fix(dash-spv)!: keep masternode sync live after refused responses by shumkov · Pull Request #1205 · dashpay/rust-dashcore

shumkov · 2026-10-20T18:59:52Z

Based on dev; followed by #1206. At review the engine changes this PR carried (atomic QRInfo feed, typed header storage errors) were split out into #1211, now merged; this PR keeps the masternode sync policy that uses them. Retries go out like any other request: the sync layer does not choose peers.

Basic explanation

The masternode sync in dash-spv had several ways to stall for good or to spin once a peer's response is refused: a sync whose QRInfos all failed ended in SyncState::Error, which nothing leaves, an mnlistdiff that no peer answered or whose block left the chain was re-requested forever, one refused mnlistdiff gave its target up while a peer repeating a refused QRInfo spent another attempt each time, and a refused tip update was re-requested on every 100 ms tick. All of them exist on dev today. They become more likely once diffs are refused for not matching their block's coinbase (#1206), so they are fixed first.

What changes

No dead end after failed QRInfos. When every attempt fails on an empty engine, the manager stays Syncing with nothing in flight, and the existing stall watchdog starts a fresh budget. The masternode manager no longer reports SyncState::Error. The test that asserted giving up must not leave Syncing now asserts the state the watchdog restarts from.
Bounded mnlistdiff retries. A response must carry the requested base. Each target gets three attempts, spent by a timeout, by a block the header chain cannot place, or by a refusal from a peer that had not refused it before; a repeat refusal from the same peer spends nothing. A peer disconnect moves a target back to pending without spending an attempt, so a target is also given up 60 s after its first send, whatever attempts it has left: four 15 s timeouts, so it only cuts short sends that a disconnect restarted. Before, peers dropping one after another kept a request no peer answered in flight forever. A given-up target completes the pipeline as an applied diff does. A full disconnect gives every target fresh attempts and a new lifetime. On dev, timeouts and unknown heights were retried forever (after a reorg one unanswerable request blocked every later tip update and QRInfo) and an engine refusal dropped the target on first sight.
Given-up work-block lists are asked for again. A tip update asks for the work-block lists of the quorums it brings. A list given up is remembered and asked for again with the next tip update, with fresh attempts and from the nearest lower list the engine holds, while a quorum of the newest list needs it. Each time it is given up again it waits twice as many tip updates, up to every 32nd, and a full disconnect resets the wait. Otherwise its quorum stayed Skipped(MissedList) until the next QRInfo, up to a rotation cycle later, and Platform proofs over it failed meanwhile.
A refusing peer cannot spend more. A later mnlistdiff for a target from a peer whose response for it was refused is ignored, and so is another QRInfo for the requested tip from a peer whose QRInfo for it was rejected, without spending anything. The QRInfo record outlives budgets at the same tip and is dropped when a QRInfo for another tip goes out, on success and on a full disconnect. A retry goes out like the first request, to whichever peer the network picks.
A header storage failure is not the peer's fault. A QRInfo the engine could not judge (FeedError::HeaderStorage, from fix(dash-spv)!: leave the masternode engine untouched by a refused or interrupted QRInfo #1211) is retried without recording its peer as a refuser, while one naming a block the chain does not hold still counts against the peer, since those blocks are its choice. On the mnlistdiff path a storage failure is not charged to the peer either. A given-up work-block list is kept while the headers that say whether a quorum still needs it do not read.
Tip guard. A tip update that was given up is not asked for again until the header tip moves.

Breaking

No API changes. Behavior: the masternode manager no longer enters SyncState::Error; an mnlistdiff whose base is not the requested one is ignored; a refused or unanswered mnlistdiff request is sent at most three times and given up 60 s after its first send.

Known limits

A retry goes to whichever peer the network picks, round-robin over the peers answering headers, filters and blocks fast enough, so it can land on the peer that refused. Its answer is then ignored and the attempt ends at its timeout: 15 s for an mnlistdiff, 30 s then 60 s for a QRInfo retry. With one such peer, every retry does. Bounded, never a dead state, and a refuser then costs what a peer silent on masternode requests already costs on dev. Where this is slower than dev:
- a tip update refused by a peer whose two retries land on it again is given up after about 30 s and waits for the next block, where the 100 ms re-ask loop of dev could reach another peer sooner;
- in a cycle's DKG mining window, a refused QRInfo whose retries land on the refuser holds the tip updates back for up to 90 s per tip, where dev spends the three attempts on the refusals at once and resumes them;
- a peer whose refusal was transient is ignored for that target or tip.
Sending retries away from refusing peers needs the network layer to support it (feat(dash-spv)!: let a network request avoid given peers #1212).
A peer whose QRInfo was refused is ignored for that tip until the tip moves or every peer disconnects, even when it is the only peer connected: on a static regtest or devnet chain with one peer, one refusal stops QRInfo recovery until the next block. A bounded cooldown or an explicit fallback is a possible follow-up. Exempting QRInfo refusals for blocks the chain does not hold is not, since a QRInfo's blocks are the peer's choice.
A response is matched to its request by base and target, not by the peer that was asked, so peers that were never asked can spend a target's three attempts: an attacker with three peer slots can give a request up before the honest answer arrives (on dev, one slot was enough). Charging only the asked peer needs the network layer to report which peer a request went to.
A peer disconnect moves in-flight requests back to pending until the next 100 ms tick re-sends them, and a response arriving in between is dropped. With the lifetime, drops paced to an honest peer's latency can now give a target up.
A work-block list no peer serves delays the MasternodeStateUpdated of each tip update it is asked for again with by up to its 60 s lifetime. The backoff makes that one tip update in 32 once the list has been given up six times.
After a reorg that orphans the newest list, requests built on it are now dropped instead of hanging, and following the fork drops the lists above it (fix(dash-spv): drop masternode lists above a followed fork, refuse forks below the checkpoint #1201). The restart that follows a fork starts this PR's retry state afresh, and fork detection acts on headers before they are validated (dash-spv: protect fork recovery against malicious headers #1103, dash-spv: fork detection acts on headers before they are validated #1193), so any peer can trigger it, clearing the QRInfo refusers, the given-up lists and the retry budgets.
The stall watchdog does not back off: a deterministic QRInfo failure costs three feeds a minute.

Tests

Each fix has a test that fails without it. The commit messages name it and what failed. The commits that only add tests name the mutation their tests catch.

Red to green: qrinfo_attempts_exhausted_on_an_empty_engine_are_retried_by_the_watchdog, an_mnlistdiff_whose_block_stays_unknown_is_given_up_after_three_attempts, test_unanswered_request_is_given_up_after_three_attempts, an_mnlistdiff_from_another_base_is_ignored, a_refused_tip_update_is_retried_then_given_up, a_tip_update_completes_when_its_work_block_list_is_given_up, a_peer_whose_qrinfo_was_rejected_is_ignored, a_given_up_tip_update_is_not_asked_again_until_the_tip_moves, a_tip_update_whose_peers_keep_dropping_is_given_up_within_its_lifetime, a_target_gets_a_new_lifetime_from_the_peers_after_a_full_disconnect, a_target_s_lifetime_outlasts_its_attempts, a_qr_info_our_header_storage_could_not_read_is_not_held_against_its_peer, a_given_up_work_block_list_is_asked_again_with_the_next_tip_update, a_work_block_list_given_up_again_is_asked_for_less_and_less_often, a_given_up_work_block_list_is_kept_while_the_headers_do_not_read, a_full_disconnect_has_a_given_up_work_block_list_asked_with_the_next_tip_update.

Pinned by mutation: an_initial_sync_completes_when_a_work_block_list_is_given_up, and the disconnect, local-gap and refuser lifecycle tests of 5b35fb3.

Verified at this branch's tip (aa4630b, on dev 0dcdd82): cargo fmt --all -- --check, typos 1.40.0, cargo +1.89 check --workspace --all-features, cargo clippy --workspace --all-targets --all-features -- -D warnings, cargo doc --workspace --all-features --no-deps with -D warnings, cargo test --workspace --all-features with dashd 23.1 (2902 passed, none failed: dashd_masternode 11/11, dashd_sync 35/35, dash-spv-ffi dashd_sync 7/7), and every commit on its own builds, lints and passes the dash-spv unit tests.

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PR Hygiene · `aa4630b`

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Approvals
- dash-spv (dash-spv/src/sync/download_coordinator.rs, dash-spv/src/sync/masternodes/manager.rs, dash-spv/src/sync/masternodes/pipeline.rs and 1 more) — QuantumExplorer or ZocoLini or xdustinface
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Summary by CodeRabbit

Reliability
- Improved masternode synchronization by retrying requests across peers and handling timeouts more consistently.
- Prevented repeated requests to peers that have already refused the same data.
- Added backoff for work-list retries after repeated failures, while allowing retries when the chain tip changes.
Bug Fixes
- Improved validation of masternode list responses to ensure they match the requested data.
- Prevented synchronization from being marked complete when required quorum data is unavailable.

coderabbitai · 2026-10-20T19:00:04Z

Walkthrough

The sync pipeline now bounds MnListDiff attempts and request lifetimes. The manager tracks peer refusals, distinguishes local data gaps, and records given-up tip updates and work-block lists. QRInfo retry state is also tracked per tip, with watchdog and disconnect handling.

Changes: Masternode synchronization

Layer / File(s)	Summary
Bounded MnListDiff retries `dash-spv/src/sync/download_coordinator.rs`, `dash-spv/src/sync/masternodes/pipeline.rs`	The pipeline tracks attempts, refusing peers, and request lifetimes. It validates response base hashes, returns exhausted targets, and adds test coverage for retry limits and lifetime behavior. The coordinator adds methods to release in-flight keys and query or clear retry counts.
MnListDiff sync orchestration `dash-spv/src/sync/masternodes/manager.rs`, `dash-spv/src/sync/masternodes/sync_manager.rs`	The manager applies retry and give-up results to tip updates and work-block-list requests. It distinguishes local data gaps from peer refusals, retries needed work lists on later tip updates with capped backoff, and advances or completes the pipeline as appropriate. Tests cover retry, give-up, disconnect, and work-list recovery paths.
QRInfo and sync recovery `dash-spv/src/sync/masternodes/manager.rs`, `dash-spv/src/sync/masternodes/sync_manager.rs`	The manager records QRInfo refusals per peer and tip. It clears refusal state on successful processing, tip changes, and full disconnects. Tests cover local storage failures, exhausted retries, and watchdog redispatch.

Priority: Normal

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant MnListDiffPeer
  participant MasternodesSyncManager
  participant MnListDiffPipeline
  participant MasternodeListEngine
  MnListDiffPeer->>MasternodesSyncManager: Deliver diff with base and target hashes
  MasternodesSyncManager->>MnListDiffPipeline: Check in-flight target and base hash
  MasternodesSyncManager->>MasternodeListEngine: Apply matching diff
  MasternodeListEngine-->>MasternodesSyncManager: Return result
  MasternodesSyncManager->>MnListDiffPipeline: Retry or give up target
  MnListDiffPipeline-->>MasternodesSyncManager: Return retry or give-up status

Possibly related PRs

dashpay/rust-dashcore#1211: Adds explicit refusal errors that this sync flow uses to distinguish peer refusals from local failures.
dashpay/rust-dashcore#1200: Adds MnListDiff validation that can reject diffs handled by this retry flow.
dashpay/rust-dashcore#1212: Adds peer-avoidance routing for retryable QRInfo and MnListDiff requests, which concerns the same sync retry behavior.

Merge Risk: Moderate · up to aa463

Sync can remain stalled after a local data gap is repaired because retries ignore the responding peer. Distinguish local gaps from peer refusals before merging.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely summarizes the main change: keeping masternode synchronization active after refused responses.
Docstring Coverage		Docstring coverage is inconclusive: files from earlier reviews still need to be rechecked within the check's analysis limits. Not blocking.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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codecov · 2026-10-20T19:11:38Z

Codecov Report

❌ Patch coverage is 98.23183% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.47%. Comparing base (0dcdd82) to head (aa4630b).
⚠️ Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
dash-spv/src/sync/masternodes/sync_manager.rs	98.03%	15 Missing ⚠️
dash-spv/src/sync/masternodes/manager.rs	97.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1205      +/-   ##
==========================================
+ Coverage   79.24%   79.47%   +0.22%     
==========================================
  Files         304      304              
  Lines       81511    82472     +961     
==========================================
+ Hits        64593    65544     +951     
- Misses      16918    16928      +10

Flag	Coverage Δ
core	`77.83% <ø> (ø)`
ffi	`53.17% <ø> (+0.07%)`	⬆️
rpc	`52.05% <ø> (ø)`
spv	`92.69% <98.23%> (+0.22%)`	⬆️
wallet	`82.54% <ø> (ø)`

Files with missing lines	Coverage Δ
dash-spv/src/sync/download_coordinator.rs	`100.00% <100.00%> (ø)`
dash-spv/src/sync/masternodes/pipeline.rs	`98.54% <100.00%> (+0.65%)`	⬆️
dash-spv/src/sync/masternodes/manager.rs	`97.03% <97.14%> (+<0.01%)`	⬆️
dash-spv/src/sync/masternodes/sync_manager.rs	`98.30% <98.03%> (-0.56%)`	⬇️

... and 8 files with indirect coverage changes

github-actions · 2026-10-20T21:29:09Z

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ZocoLini

can you split the PR?? I can take care of it if you want

github-actions · 2026-10-21T13:32:02Z

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- The comment on a refused QRInfo says only a refusal is held against its peer. - The QRInfo retry no longer says the engine rejected a response it could not judge. - Two test docs read more plainly. No behavior changes beyond a log message, so no test. Co-Authored-By: Claude Opus 5.5 <[email protected]>

A full disconnect gives every target fresh attempts and forgets what the old peers refused, but a work-block list given up again kept its wait: when the old peers were why it went unserved, the new ones were asked for it only after up to 32 tip updates, where before the backoff they were asked with the next one. A full disconnect now has every given-up list asked for with the next tip update and its backoff start over. The test asking for a list again now also checks that the list is forgotten once applied, which no test pinned: dropping that removal left every test green. Test would have caught this in CI: `a_full_disconnect_has_a_given_up_work_block_list_asked_with_the_next_tip_update`. ✖ before the fix (the list waited out its backoff), ✔ after. Co-Authored-By: Claude Opus 5.5 <[email protected]>

The base branch was changed.

shumkov · 2026-10-27T12:34:00Z

@ZocoLini @xdustinface #1205 no longer depends on #1212. I removed the peer-avoidance retries and rebased it onto dev, so it can be reviewed and merged on its own while #1212 waits for #902. Retries are still capped at 3 attempts / 60 s. The cost of dropping avoidance (a retry can land on the same refusing peer) is under "Known limits". #1206 is restacked on top. CI is green on both. Ready for a look when you have time.

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Actionable comments posted: 1

🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @dash-spv/src/sync/masternodes/sync_manager.rs:
- Around line 146-154: Update the `feed_qr_info` error handling so local QRInfo
gaps, including wrapped `BlockHashLookupFailed` and `MissingStartMasternodeList`
errors, do not mark the peer as refusing the tip. Continue recording genuine
`FeedError::Refused` errors through `qrinfo_refused_by`.

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dash-spv/src/sync/masternodes/manager.rs
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github-actions · 2026-10-27T12:44:28Z

Bots are done — your move: address ZocoLini requested changes, then post /self-reviewed.
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shumkov · 2026-10-27T14:08:56Z

/self-reviewed

github-actions · 2026-10-27T14:09:55Z

Ready for review — dash-spv: QuantumExplorer or ZocoLini or xdustinface · re-review or resolve: ZocoLini.
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github-actions · 2026-10-28T06:54:11Z

This PR has merge conflicts with the base branch. Please rebase or merge the base branch into your branch to resolve them.

shumkov · 2026-10-30T09:23:31Z

@xdustinface sure, it's yours. Notes from reworking it onto #902 (not pushed; the branch here is still the pre-#902 version):

Still needed on top of refactor(dash-spv): network module rewrite #902 and fix(dash-spv)!: verify MnListDiff against its block's coinbase before applying #1200:
1. an empty engine must stay Syncing, not go to Error, after QRInfo refusals;
2. a refused tip diff is re-asked at round-trip rate, so it needs a tip guard;
3. a bounded number of attempts per target, ignoring the refusing peer's repeats and matching the base as well as the target;
4. a lifetime per target, because the broker never gives up;
5. targets dropped by clear_pending must be answered to the broker, or it re-sends them forever.
Open question: on an idle network refactor(dash-spv): network module rewrite #902 routes a retry to the same first peer. Leaving the refuser's repeat unanswered makes the broker kick it (10-minute ban), which rotates peers. But if our checks ever refuse what every honest peer serves, it bans them two at a time. Answering the broker and giving up after the lifetime never kicks, but a refusing first peer can then stall tip updates. A way for the sync layer to tell the broker "try another peer" would avoid both.
Two gaps in fix(dash-spv)!: verify MnListDiff against its block's coinbase before applying #1200 would make every peer look like a refuser: an unknown LLMQType re-encodes as 0, so the quorum root stops matching once Core mines a new quorum type; and a future CbTx layout stays a raw payload, which verify_coinbase_roots refuses. Smaller ones: pre-DIP3 targets on regtest are refused, and extract_matches uses Bitcoin's 16,666-transaction bound where a Dash block holds about 33,333.

ZocoLini · 2026-11-02T10:22:44Z

I think this can be closed now #1258 got merged

shumkov requested review from QuantumExplorer, ZocoLini and xdustinface October 20, 2026 18:59

shumkov mentioned this pull request Oct 20, 2026

feat(dash-spv)!: check masternode list diffs against the block coinbase #1206

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feat(dash-spv)!: check masternode list diffs against the block coinbase #1077

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fix(dash-spv)!: verify MnListDiff against its block's coinbase before applying #1200

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fix(dash-spv)!: keep masternode sync live on bad or missing diffs #1258

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PastaPastaPasta mentioned this pull request Nov 1, 2026

fix(dash-spv): take the non-rotating member-selection ChainLock from the work block's coinbase #1284

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This was referenced Nov 3, 2026

fix: read a coinbase payload of a newer version #1306

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fix(dash)!: bound partial merkle trees by Dash's block size #1307

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fix(dash)!: keep the type byte of quorum types this crate does not know #1308

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shumkov commented Oct 20, 2026 •

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PR Hygiene · `aa4630b`

coderabbitai Bot commented Oct 20, 2026 •

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codecov Bot commented Oct 20, 2026 •

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github-actions Bot commented Oct 20, 2026 •

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github-actions Bot commented Oct 21, 2026 •

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github-actions Bot commented Oct 21, 2026 •

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github-actions Bot commented Oct 27, 2026 •

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