Setting `max_path_count` to `channel_manager.list_usable_channels().len()` fails to route full amount #3727

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MaxFangX opened this issue Apr 10, 2025 · 0 comments

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MaxFangX commented Apr 10, 2025 •

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For convenience, here's the scenario in #3685 which is fixed by #3707:

Alice -> Bob 200k and 300k sat channels

Bob -> Charlie 600k sat private channel

Send a MPP payment Alice -> Charlie of size 350k sats

If we amend this scenario so that:

Alice limits max_path_count to channel_manager.list_usable_channels().len() (i.e. 2)
Alice tries to send 450k sats instead of 350k sats

Then the regression test added in #3707 fails.

Repro here: https://github.com/lexe-app/rust-lightning/tree/max/repro-max-path-count-limit

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