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commitment transaction dips peer below chan reserve #6940

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philipp1992 opened this issue Sep 23, 2022 · 6 comments
Closed

commitment transaction dips peer below chan reserve #6940

philipp1992 opened this issue Sep 23, 2022 · 6 comments

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@philipp1992
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Background

Im running 3 LND instances

lnd-1--chan--lnd-2--chan--lnd-3

When creating a hodlinvoice on 3, i get the following error:
[DBG] LNWL: ChannelPoint(606249f2b0cad6976cbb120d242dfc90c327648dfccb5b3e6275e819b5366b89:0): May add outgoing htlc rejected: commitment transaction dips peer below chan reserve

The channels have pending / stuck HTLC, but the amount of those is not as high as it would cause the above error.

From lnd-2

LND-2:/# lncli --rpcserver=localhost:10000 --macaroonpath=/data/chain/bitcoin/testnet/admin.macaroon --tlscertpath=/data/tls.cert listchannels --peer $LND1 |grep unsett
"unsettled_balance": "79543",
"unsettled_balance": "59172",

LND-2:/# lncli --rpcserver=localhost:10000 --macaroonpath=/data/chain/bitcoin/testnet/admin.macaroon --tlscertpath=/data/tls.cert listchannels --peer $LND3 |grep unsett
"unsettled_balance": "0",
"unsettled_balance": "115114",

Your environment

  • version of lnd 0.14.2
  • which operating system (uname -a on *Nix) ubuntu
  • version of btcd, bitcoind, or other backend bitcoind

lnd-2 listchannels lnd-1


{
    "channels": [
        {
            "active": true,
            "remote_pubkey": "02d075fc84c5e79a972cae66221316c71347b902283f30eee2a190c857b46241bf",
            "channel_point": "2afe4eb76bed3ca8f6427474cd82f2d087f5dc5ed06caa2b2798781e6cd14168:1",
            "chan_id": "2514911846702448641",
            "capacity": "15000000",
            "local_balance": "477014",
            "remote_balance": "14465732",
            "commit_fee": "720",
            "commit_weight": "2836",
            "fee_per_kw": "253",
            "unsettled_balance": "55874",
            "total_satoshis_sent": "158713",
            "total_satoshis_received": "691601",
            "num_updates": "957",
            "pending_htlcs": [
                {
                    "incoming": false,
                    "amount": "6303",
                    "hash_lock": "0d338a628bda87f0dcd50916d2fa19b64187204ae5a649e9c714fcef3c3b2679",
                    "expiration_height": 2347737,
                    "htlc_index": "152",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "401"
                },
                {
                    "incoming": false,
                    "amount": "7341",
                    "hash_lock": "d819f717ceca53726cf8c361144a95952cf0e7d9fccf708df0e8a08e81486e40",
                    "expiration_height": 2347737,
                    "htlc_index": "153",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "402"
                },
                {
                    "incoming": false,
                    "amount": "6092",
                    "hash_lock": "de73f2bd458374c0ae96431e11f4e097478ac5fed3198cb75a2843f9eb7ac6bb",
                    "expiration_height": 2347737,
                    "htlc_index": "154",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "404"
                },
                {
                    "incoming": false,
                    "amount": "676",
                    "hash_lock": "57df6c1ccc63716d457969e45563bf5b33c135124bf2fac777c4fbfe52597a2f",
                    "expiration_height": 2347737,
                    "htlc_index": "155",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "405"
                },
                {
                    "incoming": false,
                    "amount": "6793",
                    "hash_lock": "0146ccef3f79f4bf3bd8a4c8865d9b49543d0ec31ac80c6c9a4410a90873e0b6",
                    "expiration_height": 2347737,
                    "htlc_index": "156",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "406"
                },
                {
                    "incoming": false,
                    "amount": "7334",
                    "hash_lock": "632f3fa7a79306a15a34bac02b9951619f8f2f94df3810438d0532402d4fd1b5",
                    "expiration_height": 2347737,
                    "htlc_index": "157",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "407"
                },
                {
                    "incoming": false,
                    "amount": "817",
                    "hash_lock": "b97808c9ad0f488e885946328614e94d73bb8cc67718a75754f25774c50d1b64",
                    "expiration_height": 2347737,
                    "htlc_index": "158",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "408"
                },
                {
                    "incoming": false,
                    "amount": "6109",
                    "hash_lock": "8a716be1037a352c17dd50bb453b7758c6494dc5af3d1e3303fcf5be22d0cf22",
                    "expiration_height": 2347737,
                    "htlc_index": "159",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "410"
                },
                {
                    "incoming": false,
                    "amount": "7060",
                    "hash_lock": "00704ed4d70b7a630b6d947abcb492507333838906743a888edbd4f2786ed8da",
                    "expiration_height": 2347738,
                    "htlc_index": "160",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "413"
                },
                {
                    "incoming": false,
                    "amount": "7349",
                    "hash_lock": "de8d909861b4f5cd0115476b8c3150e306dff31c75c8a1c13081eb730784beac",
                    "expiration_height": 2347740,
                    "htlc_index": "161",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "416"
                }
            ],
            "csv_delay": 3,
            "private": false,
            "initiator": false,
            "chan_status_flags": "ChanStatusDefault",
            "local_chan_reserve_sat": "150000",
            "remote_chan_reserve_sat": "150000",
            "static_remote_key": false,
            "commitment_type": "ANCHORS",
            "lifetime": "5447240",
            "uptime": "5447006",
            "close_address": "",
            "push_amount_sat": "0",
            "thaw_height": 0,
            "local_constraints": {
                "csv_delay": 3,
                "chan_reserve_sat": "150000",
                "dust_limit_sat": "354",
                "max_pending_amt_msat": "14850000000",
                "min_htlc_msat": "1",
                "max_accepted_htlcs": 483
            },
            "remote_constraints": {
                "csv_delay": 3,
                "chan_reserve_sat": "150000",
                "dust_limit_sat": "354",
                "max_pending_amt_msat": "14850000000",
                "min_htlc_msat": "1",
                "max_accepted_htlcs": 483
            }
        },
        {
            "active": true,
            "remote_pubkey": "02d075fc84c5e79a972cae66221316c71347b902283f30eee2a190c857b46241bf",
            "channel_point": "2e718abe5b65ae5b31d32c15cd8bfd3c39e1313700642d518142726b0af745eb:1",
            "chan_id": "2514906349145358337",
            "capacity": "15000000",
            "local_balance": "14633771",
            "remote_balance": "307081",
            "commit_fee": "1094",
            "commit_weight": "3008",
            "fee_per_kw": "253",
            "unsettled_balance": "57725",
            "total_satoshis_sent": "307081",
            "total_satoshis_received": "0",
            "num_updates": "472",
            "pending_htlcs": [
                {
                    "incoming": false,
                    "amount": "6457",
                    "hash_lock": "c93d3fe69c0f116ae4207e38a3f3dbe756d3f544e617b7c5f081b859559b1aeb",
                    "expiration_height": 2347735,
                    "htlc_index": "244",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "391"
                },
                {
                    "incoming": false,
                    "amount": "7334",
                    "hash_lock": "820d579a2ad1200374cffd0488691220ab9430d8b2d511446f5e334c2d8876b5",
                    "expiration_height": 2347735,
                    "htlc_index": "245",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "392"
                },
                {
                    "incoming": false,
                    "amount": "6937",
                    "hash_lock": "20e1e1735412ffb79f0de859a38022f6298aa953536fbb549afbf51688a3a8d6",
                    "expiration_height": 2347737,
                    "htlc_index": "251",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "403"
                },
                {
                    "incoming": false,
                    "amount": "7349",
                    "hash_lock": "5ff50c2323383fce2be50ad2988abc4dc3dd99eaff41f04283069ce03aeef199",
                    "expiration_height": 2347737,
                    "htlc_index": "252",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "409"
                },
                {
                    "incoming": false,
                    "amount": "6084",
                    "hash_lock": "bbfb7ea8e650d9e53005e18a633c775453a9708b6d364dc389e1dbdeb4816850",
                    "expiration_height": 2347738,
                    "htlc_index": "253",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "411"
                },
                {
                    "incoming": false,
                    "amount": "7334",
                    "hash_lock": "8040c1a890efb6073cc584571018337ad4ba3f80d69d4a687a871fa3a0e87446",
                    "expiration_height": 2347738,
                    "htlc_index": "254",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "412"
                },
                {
                    "incoming": false,
                    "amount": "6003",
                    "hash_lock": "f823f49db1671c4cef35c99551a7eb4aba3656ebd5103d72c516f037c62014de",
                    "expiration_height": 2347740,
                    "htlc_index": "255",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "414"
                },
                {
                    "incoming": false,
                    "amount": "331",
                    "hash_lock": "3f2d207251c2a0ea04ca6b07f1877c26d0b07bfbf43cd6eb11a3dfbd74e7393d",
                    "expiration_height": 2347740,
                    "htlc_index": "256",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "415"
                },
                {
                    "incoming": false,
                    "amount": "7099",
                    "hash_lock": "63debdabfd84228799716da9ed152d06a33245b084e4dc3962361e7b1e9a73e4",
                    "expiration_height": 2347740,
                    "htlc_index": "257",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "417"
                },
                {
                    "incoming": false,
                    "amount": "891",
                    "hash_lock": "07c177ea46fd40989a7dd762eaf392ba712c71048cfcb23e4ebc96a84f0ebe0b",
                    "expiration_height": 2347740,
                    "htlc_index": "258",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "418"
                },
                {
                    "incoming": false,
                    "amount": "640",
                    "hash_lock": "ba6f7dc3968aee39dde273f3bf5222727e0bd2191313acc1c459f9c347d29d80",
                    "expiration_height": 2347740,
                    "htlc_index": "259",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "419"
                },
                {
                    "incoming": false,
                    "amount": "1266",
                    "hash_lock": "e7366d3ccfa29e16ab211eded54fbdf3d6fccf66eeb6b3c20e5b60a31656fc74",
                    "expiration_height": 2347744,
                    "htlc_index": "260",
                    "forwarding_channel": "2514911846702514177",
                    "forwarding_htlc_index": "420"
                }
            ],
            "csv_delay": 3,
            "private": false,
            "initiator": true,
            "chan_status_flags": "ChanStatusDefault",
            "local_chan_reserve_sat": "150000",
            "remote_chan_reserve_sat": "150000",
            "static_remote_key": false,
            "commitment_type": "ANCHORS",
            "lifetime": "5449234",
            "uptime": "5449000",
            "close_address": "",
            "push_amount_sat": "0",
            "thaw_height": 0,
            "local_constraints": {
                "csv_delay": 3,
                "chan_reserve_sat": "150000",
                "dust_limit_sat": "354",
                "max_pending_amt_msat": "14850000000",
                "min_htlc_msat": "1",
                "max_accepted_htlcs": 483
            },
            "remote_constraints": {
                "csv_delay": 3,
                "chan_reserve_sat": "150000",
                "dust_limit_sat": "354",
                "max_pending_amt_msat": "14850000000",
                "min_htlc_msat": "1",
                "max_accepted_htlcs": 483
            }
        }
    ]
}

lnd2 listchannels lnd-3


{
    "channels": [
        {
            "active": true,
            "remote_pubkey": "0245d3a17856831ff07e70e1963cb89ec545b5be7cdeccf311a736bb2e2e25ee13",
            "channel_point": "606249f2b0cad6976cbb120d242dfc90c327648dfccb5b3e6275e819b5366b89:0",
            "chan_id": "2581288264158347264",
            "capacity": "15000000",
            "local_balance": "14879772",
            "remote_balance": "119284",
            "commit_fee": "284",
            "commit_weight": "1116",
            "fee_per_kw": "253",
            "unsettled_balance": "0",
            "total_satoshis_sent": "119284",
            "total_satoshis_received": "0",
            "num_updates": "54",
            "pending_htlcs": [
            ],
            "csv_delay": 3,
            "private": false,
            "initiator": true,
            "chan_status_flags": "ChanStatusDefault",
            "local_chan_reserve_sat": "150000",
            "remote_chan_reserve_sat": "150000",
            "static_remote_key": false,
            "commitment_type": "ANCHORS",
            "lifetime": "21231",
            "uptime": "21231",
            "close_address": "",
            "push_amount_sat": "0",
            "thaw_height": 0,
            "local_constraints": {
                "csv_delay": 3,
                "chan_reserve_sat": "150000",
                "dust_limit_sat": "354",
                "max_pending_amt_msat": "14850000000",
                "min_htlc_msat": "1",
                "max_accepted_htlcs": 483
            },
            "remote_constraints": {
                "csv_delay": 3,
                "chan_reserve_sat": "150000",
                "dust_limit_sat": "354",
                "max_pending_amt_msat": "14850000000",
                "min_htlc_msat": "1",
                "max_accepted_htlcs": 483
            }
        },
        {
            "active": true,
            "remote_pubkey": "0245d3a17856831ff07e70e1963cb89ec545b5be7cdeccf311a736bb2e2e25ee13",
            "channel_point": "2d9b5dbb8fccfe069c575916cf1dbaa9b951be92504c241289d4fa1802d2f4c2:1",
            "chan_id": "2514911846702514177",
            "capacity": "15000000",
            "local_balance": "217087",
            "remote_balance": "14667433",
            "commit_fee": "1531",
            "commit_weight": "4728",
            "fee_per_kw": "253",
            "unsettled_balance": "113621",
            "total_satoshis_sent": "228820",
            "total_satoshis_received": "445907",
            "num_updates": "867",
            "pending_htlcs": [
                {
                    "incoming": true,
                    "amount": "6458",
                    "hash_lock": "c93d3fe69c0f116ae4207e38a3f3dbe756d3f544e617b7c5f081b859559b1aeb",
                    "expiration_height": 2347753,
                    "htlc_index": "391",
                    "forwarding_channel": "2514906349145358337",
                    "forwarding_htlc_index": "244"
                },
                {
                    "incoming": true,
                    "amount": "7335",
                    "hash_lock": "820d579a2ad1200374cffd0488691220ab9430d8b2d511446f5e334c2d8876b5",
                    "expiration_height": 2347753,
                    "htlc_index": "392",
                    "forwarding_channel": "2514906349145358337",
                    "forwarding_htlc_index": "245"
                },
                {
                    "incoming": true,
                    "amount": "6304",
                    "hash_lock": "0d338a628bda87f0dcd50916d2fa19b64187204ae5a649e9c714fcef3c3b2679",
                    "expiration_height": 2347755,
                    "htlc_index": "401",
                    "forwarding_channel": "2514911846702448641",
                    "forwarding_htlc_index": "152"
                },
                {
                    "incoming": true,
                    "amount": "7342",
                    "hash_lock": "d819f717ceca53726cf8c361144a95952cf0e7d9fccf708df0e8a08e81486e40",
                    "expiration_height": 2347755,
                    "htlc_index": "402",
                    "forwarding_channel": "2514911846702448641",
                    "forwarding_htlc_index": "153"
                },
                {
                    "incoming": true,
                    "amount": "6938",
                    "hash_lock": "20e1e1735412ffb79f0de859a38022f6298aa953536fbb549afbf51688a3a8d6",
                    "expiration_height": 2347755,
                    "htlc_index": "403",
                    "forwarding_channel": "2514906349145358337",
                    "forwarding_htlc_index": "251"
                },
                {
                    "incoming": true,
                    "amount": "6093",
                    "hash_lock": "de73f2bd458374c0ae96431e11f4e097478ac5fed3198cb75a2843f9eb7ac6bb",
                    "expiration_height": 2347755,
                    "htlc_index": "404",
                    "forwarding_channel": "2514911846702448641",
                    "forwarding_htlc_index": "154"
                },
                {
                    "incoming": true,
                    "amount": "677",
                    "hash_lock": "57df6c1ccc63716d457969e45563bf5b33c135124bf2fac777c4fbfe52597a2f",
                    "expiration_height": 2347755,
                    "htlc_index": "405",
                    "forwarding_channel": "2514911846702448641",
                    "forwarding_htlc_index": "155"
                },
                {
                    "incoming": true,
                    "amount": "6794",
                    "hash_lock": "0146ccef3f79f4bf3bd8a4c8865d9b49543d0ec31ac80c6c9a4410a90873e0b6",
                    "expiration_height": 2347755,
                    "htlc_index": "406",
                    "forwarding_channel": "2514911846702448641",
                    "forwarding_htlc_index": "156"
                },
                {
                    "incoming": true,
                    "amount": "7335",
                    "hash_lock": "632f3fa7a79306a15a34bac02b9951619f8f2f94df3810438d0532402d4fd1b5",
                    "expiration_height": 2347755,
                    "htlc_index": "407",
                    "forwarding_channel": "2514911846702448641",
                    "forwarding_htlc_index": "157"
                },
                {
                    "incoming": true,
                    "amount": "818",
                    "hash_lock": "b97808c9ad0f488e885946328614e94d73bb8cc67718a75754f25774c50d1b64",
                    "expiration_height": 2347755,
                    "htlc_index": "408",
                    "forwarding_channel": "2514911846702448641",
                    "forwarding_htlc_index": "158"
                },
                {
                    "incoming": true,
                    "amount": "7350",
                    "hash_lock": "5ff50c2323383fce2be50ad2988abc4dc3dd99eaff41f04283069ce03aeef199",
                    "expiration_height": 2347755,
                    "htlc_index": "409",
                    "forwarding_channel": "2514906349145358337",
                    "forwarding_htlc_index": "252"
                },
                {
                    "incoming": true,
                    "amount": "6110",
                    "hash_lock": "8a716be1037a352c17dd50bb453b7758c6494dc5af3d1e3303fcf5be22d0cf22",
                    "expiration_height": 2347755,
                    "htlc_index": "410",
                    "forwarding_channel": "2514911846702448641",
                    "forwarding_htlc_index": "159"
                },
                {
                    "incoming": true,
                    "amount": "6085",
                    "hash_lock": "bbfb7ea8e650d9e53005e18a633c775453a9708b6d364dc389e1dbdeb4816850",
                    "expiration_height": 2347756,
                    "htlc_index": "411",
                    "forwarding_channel": "2514906349145358337",
                    "forwarding_htlc_index": "253"
                },
                {
                    "incoming": true,
                    "amount": "7335",
                    "hash_lock": "8040c1a890efb6073cc584571018337ad4ba3f80d69d4a687a871fa3a0e87446",
                    "expiration_height": 2347756,
                    "htlc_index": "412",
                    "forwarding_channel": "2514906349145358337",
                    "forwarding_htlc_index": "254"
                },
                {
                    "incoming": true,
                    "amount": "7061",
                    "hash_lock": "00704ed4d70b7a630b6d947abcb492507333838906743a888edbd4f2786ed8da",
                    "expiration_height": 2347756,
                    "htlc_index": "413",
                    "forwarding_channel": "2514911846702448641",
                    "forwarding_htlc_index": "160"
                },
                {
                    "incoming": true,
                    "amount": "6004",
                    "hash_lock": "f823f49db1671c4cef35c99551a7eb4aba3656ebd5103d72c516f037c62014de",
                    "expiration_height": 2347758,
                    "htlc_index": "414",
                    "forwarding_channel": "2514906349145358337",
                    "forwarding_htlc_index": "255"
                },
                {
                    "incoming": true,
                    "amount": "332",
                    "hash_lock": "3f2d207251c2a0ea04ca6b07f1877c26d0b07bfbf43cd6eb11a3dfbd74e7393d",
                    "expiration_height": 2347758,
                    "htlc_index": "415",
                    "forwarding_channel": "2514906349145358337",
                    "forwarding_htlc_index": "256"
                },
                {
                    "incoming": true,
                    "amount": "7350",
                    "hash_lock": "de8d909861b4f5cd0115476b8c3150e306dff31c75c8a1c13081eb730784beac",
                    "expiration_height": 2347758,
                    "htlc_index": "416",
                    "forwarding_channel": "2514911846702448641",
                    "forwarding_htlc_index": "161"
                },
                {
                    "incoming": true,
                    "amount": "7100",
                    "hash_lock": "63debdabfd84228799716da9ed152d06a33245b084e4dc3962361e7b1e9a73e4",
                    "expiration_height": 2347758,
                    "htlc_index": "417",
                    "forwarding_channel": "2514906349145358337",
                    "forwarding_htlc_index": "257"
                },
                {
                    "incoming": true,
                    "amount": "892",
                    "hash_lock": "07c177ea46fd40989a7dd762eaf392ba712c71048cfcb23e4ebc96a84f0ebe0b",
                    "expiration_height": 2347758,
                    "htlc_index": "418",
                    "forwarding_channel": "2514906349145358337",
                    "forwarding_htlc_index": "258"
                },
                {
                    "incoming": true,
                    "amount": "641",
                    "hash_lock": "ba6f7dc3968aee39dde273f3bf5222727e0bd2191313acc1c459f9c347d29d80",
                    "expiration_height": 2347758,
                    "htlc_index": "419",
                    "forwarding_channel": "2514906349145358337",
                    "forwarding_htlc_index": "259"
                },
                {
                    "incoming": true,
                    "amount": "1267",
                    "hash_lock": "e7366d3ccfa29e16ab211eded54fbdf3d6fccf66eeb6b3c20e5b60a31656fc74",
                    "expiration_height": 2347762,
                    "htlc_index": "420",
                    "forwarding_channel": "2514906349145358337",
                    "forwarding_htlc_index": "260"
                }
            ],
            "csv_delay": 3,
            "private": false,
            "initiator": false,
            "chan_status_flags": "ChanStatusDefault",
            "local_chan_reserve_sat": "150000",
            "remote_chan_reserve_sat": "150000",
            "static_remote_key": false,
            "commitment_type": "ANCHORS",
            "lifetime": "5447275",
            "uptime": "5447064",
            "close_address": "",
            "push_amount_sat": "0",
            "thaw_height": 0,
            "local_constraints": {
                "csv_delay": 3,
                "chan_reserve_sat": "150000",
                "dust_limit_sat": "354",
                "max_pending_amt_msat": "14850000000",
                "min_htlc_msat": "1",
                "max_accepted_htlcs": 483
            },
            "remote_constraints": {
                "csv_delay": 3,
                "chan_reserve_sat": "150000",
                "dust_limit_sat": "354",
                "max_pending_amt_msat": "14850000000",
                "min_htlc_msat": "1",
                "max_accepted_htlcs": 483
            }
        }
    ]
}

lnd-3 log

2022-09-23 12:51:29.463 [DBG] CRTR: Payment e7366d3ccfa29e16ab211eded54fbdf3d6fccf66eeb6b3c20e5b60a31656fc74 in state terminate=false, active_shards=0, rem_value=1266000 mSAT, fee_limit=100000000000 mSAT
2022-09-23 12:51:29.471 [DBG] CRTR: PaymentSession(e7366d3ccfa29e16ab211eded54fbdf3d6fccf66eeb6b3c20e5b60a31656fc74): pathfinding for amt=1266000 mSAT
2022-09-23 12:51:29.472 [DBG] LNWL: ChannelPoint(606249f2b0cad6976cbb120d242dfc90c327648dfccb5b3e6275e819b5366b89:0): May add outgoing htlc rejected: commitment transaction dips peer below chan reserve
2022-09-23 12:51:29.474 [DBG] CRTR: Pathfinding absolute attempt cost: 101.266 sats
2022-09-23 12:51:29.475 [DBG] LNWL: ChannelPoint(606249f2b0cad6976cbb120d242dfc90c327648dfccb5b3e6275e819b5366b89:0): May add outgoing htlc rejected: commitment transaction dips peer below chan reserve
2022-09-23 12:51:29.479 [DBG] CRTR: Found route: probability=0.9025, hops=2, fee=1001 mSAT
2022-09-23 12:51:29.481 [DBG] CRTR: Pathfinding perf metrics: nodes=2, edges=65, time=10.226725ms
2022-09-23 12:51:29.557 [DBG] HSWC: ChannelLink(2d9b5dbb8fccfe069c575916cf1dbaa9b951be92504c241289d4fa1802d2f4c2:1): queueing keystone of ADD open circuit: (Chan ID=0:0:0, HTLC ID=3083)->(Chan ID=2287299:32:1, HTLC ID=420)
2022-09-23 12:51:29.558 [DBG] PEER: Sending UpdateAddHTLC(chan_id=c2f4d20218fad48912244c5092be51b9a9ba1dcf1659579c06fecc8fbb5d9b2c, id=420, amt=1267001 mSAT, expiry=2347762, hash=e7366d3ccfa29e16ab211eded54fbdf3d6fccf66eeb6b3c20e5b60a31656fc74) to 02c37560a8f8b82c065abe4c0ce92525398de43931e35196d0155e51c26bde10b4@161.97.146.5:23307
2022-09-23 12:51:29.558 [DBG] CRTR: Payment e7366d3ccfa29e16ab211eded54fbdf3d6fccf66eeb6b3c20e5b60a31656fc74 (pid=3083) successfully sent to switch, route: 2514911846702514177 (1267001 mSAT) -> 2514906349145358337 (1266000 mSAT), cltv 2347762
2022-09-23 12:51:29.560 [DBG] CRTR: Payment e7366d3ccfa29e16ab211eded54fbdf3d6fccf66eeb6b3c20e5b60a31656fc74 in state terminate=false, active_shards=1, rem_value=0 mSAT, fee_limit=99999998999 mSAT
@Roasbeef
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Are you able to reproduce this with lnd v0.15.1?

This sounds expected: each time you add an HTLC, you need to also pay for the fee to add that to the commitment transaction. If you try to add an HTLC, but maybe have the correct balance, it's possible after adding the required fee (at the current fee rate) you don't have enough to still maintain the reserve.

@philipp1992
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even with the fees added to the calculation, it does not add up to a number that would exceed the channel reserves or am i missing something here?

Base Fees (mSats)
1,000
Fee Rate (milli mSats)
1
Fee Rate (%)
0.0001
Time Lock Delta
18

is it possible to lower the timelock to less than 18 blocks , so we dont have too many pending HTLCs?

@Roasbeef
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So I mean chain fees here. Each HTLC you have increases the size of the commitment transaction. So it's possible that you have enough to send, but once you add the HTLC, those fees are too much.

is it possible to lower the timelock to less than 18 blocks , so we dont have too many pending HTLCs?

These aren't really correlated. However I strongly recommend you increase that CLTV delta to more than 18 blocks (our default is 40, and we're looking at increasing it even further). This is a security parameter, if you can't get a confirmation in that period, then you can risk losing HTLCs.

@philipp1992
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philipp1992 commented Nov 26, 2022 •
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can you elaborate what you mean with chain fees? does the fee_sat parameter of the payment affect this?
shouldnt this also be an [Err] log instead of a debug one?

So it's possible that you have enough to send, but once you add the HTLC, those fees are too much.
can you tell that from the logs ive posted?

@bitromortac
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In the initial issue you wrote When creating a hodlinvoice on 3, but from the logs it looks like you attempt a payment from lnd-3 is that correct?

From the logs

            "remote_pubkey": "0245d3a17856831ff07e70e1963cb89ec545b5be7cdeccf311a736bb2e2e25ee13",
            "channel_point": "606249f2b0cad6976cbb120d242dfc90c327648dfccb5b3e6275e819b5366b89:0",
            "chan_id": "2581288264158347264",
            "capacity": "15000000",
            "local_balance": "14879772",
            "remote_balance": "119284",

we can see that the remote balance is already below the channel reserve (150000).

@Roasbeef
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Fixed by #8096

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@Roasbeef @philipp1992 @bitromortac