lnwallet: absolute fee floor sanity check #4211
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Crypt-iQ
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This enforces the _actualized_ fee rate of the commitment transaction, rather than the fee floor used for estimation. The new value of 250 sat/kw corresponds to 1 sat/byte, rather than 253 which is only rounded up during estimation to account for the fact that BOLT 3 rounds down to the nearest satoshi and that the vbyte fee estimation is lossy. Previously we would incorrectly fail to sign the next commitment even though the fee was technically high enough. Restarting with this commit should solve the issue as long as the channel hasn't already gone to chain.
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Fixes #4208
This enforces the actualized fee rate of the commitment transaction,
rather than the fee floor used for estimation. The new value of 250
sat/kw corresponds to 1 sat/byte, rather than 253 which is only rounded
up during estimation to account for the fact that BOLT 3 rounds down to
the nearest satoshi and that the vbyte fee estimation is lossy.
This check was added as part of #3821 to catch any bugs in the new
anchor commitment format. The bug is not present in any official
release of lnd, but does affect master, 0.10.0-beta.rc1, and
0.10.0-beta.rc2.
For affected users, restarting with this commit should return the channel to
normal operation unless any pending htlcs have already timed out and
caused the channel to go to chain.