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Fix Pruned Node Loss Sync Issue. #8428

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ziggie1984
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@ziggie1984 ziggie1984 commented Jan 25, 2024

Change Description

Fixes for #8250 happened in btcwallet (btcsuite/btcwallet#903), this just bumps the version.

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@yyforyongyu
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Curious why the blockcache didn't help, hmm

@ziggie1984
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ziggie1984 commented Jan 25, 2024

So we did not have the block in the cache and it failed to get requested, here is the stack trace from one of those deadlocks I analysed:

goroutine 3076998 [select, 863 minutes]:
github.com/btcsuite/btcwallet/chain.(*BitcoindConn).GetBlock(0xc00027ba20, 0xc014ea3a40)
	/home/cotto/go/pkg/mod/github.com/btcsuite/btcwallet@v0.16.10-0.20231129183218-5df09dd43358/chain/bitcoind_conn.go:479 +0x1f0
github.com/btcsuite/btcwallet/chain.(*BitcoindClient).GetBlock(0xc00dc0e7a0?, 0x0?)
	/home/cotto/go/pkg/mod/github.com/btcsuite/btcwallet@v0.16.10-0.20231129183218-5df09dd43358/chain/bitcoind_client.go:144 +0x1d
github.com/lightningnetwork/lnd/blockcache.(*BlockCache).GetBlock(0xc0062f4070, 0xc014ea3a40, 0xc005adeec0)
	/home/cotto/IdeaProjects/lnd/blockcache/blockcache.go:55 +0x246
github.com/lightningnetwork/lnd/lnwallet/btcwallet.(*BtcWallet).GetBlock(0x0?, 0x48403c?)
	/home/cotto/IdeaProjects/lnd/lnwallet/btcwallet/blockchain.go:139 +0x1ff
github.com/lightningnetwork/lnd/routing.(*ChannelRouter).fetchFundingTx(0xc0000d88c0, 0xc00dc0e6f4)
	/home/cotto/IdeaProjects/lnd/routing/router.go:1810 +0x66
github.com/lightningnetwork/lnd/routing.(*ChannelRouter).fetchFundingTxWrapper.func1()
	/home/cotto/IdeaProjects/lnd/routing/router.go:1774 +0x46
created by github.com/lightningnetwork/lnd/routing.(*ChannelRouter).fetchFundingTxWrapper
	/home/cotto/IdeaProjects/lnd/routing/router.go:1773 +0xf1

@ziggie1984 ziggie1984 force-pushed the prune-node-deadlock-blocksync branch from 8f147a9 to 83c9c8f Compare January 25, 2024 14:41
@saubyk saubyk added this to the v0.17.4 milestone Jan 26, 2024
@saubyk saubyk linked an issue Jan 26, 2024 that may be closed by this pull request
@Roasbeef
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Can be rebased now!

@rockstardev
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Excited to push this to everyone using BTCPay Server once ready. Thanks for your work everyone!

@Roasbeef
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@rockstardev the dependent PR has been merged. Once this is rebased and passes review+CI, we'll fold it into v0.17.4 rc1.

@rockstardev
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Perfect, I have a few merchants waiting for this, so will provide them with rc1 once you tag it and I'll ask them to test.

@ziggie1984 ziggie1984 force-pushed the prune-node-deadlock-blocksync branch from 83c9c8f to f42e9c4 Compare January 27, 2024 10:33
@ziggie1984 ziggie1984 marked this pull request as ready for review January 27, 2024 10:34
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@saubyk saubyk left a comment

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Ack

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@yyforyongyu yyforyongyu left a comment

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Need to fix the linter re go mod on subdirs, otherwise it's good to go ⛵

Update the btcwallet version to fix a case where fetching of
already pruned blocks from our peers was not garbage collected
when the request failed.
@ziggie1984 ziggie1984 force-pushed the prune-node-deadlock-blocksync branch from f42e9c4 to 141a30d Compare January 29, 2024 10:23
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LGTM 🎉

@yyforyongyu yyforyongyu merged commit b76d3e6 into lightningnetwork:master Jan 29, 2024
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[bug]: LND frequently loses sync to chain with pruned backend
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