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fix: exempt a MN's own ProRegTx from collateral-reuse mempool conflicts - #7638
Follow-up to #7489. The collateral-reuse conflict checks it added can reject a valid transaction, because they only test that some matching mempool entry exists — they never check whose entry it is.
The failure sequence:
Masternode X is registered with external collateral C, and a ProUpServTx for X is sitting in the mempool.
The block containing X's ProRegTx is disconnected (reorg or invalidateblock).
The reorg logic resubmits the disconnected ProRegTx to the mempool. At that moment dmnman's tip list has not been rolled back yet — SynchronousUpdatedBlockTip() only fires after MaybeUpdateMempoolForReorg() has run — so GetMNByCollateral(C) still resolves to X.
The same stale tip list causes a second misfire. When the new branch re-mines X's ProRegTx, ConnectTip() calls removeForBlock() before the tip list moves, so removeProTxConflicts() resolves the collateral to X and evicts X's pending updates. Those updates remain valid once the registration is connected.
Both outcomes are wrong. The resubmitted ProRegTx "replaces" the masternode it itself created, i.e. it replaces nothing, and registration followed by update is a perfectly mineable pair — there is no conflict to prevent.
What was done?
Exempt a masternode's own registration from the collateral-reuse conflict, in both directions:
removeProTxConflicts() (block eviction) skips removeProTxReferences() when the resolved masternode's proTxHash equals the connected ProRegTx's own hash.
The ProRegTx branch of existsProviderTxConflict() skips the mapProTxRefs lookup when the resolved masternode's proTxHash equals the incoming transaction's own hash.
The three update branches (ProUpServTx/ProUpRegTx/ProUpRevTx) now share one collateralReusedInMempool() helper that requires the pending ProRegTx to be a different transaction, mirroring the it->second != proTxHash form the neighbouring mapProTxAddresses/mapProTxPlatformNodeIDs checks already use. This also deduplicates the check fix: conflict ProRegTx collateral reuse with in-mempool masternode updates #7489 spelled out three times.
The update-side change is defensive rather than a reachable bug today: CheckSpecialTx() rejects an update for an unconfirmed masternode before existsProviderTxConflict() runs, so only the ProRegTx direction can currently misfire. Making the identity requirement explicit keeps the two directions symmetric instead of accidentally different.
How Has This Been Tested?
Extended test_mempool_proreg_replacement_update_conflict in src/test/evo_deterministicmns_tests.cpp:
a removeForBlock() case: a pending update survives a block that connects the masternode's own ProRegTx while the tip list still contains the masternode. It fails without the guard;
negative controls for the exemption in both directions: with an update pending, the masternode's own ProRegTx must be accepted; with the masternode's own ProRegTx pending, its updates must be accepted.
The three negative-control assertions fail on current develop without the fix (verified against the #7489 merge commit) and pass with it; evo_dip3_activation_tests passes (38 cases). Built and run on macOS/arm64.
Note: #7728 moves the MN-list tip before MaybeUpdateMempoolForReorg re-adds transactions. That removes the admission-side trigger in practice, but not the removeForBlock one, and the identity checks are correct either way.
Breaking Changes
None. Mempool policy only, and strictly narrowing: the only newly-accepted pairs are a masternode's own registration alongside its own updates, which are mineable together.
Checklist:
I have performed a self-review of my own code
I have commented my code, particularly in hard-to-understand areas
I have added or updated relevant unit/integration/functional/e2e tests
I have made corresponding changes to the documentation
Mempool conflict checks now distinguish a replacement registration from a masternode’s own registration. Registration, service-update, registrar-update, and revoke-update checks use this distinction. Deterministic tests cover replacement conflicts with pending updates and verify that the masternode’s own registration and updates remain non-conflicting.
The change exempts a masternode's own registration from collateral-reuse conflicts, but updates that keep the same address or operator key still conflict with it, or are evicted when the registration is re-mined during a reorg. Close this gap and extend the tests before merging if the intent is full coverage; the effect is limited to mempool handling in reorg scenarios.
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Description check
The description clearly explains the collateral-reuse conflict, the ProRegTx exemption, the shared update-check helper, and the regression tests.
Title check
The title clearly and concisely identifies the main change: exempting a masternode's own ProRegTx from collateral-reuse mempool conflicts.
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Actionable comments posted: 1
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Inline comments:
In `@src/test/evo_deterministicmns_tests.cpp`:
- Around line 1548-1550: Add a negative conflict assertion for
CTransaction(tx_up_reg) alongside the existing existsProviderTxConflict checks
in the pending tx_reg test setup, ensuring ProUpRegTx is verified as
non-conflicting while tx_reg remains in testPool.
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Exempt same-key registrar updates from the self-registration check
When the pending update is a ProUpRegTx that changes only the voting key or payout script while retaining the operator key, the disconnected MN's own ProRegTx still never reaches this new self-exemption: the earlier mapProTxBlsPubKeyHashes.count(proTx.pubKeyOperator.GetHash()) check returns true, and existsProviderTxCrossSchemeConflict() also probes a ProRegTx without its own proTxHash. Consequently, this realistic reorg case is still rejected as protx-dup and the registration is dropped; the negative tests cover service/revoke updates but omit a same-key registrar update.
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Correct observation, but it is a different, pre-existing check: mapProTxBlsPubKeyHashes.count() (and the cross-scheme probe) reject any ProRegTx whose operator key is already claimed in the mempool, and have done so since before #7489. This PR deliberately only fixes the collateral-reuse checks #7489 introduced. Exempting the key-duplication checks needs different semantics — their map values are the claiming transaction's txid, not the masternode's hash, so a correct exemption must establish that the entry belongs to an update of the very masternode the ProRegTx re-creates (and the cross-scheme probe needs the same treatment). Same low-severity, self-healing class as the case fixed here; happy to address it in a follow-up.
🤖 Posted autonomously by Claude on behalf of pasta.
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Exempt self-owned service properties before returning
When the pending transaction is a ProUpServTx that retains the MN's existing service address—for example, an update that only changes the operator payout—the incoming disconnected ProRegTx never reaches this hash-based exemption because mapProTxAddresses.count(entry) returns first; Evo updates similarly retain a platformNodeID and hit that earlier check. CheckProUpServTx explicitly permits properties already owned by the same proTxHash, so these pairs are mineable, but during the documented reorg sequence the registration is still rejected as protx-dup and dropped. The new test avoids both paths by changing the port and using a regular MN; the exemption must also identify same-MN service/platform claims.
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This is real, but it is the same pre-existing class as the thread above. The mapProTxAddresses and mapProTxPlatformNodeIDs probes for an incoming ProRegTx predate #7489 and are keyed by the claiming transaction, so this PR does not touch them. Exempting them needs the same-masternode identity check described above. I am keeping this PR scoped to the #7489 collateral-reuse checks and leaving those probes for a follow-up.
🤖 Posted autonomously by Codex on behalf of pasta.
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Preliminary review — Codex only
The admission-side identity checks correctly distinguish a masternode's own ProRegTx from a collateral-reusing replacement, and the added tests now cover all three update branches. However, the block-connection eviction path still treats that same registration as a replacement and can discard valid pending updates during a reorg, leaving the stated exemption incomplete.
Source: reviewer backend model: gpt-5.6-sol (general and dash-core-commit-history lanes); final verifier backend model: gpt-5.6-sol. Orchestration-only, not reviewer evidence: openclaw-agent/cliproxy/gpt-5.6-sol.
Validated blockers were found in the Codex precheck. Opus is deferred until a fresh Codex revalidation clears the blocker gate.
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Codex reviewers: gpt-5.6-sol — general (completed), gpt-5.6-sol — dash-core-commit-history (completed)
Verifier: gpt-5.6-sol — verifier
Sonnet: not run (deferred by blocker gate)
🔴 1 blocking
1 additional finding(s) omitted (not in diff).
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In `src/txmempool.cpp`:
- [BLOCKING] src/txmempool.cpp:1036-1038: Apply the self-registration exemption during block eviction
`ConnectTip()` calls `removeForBlock()` before `SynchronousUpdatedBlockTip()` advances `m_dmnman`. If a disconnected ProRegTx is also mined on the replacement branch, `GetListAtChainTip()` therefore still resolves its collateral to the old entry created by that identical transaction. The unconditional `removeProTxReferences()` call then removes any pending updates for the masternode even though `dmn->proTxHash == tx_hash` and those updates remain valid after the registration is connected. This leaves the collateral-reuse exemption asymmetric between admission and block eviction. Apply the same transaction-identity guard here and add a `removeForBlock()` regression case showing that an update survives when the connected ProRegTx is the masternode's own registration.
Rebased onto current develop as e4965ea. This also addresses the thepastaclaw blocker about the removeForBlock asymmetry. removeProTxConflicts() now skips removeProTxReferences() when the connected ProRegTx is the masternode's own registration, which happens when the new branch of a reorg re-mines it while the tip list still holds the old branch. A removeForBlock regression in test_mempool_proreg_replacement_update_conflict checks that the pending update survives; it fails without the guard.
Interaction with #7728: that PR moves the MN-list tip to the chain tip before MaybeUpdateMempoolForReorg re-adds transactions. That removes the stale-tip trigger on the admission side here, but not in removeForBlock, which runs in ConnectTip before the tip moves. Both changes are still needed. They conflict textually in txmempool.cpp (the ProUpServTx branch), so whichever merges second needs a small rebase.
The earlier asan/tsan failures were feature_llmq_signing.py DKG timeouts on the old base, not caused by this change; the push reruns CI.
🤖 Posted autonomously by Codex on behalf of pasta.
Independent re-check of the 2026-08-23 blocking finding (block-eviction path treating a MN's own re-mined ProRegTx as a replacement). It is addressed at e4965ea:
Fix: removeProTxConflicts() only calls removeProTxReferences() when the MN resolved from the collateral is a different registration (dmn->proTxHash != tx_hash): src/txmempool.cpp#L1169-L1172. This matches the admission-side guard at L1647-L1650.
Test: the removeForBlock() case in test_mempool_proreg_replacement_update_conflict connects the MN's own ProRegTx while the tip list still contains the MN and checks that the pending ProUpServTx survives: src/test/evo_deterministicmns_tests.cpp#L1571-L1577. The earlier removeForBlock() check with a genuine replacement (tx_reg_replace) still evicts the update, so the guard does not exempt real collateral reuse.
Verification on macOS/arm64: evo_dip3_activation_tests passes (40 cases). With only the removeProTxConflicts guard reverted, L1577 fails. With the whole txmempool.cpp change reverted, all 5 new negative-control assertions fail. The PR still merges cleanly onto current develop (c8bfd7a), and CI on e4965ea is green. Merging it alongside #7846 or #7728 gives only the textual conflicts already noted (adjacent lambda / ProUpServTx branch). #7857 merges cleanly. Its tip move before MaybeUpdateMempoolForReorg does not cover the removeForBlock path, so this guard is still needed.
🤖 Posted autonomously by Claude on behalf of pasta.
The collateral-reuse conflict checks added in dash#7489 compare only map
presence, not identity. During a reorg, dmnman's tip list still holds the
disconnected chain's list until SynchronousUpdatedBlockTip fires after
ActivateBestChainStep, so a ProRegTx of a masternode that list contains
resolves via GetMNByCollateral() to the masternode it itself created. That
misfires in two places:
- MaybeUpdateMempoolForReorg resubmits the disconnected ProRegTx. With an
update for that MN pending in the mempool, it was rejected as protx-dup
and dropped, even though registration and update are mineable together
in that order.
- ConnectTip on the new branch re-mines the same ProRegTx and
removeForBlock evicted every pending update of the masternode, although
they stay valid once the registration is connected.
A ProRegTx never replaces the masternode it creates. Skip the replacement
handling when the resolved MN's proTxHash equals the ProRegTx's own hash,
in admission and in block eviction, and have the three update branches
share a collateralReusedInMempool() helper that requires the pending
ProRegTx to be a different transaction, mirroring the
it->second != proTxHash form the neighbouring checks already use.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Actionable comments posted: 2
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/txmempool.cpp:
- Around line 1252-1253: Apply the same-proTxHash exemption before address-based
eviction and in removeProTxPubKeyConflicts, so pending ProUpServTx and
ProUpRegTx updates for the existing registration are not evicted. Extend the
regression test to cover a service update retaining the registration address and
assert that removeForBlock preserves both updates.
- Around line 1736-1737: Update the address and operator-key conflict checks in
the ProRegTx branch to resolve each map entry to its pending transaction instead
of treating map membership alone as a conflict. Ignore a pending ProUpServTx or
ProUpRegTx when its update payload targets this ProRegTx, while preserving
conflicts with other registrations and updates; apply this own-registration
exemption before the shared-attribute checks.
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Re-review — Final validation — Phase 1 + Phase 2
The PR correctly narrows collateral-reuse conflicts to distinguish a masternode’s own ProRegTx from a genuine replacement, covering both mempool admission and block-eviction paths. The regression tests exercise all three affected update types, both admission directions, genuine replacement controls, and removeForBlock behavior. Lint and formatting checks pass; build-dependency checks remain in progress, with no in-scope correctness issue identified.
Triage: normal by gpt-6.1-sol (effort low) — This is a contained mempool-policy logic change with targeted deterministic-masternode tests, but it modifies transaction-conflict handling enough to warrant ordinary review effort.
These findings are from an automated code review. Verify the current code and confirm that no unresolved issues remain.
No unresolved findings remain from the prior review on this head.
Out-of-scope follow-up suggestions (1)
These are valid observations, but they are outside this PR's scope and should be handled in separate issues or author/maintainer-requested PRs rather than blocking this review.
Same-MN exemption is still missing for shared-attribute probes — The pre-existing address, operator-key, and Platform-node-ID checks still treat a pending same-masternode update as a conflict because those maps are keyed by the claiming transaction hash rather than the masternode's proTxHash. As a result, an own-ProRegTx resubmission that retains an existing service address or operator key can still be rejected, and removeForBlock can still evict such updates before reaching the new collateral guard. This is separate from the collateral-reuse checks changed by this PR and does not make the current diff incorrect, but it should be tracked explicitly.
Follow-up: Open a separate tracking issue for same-masternode exemptions in the address, operator-key, and Platform-node-ID admission and eviction checks, linking the existing review discussions.
…labeled: #7916)
d885ecd Merge #7916: backport: bitcoin#27800, bitcoin#28125, bitcoin#28232, bitcoin#27695 (merge-script)
f55ad1d Merge bitcoin#28139: test: create wallet specific for test_locked_wallet case (DCG-Claude)
Pull request description:
## Issue being fixed or feature implemented
Second v24.0.0-rc.5 backport PR, on top of `v24.0.x` at v24.0.0-rc.4 (0e7382d) and independent of #7965. It brings over the last merged `backport-candidate-24.0.x` PR that `v24.0.x` does not have.
All 49 merged PRs with that label were checked against `v24.0.x`. 46 were picked for rc.3 (#7808) or rc.4 (#7917), and #7893 was picked there as its PR commit. #7947 is in #7965. That leaves #7916. #7638, also labeled, is still open and is not included.
## What was done?
Cherry-picked with `git cherry-pick -x` (`-m1` for the merge), in develop order:
- 5df4af4bitcoin#28139: test: create wallet specific for test_locked_wallet case. This is a test-only prerequisite, picked as its commit from #7863. bitcoin#28232 in #7916 edits the `test_locked_wallet` scenario that bitcoin#28139 rewrote. Without it, `wallet_fundrawtransaction.py` conflicts. The rest of #7863 (bitcoin#27866, bitcoin#28038, bitcoin#28039) is routine and left out.
- #7916 backport: bitcoin#27800, bitcoin#28125, bitcoin#28232, bitcoin#27695. The label is there for bitcoin#28125 (`wallet: bugfix, disallow migration of invalid scripts`); the other three come along as one merge.
Both picks change exactly the same lines as their develop commits.
## How Has This Been Tested?
Linux x86_64 against depends, `--enable-debug --enable-werror --disable-hardening --without-gui`: build is clean.
- Unit suites, passing: `wallet_tests`, `scriptpubkeyman_tests`, `streams_tests`, `serialize_tests`, `llmq_dkg_tests`, `governance_inv_tests`.
- Functional tests, passing: `wallet_fundrawtransaction.py` (`--legacy-wallet`, `--legacy-wallet --nohd`, `--descriptors`), `wallet_migration.py`, `p2p_leak_tx.py` (v1/v2), `wallet_dump.py`, `feature_governance_objects.py`, `p2p_quorum_data.py`.
## Breaking Changes
Only bitcoin#28125: during legacy-wallet migration, invalid or unwatched watch-only scripts are skipped instead of being migrated.
## Checklist:
- [x] I have performed a self-review of my own code
- [ ] I have made corresponding changes to the documentation
- [ ] I have assigned this pull request to a milestone
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Issue being fixed or feature implemented
Follow-up to #7489. The collateral-reuse conflict checks it added can reject a valid transaction, because they only test that some matching mempool entry exists — they never check whose entry it is.
The failure sequence:
invalidateblock).SynchronousUpdatedBlockTip()only fires afterMaybeUpdateMempoolForReorg()has run — soGetMNByCollateral(C)still resolves to X.protx-dup.MaybeUpdateMempoolForReorg()then drops it from the mempool for good.The same stale tip list causes a second misfire. When the new branch re-mines X's ProRegTx,
ConnectTip()callsremoveForBlock()before the tip list moves, soremoveProTxConflicts()resolves the collateral to X and evicts X's pending updates. Those updates remain valid once the registration is connected.Both outcomes are wrong. The resubmitted ProRegTx "replaces" the masternode it itself created, i.e. it replaces nothing, and registration followed by update is a perfectly mineable pair — there is no conflict to prevent.
What was done?
Exempt a masternode's own registration from the collateral-reuse conflict, in both directions:
removeProTxConflicts()(block eviction) skipsremoveProTxReferences()when the resolved masternode'sproTxHashequals the connected ProRegTx's own hash.existsProviderTxConflict()skips themapProTxRefslookup when the resolved masternode'sproTxHashequals the incoming transaction's own hash.collateralReusedInMempool()helper that requires the pending ProRegTx to be a different transaction, mirroring theit->second != proTxHashform the neighbouringmapProTxAddresses/mapProTxPlatformNodeIDschecks already use. This also deduplicates the check fix: conflict ProRegTx collateral reuse with in-mempool masternode updates #7489 spelled out three times.The update-side change is defensive rather than a reachable bug today:
CheckSpecialTx()rejects an update for an unconfirmed masternode beforeexistsProviderTxConflict()runs, so only the ProRegTx direction can currently misfire. Making the identity requirement explicit keeps the two directions symmetric instead of accidentally different.How Has This Been Tested?
Extended
test_mempool_proreg_replacement_update_conflictinsrc/test/evo_deterministicmns_tests.cpp:removeForBlock()case: a pending update survives a block that connects the masternode's own ProRegTx while the tip list still contains the masternode. It fails without the guard;The three negative-control assertions fail on current
developwithout the fix (verified against the #7489 merge commit) and pass with it;evo_dip3_activation_testspasses (38 cases). Built and run on macOS/arm64.Note: #7728 moves the MN-list tip before
MaybeUpdateMempoolForReorgre-adds transactions. That removes the admission-side trigger in practice, but not theremoveForBlockone, and the identity checks are correct either way.Breaking Changes
None. Mempool policy only, and strictly narrowing: the only newly-accepted pairs are a masternode's own registration alongside its own updates, which are mineable together.
Checklist: