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fuzz: add chanmon stuck HTLC invariant #4601

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fuzz: add chanmon stuck HTLC invariant #4601

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18 changes: 18 additions & 0 deletions fuzz/src/chanmon_consistency.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2939,6 +2939,24 @@ pub fn do_test<Out: Output + MaybeSend + MaybeSync>(data: &[u8], out: Out) {
);
}

// All HTLCs should have been claimed or failed once we reach quiescence.
for (idx, node) in nodes.iter().enumerate() {
for chan in node.list_channels() {
assert!(
chan.pending_inbound_htlcs.is_empty()
&& chan.pending_outbound_htlcs.is_empty(),
"Node {} channel {:?} has stuck HTLCs after settling all state: \
{} inbound {:?}, {} outbound {:?}",
idx,
chan.channel_id,
chan.pending_inbound_htlcs.len(),
chan.pending_inbound_htlcs,
chan.pending_outbound_htlcs.len(),
chan.pending_outbound_htlcs
);
}
}

// Finally, make sure that at least one end of each channel can make a substantial payment
for &chan_id in &chan_ab_ids {
assert!(
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