[bug]: Fail to chain sync on `testnet3` & `mainnet` errors relating to: script witness item is larger than the max allowed size

[rsafier]

Background

Fail to chain sync on testnet3.
The node does show it is up to the tip of the chain , but remains unsynced due to errors

2022-10-09 18:42:39.886 [ERR] LNWL: Unable to process chain reorg: unable to get block 0000000000000032fcf519b61aad2b966348e3f2d27687b26277933cc9881965: readScript: script witness item is larger than the max allowed size [count 396669, max 11000]
....
2022-10-09 18:46:18.715 [ERR] LNWL: Unable to complete chain rescan: readScript: script witness item is larger than the max allowed size [count 396669, max 11000]
...

2022-10-09 21:36:23.272 [ERR] LNWL: Unable to process chain reorg: unable to get block 0000000000000014820a254fbcdccce582df2194014c1e3b3f5ecd9259fce663: readScript: script witness item is larger than the max allowed size [count 33970, max 11000]

Your environment

• 0.15.0-beta commit=v0.15.0-beta
• Linux ip-10-21-2-70 5.13.0-1031-aws #35~20.04.1-Ubuntu SMP Mon Jun 13 22:30:30 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
• backend bitcoind v23.0.0

Steps to reproduce

Unknown

Expected behaviour

"synced_to_chain": true

Actual behaviour

"synced_to_chain": false with following errors in logs:

2022-10-09 18:42:39.886 [ERR] LNWL: Unable to process chain reorg: unable to get block 0000000000000032fcf519b61aad2b966348e3f2d27687b26277933cc9881965: readScript: script witness item is larger than the max allowed size [count 396669, max 11000]
....
2022-10-09 18:46:18.715 [ERR] LNWL: Unable to complete chain rescan: readScript: script witness item is larger than the max allowed size [count 396669, max 11000]
...

2022-10-09 21:36:23.272 [ERR] LNWL: Unable to process chain reorg: unable to get block 0000000000000014820a254fbcdccce582df2194014c1e3b3f5ecd9259fce663: readScript: script witness item is larger than the max allowed size [count 33970, max 11000]

[RandyMcMillan]

😬

[benthecarman]

Looks like lnd/btcd has a bug in their taproot implementation. In BIP342:

Script size limit The maximum script size of 10000 bytes does not apply. Their size is only implicitly bounded by the block weight limit.[9]

I am surprised this wasn't caught by tests. Are they not using the static test vectors?

[HamishMacEwan]

Having this with LND Version v0.15.1 on mainnet:

2022-10-10 10:27:48.835 [INF] LTND: Waiting for chain backend to finish sync, start_height=757924
2022-10-10 10:27:49.535 [ERR] LNWL: Unable to complete chain rescan: readScript: script witness item is larger than the max allowed size [count 33970, max 11000]

[benthecarman]

Got the same error on mainnet:

2022-10-09 16:56:50.707 [ERR] LNWL: Unable to process chain reorg: unable to get block 0000000000000000000400a35a007e223a7fb8a622dc7b5aa5eaace6824291fb: readScript: script witness item is larger than the max allowed size [count 33970, max 11000]

[rsafier]

I also also seeing on mainnet v0.15.0:

2022-10-09 21:56:48.549 [ERR] LNWL: Unable to process chain reorg: unable to get block 0000000000000000000400a35a007e223a7fb8a622dc7b5aa5eaace6824291fb: readScript: script witness item is larger than the max allowed size [count 33970, max 11000]

[ExImpius]

Same

[fotongit]

Same here. Why it suddenly happened to all of us?

Answer: a transaction came in the Blockchain that LND was not able to manage, thus all nodes went down at the same block

[hieblmi]

See this on v0.15.1/mainnet

2022-10-09 21:56:55.488 [ERR] LNWL: Unable to process chain reorg: unable to get block 0000000000000000000400a35a007e223a7fb8a622dc7b5aa5eaace6824291fb: readScript: script witness item is larger than the max allowed size [count 33970, max 11000]

[benthecarman]

This seems to be the tx that can't be parsed

https://mempool.space/tx/7393096d97bfee8660f4100ffd61874d62f9a65de9fb6acf740c4c386990ef73

[hieblmi]

This seems to be the tx that can't be parsed

https://mempool.space/tx/7393096d97bfee8660f4100ffd61874d62f9a65de9fb6acf740c4c386990ef73

Posted about here: https://twitter.com/brqgoo/status/1579216353780957185

[bnonni]

Same here. Running on testnet. bitcoind v22.0, lnd v0.15.1.

2022-10-09 22:20:06.866 [INF] LTND: Waiting for chain backend to finish sync, start_height=2350195
2022-10-09 22:20:07.828 [INF] LNWL: Started rescan from block 0000000000000027e44f015d141df1aeff3794ac4b0b7303ca1039c6baa35a4c (height 2350075) for 0 addresses
2022-10-09 22:20:08.093 [ERR] LNWL: Unable to complete chain rescan: readScript: script witness item is larger than the max allowed size [count 396669, max 11000]

seeing this printed over and over in bitcoind debug.log

2022-10-09T22:30:27Z ThreadRPCServer method=getblockheader user=bitcoinrpc
2022-10-09T22:30:28Z ThreadRPCServer method=getblockchaininfo user=bitcoinrpc

[bnonni]

This seems to be the tx that can't be parsed
https://mempool.space/tx/7393096d97bfee8660f4100ffd61874d62f9a65de9fb6acf740c4c386990ef73

Posted about here: https://twitter.com/brqgoo/status/1579216353780957185

if this is a mainnet tx, why is it impacting nodes running on testnet?