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test: assumeutxo snapshot block CheckBlockIndex crash test

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Add a test for a CheckBlockIndex crash that would happen before previous
"assumeutxo: Get rid of faked nTx and nChainTx values" commit.

The crash was an assert failure in the (pindex->nChainTx == pindex->nTx +
prev_chain_tx) check that would previously happen if the snapshot block was
submitted after loading the snapshot and downloading a few blocks after the
snapshot. In that case ReceivedBlockTransactions() previously would overwrite
the nChainTx value of the submitted snapshot block with a fake value based on
the previous block, so the (pindex->nChainTx == pindex->nTx + prev_chain_tx)
check would later fail on the first block after the snapshot. This test was
originally posted by Martin Zumsande <mzumsande@gmail.com> in
https://github.com/bitcoin/bitcoin/pull/29370#issuecomment-1974096225

Co-authored-by: Martin Zumsande <mzumsande@gmail.com>
This commit is contained in:
Ryan Ofsky 2024-02-02 10:59:24 -05:00
parent 0391458d76
commit ef174e9ed2
1 changed files with 10 additions and 0 deletions
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10
test/functional/feature_assumeutxo.py
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@ -324,6 +324,16 @@ class AssumeutxoTest(BitcoinTestFramework):
self.log.info("Restarted node before snapshot validation completed, reloading...")
self.restart_node(1, extra_args=self.extra_args[1])
# Send snapshot block to n1 out of order. This makes the test less
# realistic because normally the snapshot block is one of the last
# blocks downloaded, but its useful to test because it triggers more
# corner cases in ReceivedBlockTransactions() and CheckBlockIndex()
# setting and testing nChainTx values, and it exposed previous bugs.
snapshot_hash = n0.getblockhash(SNAPSHOT_BASE_HEIGHT)
snapshot_block = n0.getblock(snapshot_hash, 0)
n1.submitblock(snapshot_block)
self.connect_nodes(0, 1)
self.log.info(f"Ensuring snapshot chain syncs to tip. ({FINAL_HEIGHT})")