unable to broadcast close tx: unmatched backend error: -26: mempool min fee not met

[frbitten]

Hi
LND tried to close a channel and resulted in this error:
unable to broadcast close tx: unmatched backend error: -26: mempool min fee not met

The channel appears as "wating close" but the transaction does not exist in the mempool.
How do I regenerate this channel closing transaction?

lnd_1        | 2023-03-19 04:51:34.229 [INF] HSWC: ChannelLink(a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1): HTLC manager started, bandwidth=2276322522 mSAT
lnd_1        | 2023-03-19 04:51:34.229 [INF] HSWC: ChannelLink(a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1): attempting to re-synchronize
lnd_1        | 2023-03-19 04:51:34.266 [INF] HSWC: ChannelLink(a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1): received re-establishment message from remote side
lnd_1        | 2023-03-19 04:51:34.267 [INF] HSWC: ChannelLink(a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1): sending 2 updates to synchronize the state
lnd_1        | 2023-03-19 05:20:19.818 [INF] CNCT: ChannelArbitrator(a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1): go to chain for outgoing htlc 44b924d8ab487da1ee56174a4419f708cff27452bb3928305a988c30525ce075: timeout=781463, blocks_until_expiry=0, broadcast_delta=0
lnd_1        | 2023-03-19 05:20:19.832 [INF] CNCT: ChannelArbitrator(a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1): force closing chan
lnd_1        | 2023-03-19 05:20:19.843 [INF] HSWC: ChannelLink(a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1): stopping
lnd_1        | 2023-03-19 05:20:19.843 [INF] HSWC: ChannelLink(a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1): exited
lnd_1        | 2023-03-19 05:20:19.858 [INF] CNCT: Broadcasting force close transaction eb81956ed00dfefd41ff1dd932bf9955698bdb7a0196ea61372abc60c8c60733, ChannelPoint(a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1): (*wire.MsgTx)(0xc00e0d95c0)({
lnd_1        |    PreviousOutPoint: (wire.OutPoint) a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1,
lnd_1        |    PreviousOutPoint: (wire.OutPoint) a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1,
lnd_1        | 2023-03-19 05:20:19.893 [ERR] CNCT: ChannelArbitrator(a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1): unable to broadcast close tx: unmatched backend error: -26: mempool min fee not met, 1232 < 1235
lnd_1        | 2023-03-19 05:20:19.893 [ERR] CNCT: ChannelArbitrator(a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1): unable to advance state: unmatched backend error: -26: mempool min fee not met, 1232 < 1235
lnd_1        | 2023-03-19 07:31:18.278 [WRN] CHBU: Replacing disk backup for ChannelPoint(a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1) w/ newer version
lnd_1        | 2023-03-19 07:55:10.436 [WRN] CHBU: Replacing disk backup for ChannelPoint(a00dc88bda3bdbb3b7968664ca26d2b5a98e25a58e52449f115c1cb5c1cce759:1) w/ newer version
```

[guggero]

You need to increase the size of your bitcoind mempool, as it is full and is dropping transactions below a certain minimum fee. Use -maxmempool=xxx with a high enough value (e.g. 512 or more).