LLMQ: Bound signature share verification batches

[navidR]

Limit verification batches by the actual number of signature shares rather than the number of sessions. Add coverage for bounded, complete draining of a large session.

Upstream: Dash PR #7415.

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📥 Commits

Reviewing files that changed from the base of the PR and between 4f0c771 and 8366cc7.

📒 Files selected for processing (4)

• src/llmq/quorums_signing_shares.cpp
• src/llmq/quorums_signing_shares.h
• src/test/CMakeLists.txt
• src/test/quorums_signing_share_tests.cpp

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Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-08-30T14:57:31.408564Z	8366cc7	PR opened

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Status	Commit	Started (UTC)	Finished (UTC)
✅ Reviewed your PR	8366cc7	Aug 30, 2026 · 14:56	14:59

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User description

Limit verification batches by the actual number of signature shares rather than the number of sessions. Add coverage for bounded, complete draining of a large session.

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CodeAnt-AI Description

Bound signature-share verification batches by the number of shares

What Changed

• Verification now processes at most the configured number of actual signature shares, even when many shares belong to one session.
• Pending shares continue draining in bounded batches until all shares are processed.
• Added coverage for large sessions to confirm batches stay within the limit and no shares are skipped.

Impact

✅ Lower verification workload per batch
✅ Fewer expensive per-share verification fallbacks
✅ Complete processing of large signature-share queues

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CodeAnt Nitpicks

1 code suggestion

1. Duplicate pending shares do not increment sharesAdded, so many duplicates can be scanned and erased while holding cs, making collection unbounded despite maxShares.

Performance · src/llmq/quorums_signing_shares.cpp:614-619

[reubenyap]

I traced the new share-count bound through collection and verification, including already-known shares, banned peers, randomized peer iteration, quorum lookup, and subsequent queue draining. Only admitted shares increment the counter, and the continuation condition prevents a verification batch from exceeding 32 actual shares. The focused regression coverage and full CI matrix are green; I found no actionable defect.