posted. Nothing is written until the generation peer asks for the data, and with generation max_batch_size (128) below the offered concurrency (512) that request waits in the generation queue for longer than the timeout. Context sends expire before their peer ever asks, and the session is cleared. 2. Sender._respond_with_kv treats a REQUEST_DATA for a session that is no longer registered as an early generation-first request and parks it. For a session that was already cleared, nothing ever answers, so the peer's receive task stays TRANSFERRING forever. 3. Without in-flight cancellation, a generation receive that hit its own timeout is cancelled only by the executor's response pass, which runs only after a forward step. Once every generation slot holds such a receive, nothing is scheduled, the pass never runs, and the worker stops admitting requests for good. Fixes: - The Sender remembers cleared TxSession ids for a while and answers a REQUEST_DATA for one of them FAILED, matching by the peer's sender_req_id too so a retried generation request is covered. - DisaggTransferCoordinator.poll_gen_transfers cancels timed-out generation receives every iteration, independent of a forward step. - The context transfer clock is moved along while the send still waits for its peer to ask (new KvCacheTransceiver hook context_transfer_is_waiting_for_peer, implemented by KvCacheTransceiverV2), bounded at 3x kv_transfer_timeout_ms so a send whose peer never asks is still reclaimed. Verified on 2x H100 NVL, release/1.3 42ca6ba + this change: the stress test passes (0/2705 errors, GSM8K 0.756 >= 0.72); without it the error rate is 76.75%. Remove the test's waiver. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Bo Deng <deemod@nvidia.com>

coderabbitai · 2026-10-16T05:32:25Z

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tensorrt_llm/_torch/disaggregation/native/transfer.py
tensorrt_llm/_torch/disaggregation/transceiver.py
tests/unittest/disaggregated/test_transfer_ownership_regressions.py

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Walkthrough

The change adds peer-readiness queries and bounded peer-wait handling for context-send timeouts. It tracks retired sender sessions, rejects stale requests, delays failed-receive retirement, and removes one integration-test skip entry.

Changes

Disaggregation timeout and session lifecycle handling

Layer / File(s)	Summary
Peer readiness and bounded context-send timeout `tensorrt_llm/_torch/disaggregation/kv_cache_transceiver.py`, `tensorrt_llm/_torch/disaggregation/transceiver.py`, `tensorrt_llm/_torch/disaggregation/native/transfer.py`, `tensorrt_llm/_torch/disaggregation/orchestration/coordinator.py`, `tests/unittest/_torch/disaggregation/test_disagg_coordinator_transfers.py`, `tests/unittest/disaggregated/test_transfer_ownership_regressions.py`	The transceiver exposes peer-wait status and readiness time. The coordinator defers context-send timeout checks during bounded peer waits. Tests cover readiness and timeout behavior.
Retired sessions and failed-receive retirement `tensorrt_llm/_torch/disaggregation/native/transfer.py`, `tensorrt_llm/_torch/disaggregation/transceiver.py`, `tests/unittest/disaggregated/test_transfer_ownership_regressions.py`, `tests/unittest/disaggregated/test_task_handle.py`	The sender retains and expires retired request IDs and rejects retired or conflicting requests. Failed receives remain active while writers report results. Tests cover request routing, cleanup, writer completion, and retention expiry.

Stress test coverage

Layer / File(s)	Summary
Stress test waiver removal `tests/integration/test_lists/waives.txt`	The skip-list entry for the Qwen3.5 4B FP8 disaggregated stress test is removed.

Priority: High

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Coordinator
  participant KvCacheTransceiverV2
  participant TxSession
  Coordinator->>KvCacheTransceiverV2: Query peer-wait status and peer-ready time
  KvCacheTransceiverV2->>TxSession: Read receiver readiness and peer-ready time
  TxSession-->>KvCacheTransceiverV2: Return readiness and timestamp
  KvCacheTransceiverV2-->>Coordinator: Return peer-wait status and timestamp
  Coordinator->>Coordinator: Defer timeout or check elapsed transfer time

Merge Risk: Minimal · up to a01c3

The reviewed changes have no established outstanding PR-introduced issue that blocks merging. Normal test and CI checks still apply.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 58.18% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 55 functions across 8 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

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Check name	Status	Explanation
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chienchunhung

Thanks for the PR; most of the critical findings are already covered by other folks. I can take another review pass once they are addressed.

Overall I think this change addresses an important lifecycle gap: GEN receives an explicit failure when it requests KV from a retired CTX transfer, and idle GEN workers can act on receive timeouts.

One suggestion: exercise the actual failure reply through the receiver, including retried request IDs. This would verify that GEN observes failure without waiting for its own timeout or a forward pass, and that resources are released exactly once when safe.

Not required for this PR but we should also implement a separate early-cancel mechanism. If CTX fails or is cancelled, orchestration should prevent GEN submission where possible or propagate cancellation to an existing GEN request. This matters especially when CTX fails before creating a transfer session, since there is no retired-session record to identify that failure here. Tests should confirm cancellation reaches the worker, beyond closing the frontend HTTP task. Early cancellation and late-request handling are complementary. Both must keep logical termination separate from physical resource reclamation: exposed memory must remain protected until transfer access has ended. This PR can land independently once the existing review concerns and required validation are addressed.

mikeiovine

Stamp on behalf of runtime devs, delegating proper review to @NVIDIA/trt-llm-disagg-devs

… bound peer wait to live sends Follow-up to the previous commit. - Drop the poll-time cancellation of timed-out generation receives. Without in-flight cancellation, cancel_request marks a receive CANCELLED even while a write is still active, and the reap that follows would free its KV pages before the write finishes. It also ran outside the TP vote and could enqueue an ADP timeout twice. It is not needed for this failure: once the context side answers a late REQUEST_DATA with FAILED, the stuck receive turns terminal through the normal error reap. - Treat a context send as waiting for its peer only while its session is still live and INIT. A send retired by a peer's CANCEL_SESSION has no peer request info left either, and must time out normally instead of being held for the whole peer-wait ceiling. - Expire retired-session markers oldest first, so a sweep only visits expired entries instead of scanning every marker under the session lock. - Test the FAILED reply end to end through a real Receiver and RxSession, including a retried request id, and the incremental expiry. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Bo Deng <deemod@nvidia.com>

bo-nv · 2026-10-19T04:53:47Z

/bot run --disable-fail-fast

tensorrt-cicd · 2026-10-19T05:01:35Z

PR_Github #78802 [ run ] triggered by Bot. Commit: 57bb2b4 Link to invocation

… refuse retries of live sends - A context send now waits for its peers while the session is live and not every peer rank has asked yet (receiver_ready). Its status cannot tell: with several receiver ranks the first rank's writes make it TRANSFERRING while other ranks are still queued. - The send records when every peer rank had asked (peer_ready_time), and the transfer timeout is measured from that moment. Moving the clock only at poll time charged the gap between the last poll and the peers' arrival to the transfer. The peer wait is bounded from the send itself, so py_kv_transfer_peer_wait_start is no longer needed. - A retried generation request carries a fresh unique_rid. When the context session it names is still live, the lookup by the fresh id missed it and the request was parked forever. Answer it FAILED: serving it would need every reply keyed by the receiver's id and could write the same pieces to two attempts. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Bo Deng <deemod@nvidia.com>

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Review comments at @tensorrt_llm/_torch/disaggregation/native/transfer.py:
- Line 1853: In `_save_peer_req_info` and `setup_session`, assign
`session.peer_ready_time` before setting `receiver_ready` so the coordinator
cannot observe readiness before the timestamp and uses the full post-readiness
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tensorrt_llm/_torch/disaggregation/kv_cache_transceiver.py
tensorrt_llm/_torch/disaggregation/native/transfer.py
tensorrt_llm/_torch/disaggregation/orchestration/coordinator.py
tensorrt_llm/_torch/disaggregation/transceiver.py
tests/unittest/_torch/disaggregation/test_disagg_coordinator_transfers.py
tests/unittest/disaggregated/test_transfer_ownership_regressions.py

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tensorrt-cicd · 2026-10-19T08:21:49Z

PR_Github #78802 [ run ] completed with state SUCCESS. Commit: 57bb2b4
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…_ready The executor reads a send session's receiver_ready and peer_ready_time without the session lock. Both setup_session and _save_peer_req_info set receiver_ready first, so a timeout check between the two stores saw the peer as ready with no ready time and measured the transfer from when the send was posted. A send whose peers waited past the timeout could then expire right after they asked. Set the time before the flag in both. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Bo Deng <deemod@nvidia.com>

bo-nv · 2026-10-19T09:57:32Z

/bot run --disable-fail-fast

bo-nv · 2026-10-19T09:59:35Z

/bot run --disable-fail-fast

tensorrt-cicd · 2026-10-19T10:05:20Z

PR_Github #78891 [ run ] triggered by Bot. Commit: 292e1d1 Link to invocation

tensorrt-cicd · 2026-10-19T10:13:05Z

PR_Github #78893 [ run ] triggered by Bot. Commit: 292e1d1 Link to invocation

…he stale sweep self_rank_info is always a RankInfo, which carries dp_size (default 1), so the getattr fallback is unnecessary. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Bo Deng <deemod@nvidia.com>

bo-nv · 2026-10-22T03:49:41Z

/bot run --disable-fail-fast

tensorrt-cicd · 2026-10-22T03:55:46Z

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bo-nv · 2026-10-22T21:56:14Z

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bo-nv

Verifying the other 2 waived cases locally.

Signed-off-by: Bo Deng <deemod@nvidia.com>

bo-nv · 2026-10-24T08:52:21Z

/bot skip --comment "just unwaive another tests; Passed CI: https://prod.blsm.nvidia.com/sw-tensorrt-top-1/job/LLM/job/helpers/job/PR_Github/80085/"

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Skipping testing for commit e0eba97

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Resolve the conflict in Sender.sweep_stale_req_infos with main (NVIDIA#20938), which already answers FAILED to orphaned REQUEST_DATA, selected by the new RecvReqInfo.context_first flag. main's rule is kept instead of NVIDIA#20459's "no attention DP" rule, since main requires swept generation-first entries to stay silent and the qwen3_5_4b_fp8_stress case is context-first. The sweep unit test is adapted to the context_first rule. Signed-off-by: Bo Deng <deemod@nvidia.com>

…gg transfers stalled by a context-side timeout (#20943) Signed-off-by: Bo Deng <deemod@nvidia.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

bo-nv requested review from a team as code owners October 16, 2026 05:24

bo-nv requested review from Tabrizian, lori-ren and nv-xtf October 16, 2026 05:24

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Shixiaowei02 reviewed Oct 16, 2026

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Comment thread tensorrt_llm/_torch/disaggregation/orchestration/coordinator.py Resolved

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Comment thread tensorrt_llm/_torch/disaggregation/transceiver.py Resolved

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mikeiovine approved these changes Oct 16, 2026

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chienchunhung mentioned this pull request Oct 16, 2026

[TRTLLM-17083][feat] Cancel paired GEN on CTX failure or cancellation #20491

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Shixiaowei02 reviewed Oct 19, 2026

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Comment thread tensorrt_llm/_torch/disaggregation/transceiver.py Resolved

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Comment thread tensorrt_llm/_torch/disaggregation/orchestration/coordinator.py Resolved

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