`channel_full_cycle_0conf` is flaky

[tnull]

We currently see this relatively often flake in CI:

A splices in the splice-out payment from B
0256616a717dea24e1246b4ad51162d0515028b92e7148f65b12f31b59d798874d got event SpliceNegotiated { channel_id: b51f7d780b83153a63e210eac816ea451dd82a9639371cea3fa2a320610e36ce, user_channel_id: UserChannelId(118275649381199416725389733814081107355), counterparty_node_id: PublicKey(4f97b8dfe0fa8d2e293e2b3baac76d62895f1e7a347e6d68b49a53fa11c68d050a862052957ab79d9a6955c236a85ad5e258d75018e06369d9753822048e0c20), new_funding_txo: OutPoint { txid: 59cab840caca12f8d4da2678ba5c57dfd9a2dddaae373cf7742707b5b7b02b30, vout: 1 } }

thread 'channel_full_cycle_0conf' (15831) panicked at tests/common/mod.rs:1572:5:
node_b got unexpected event!: ChannelClosed { channel_id: b51f7d780b83153a63e210eac816ea451dd82a9639371cea3fa2a320610e36ce, user_channel_id: UserChannelId(19122878133562586607868066837770368363), counterparty_node_id: PublicKey(4d8798d7591bf3125bf648712eb9285051d06211d54a6b24e124ea7d716a615632722921c869572b9a15bb27ad6ca5a78b73ebcb903f4b6e4f0608bbeabadb8f), reason: Some(ProcessingError { err: "unknown splice funding txid" }) }
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    channel_full_cycle_0conf

https://github.com/lightningdevkit/ldk-node/actions/runs/29333216403/job/87085976363?pr=983

(cc @jkczyz)

[jkczyz]

Are LDK-level logs available? I'm wondering if some of the recent to-be-backported splicing fixes will prevent this.

[tankyleo]

Are LDK-level logs available? I'm wondering if some of the recent to-be-backported splicing fixes will prevent this.

I have tried quite a few times to reproduce on my own machine, and so far have not been successful. Perhaps the logs from the CI job are available somewhere not sure.

[jkczyz]

Looks like this might be the same problem identified in https://git.rust-bitcoin.org/lightningdevkit/rust-lightning/pulls/4790#issuecomment-425063 by this failing test: https://git.rust-bitcoin.org/jkczyz/rust-lightning/commit/2035d3afc850959c9e5351ecf932049025a16303. (cc: @wpaulino)