min-emergency-msat requirement even with zero channels open

[miketwenty1]

Issue and Steps to Reproduce

getinfo output

~/.lightning$ lightning-cli getinfo
{
   "id": "033db47ac0c48fdcc94b7662852e740916d5ad79ee1bdebddd13bfeedc1dab3e04",
   "alias": "YELLOWWAFFLE",
   "color": "033db4",
   "num_peers": 1,
   "num_pending_channels": 0,
   "num_active_channels": 0,
   "num_inactive_channels": 1,
   "address": [],
   "binding": [
      {
         "type": "ipv6",
         "address": "::",
         "port": 9735
      },
      {
         "type": "ipv4",
         "address": "0.0.0.0",
         "port": 9735
      }
   ],
   "version": "v24.02.2",
   "blockheight": 842888,
   "network": "bitcoin",
   "fees_collected_msat": 0,
   "lightning-dir": "/home/ubuntu/.lightning/bitcoin",
   "our_features": {
      "init": "08a0800a8a59a1",
      "node": "88a0800a8a59a1",
      "channel": "",
      "invoice": "02000002024100"
   }
}

Steps to reproduce:

• Spin up 2 core LN nodes.
• send 250k sat utxo to 1 node.
• setup a channel for roughly 222k sats between them. (minus fees and forces me to keep a reserve 25k sat utxo)?
• make bolt 12 payments / offers but not enough to justify a utxo on the receivers side.
• mutual close.
• try withdraw addr amount -> get errors about min-emergency-msat try setting min-emergency-msat to 0 but needs to be over dust limit.
• set config to 546 and do a withdraw.
• pollute utxo set with dust.

Note:

• "num_inactive_channels": 1,

Might be related: (But I think this is when channels are still open)?

https://github.com/ElementsProject/lightning/issues/7131

[ddustin]

@ddustin tagging myself so I can find it again

[rustyrussell]

Wait 100 blocks, so it's fully settled. We don't know for sure that the channel will not get double-spent. We could relax this, I guess?