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fuzz: add subtest for re-downloading a previously pruned block

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This imitates the use of the getblockfrompeer rpc.
Note that currently pruning is limited to blocks in the active chain.

Co-authored-by: Martin Zumsande <mzumsande@gmail.com>
This commit is contained in:
Eugene Siegel
2025-12-08 18:27:04 -05:00
committed by Martin Zumsande
parent 45f5b2dac3
commit db2d39f642
1 changed files with 19 additions and 0 deletions
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19
src/test/fuzz/block_index_tree.cpp
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@@ -50,6 +50,8 @@ FUZZ_TARGET(block_index_tree, .init = initialize_block_index_tree)
blocks.push_back(genesis);
bool abort_run{false};
std::vector<CBlockIndex*> pruned_blocks;
LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 1000)
{
if (abort_run) break;
@@ -171,7 +173,24 @@ FUZZ_TARGET(block_index_tree, .init = initialize_block_index_tree)
blockman.m_blocks_unlinked.erase(_it);
}
}
pruned_blocks.push_back(prune_block);
}
},
[&] {
// Download a previously pruned block
LOCK(cs_main);
size_t num_pruned = pruned_blocks.size();
if (num_pruned == 0) return;
size_t i = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, num_pruned - 1);
CBlockIndex* index = pruned_blocks[i];
assert(!(index->nStatus & BLOCK_HAVE_DATA));
CBlock block;
block.vtx = std::vector<CTransactionRef>(index->nTx); // Set the number of tx to the prior value.
FlatFilePos pos(0, fuzzed_data_provider.ConsumeIntegralInRange<int>(1, 1000));
chainman.ReceivedBlockTransactions(block, index, pos);
assert(index->nStatus & BLOCK_VALID_TRANSACTIONS);
assert(index->nStatus & BLOCK_HAVE_DATA);
pruned_blocks.erase(pruned_blocks.begin() + i);
});
}
if (!abort_run) {