fix: exempt a MN's own ProRegTx from collateral-reuse mempool conflicts - #7638
fix: exempt a MN's own ProRegTx from collateral-reuse mempool conflicts#7638PastaPastaPasta wants to merge 1 commit into
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Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review. WalkthroughMempool masternode conflict detection now uses a shared collateral-reuse check. The check excludes a live masternode’s own registration. Registration, service-update, registrar-update, and revoke-update paths use this check. Deterministic tests cover replacement registrations that conflict with pending registrar and revocation updates, while confirming valid original transaction combinations remain non-conflicting. Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This narrowly allows a masternode’s own registration and updates to coexist in the mempool while preserving conflicts with different transactions; no actionable merge-blocking risk remains after normal checks and review. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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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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src/test/evo_deterministicmns_tests.cppsrc/txmempool.cpp
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| if (auto dmn = m_dmnman.GetListAtChainTip().GetMNByCollateral(proTx.collateralOutpoint); | ||
| dmn && dmn->proTxHash != tx_hash && mapProTxRefs.count(dmn->proTxHash)) { |
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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.
AGENTS.md reference: AGENTS.md:L193-L211
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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.
The collateral-reuse conflict checks added in dash#7489 compare only map presence, not identity. While a reorg is being processed, dmnman's tip list is not yet rolled back (SynchronousUpdatedBlockTip fires after MaybeUpdateMempoolForReorg), so a disconnected ProRegTx being resubmitted still resolves via GetMNByCollateral() to the masternode it itself created. With an update for that MN pending in the mempool, the resubmission was rejected as protx-dup and dropped for good, even though registration and update are mineable together in that order. Treat the masternode's own registration (same hash) as not-a-replacement in both directions: the ProRegTx branch skips the mapProTxRefs lookup when the resolved MN's proTxHash equals the incoming tx hash, and the three update branches now 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>
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| if (auto dmn = m_dmnman.GetListAtChainTip().GetMNByCollateral(proTx.collateralOutpoint); | ||
| dmn && dmn->proTxHash != tx_hash && mapProTxRefs.count(dmn->proTxHash)) { |
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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.
AGENTS.md reference: AGENTS.md:L198-L211
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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.
Review provenance
- 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.
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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.That rejection is 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:
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: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.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: