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Merge bitcoin/bitcoin#33300: fuzz: compact block harness

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c8d688f41c fuzz: send blocktxn messages in cmpctblock harness (Eugene Siegel)
d0333bfe99 fuzz: send compact blocks in cmpctblock harness (Eugene Siegel)
3c58efe2ac fuzz: mine blocks and send headers for them in cmpctblock harness (Eugene Siegel)
651622432d fuzz: create and send transactions in cmpctblock harness (Eugene Siegel)
8c9a3fd0e8 net, fuzz: move CMPCTBLOCK_VERSION to header, use in cmpctblock harness (Eugene Siegel)
6cd480f62f fuzz: initial compact block fuzz harness (Eugene Siegel)

Pull request description:

  Adds a fuzz harness for testing compact blocks, similar to `process_message(s)`. It can make (in)valid blocks, reconstruct blocks with in-mempool txns, mark peers as HB, and has high stability in AFL++ (~98-99%).

  Coverage is [here](https://crypt-iq.github.io/fuzz_coverage_reports/cmpctblock-aflpp-inputs-09182025/) (look in `src/blockencodings.cpp`, relevant compact block bits in `src/net_processing.cpp`).

ACKs for top commit:
  instagibbs:
    ACK c8d688f41c
  marcofleon:
    ACK c8d688f41c

Tree-SHA512: d904066921211b32eb75c9602908929f46ecd25482c518db36ed9f30e012b350b38a2df382f0faa21decd43bc2cabcc859193207da34be76010a32df1d9ac5c8
This commit is contained in:
merge-script
2026-05-04 22:28:54 +01:00
parent 4bf1701f58 c8d688f41c
commit c89c8ddbb3
6 changed files with 515 additions and 10 deletions
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2
src/net_processing.cpp
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@@ -195,8 +195,6 @@ static constexpr double MAX_ADDR_RATE_PER_SECOND{0.1};
* based increments won't go above this, but the MAX_ADDR_TO_SEND increment following GETADDR
* is exempt from this limit). */
static constexpr size_t MAX_ADDR_PROCESSING_TOKEN_BUCKET{MAX_ADDR_TO_SEND};
/** The compactblocks version we support. See BIP 152. */
static constexpr uint64_t CMPCTBLOCKS_VERSION{2};
/** For private broadcast, send a transaction to this many peers. */
static constexpr size_t NUM_PRIVATE_BROADCAST_PER_TX{3};
/** Private broadcast connections must complete within this time. Disconnect the peer if it takes longer. */