Some transactions have unusually high gas cost

[danfinlay]

Several users have reported this, but haven't included reproduction steps.

A new member of our Slack just claimed this occurs "if there are 3 or more arguments" to the transaction data.

That seems like a good lead!

Since Parity does our gas estimating, this may end up being a bug over there.

[likangqi666]

I found this kind of bug is related to the amount of function arguments. I tested it with this contract：

 contract test {
   uint data;
   uint data2;
   uint data3;
uint data4;
function changeData(uint _data){
    data = _data;
}
function changeData2(uint _data,uint _data2){
    data = _data;
    data2 = _data2;
}
function changeData3(uint _data,uint _data2, uint _data3){
    data = _data;
    data2 = _data2;
    data3 = _data3;
}
function changeData4(uint _data,uint _data2, uint _data3, uint _data4){
    data = _data;
    data2 = _data2;
    data3 = _data3;
    data4 = _data4;
}

}

If I use a web UI to call this contract. The functions with 3 or 4 arguments will cost arround 2.6 ETH. But if they are called through browser-solidity after created, it will cost less than 0.001 ETH. The browser-solidity is also using the web3 object injected by Metamask.

[danfinlay]

It's actually even weirder that the gas estimate would be different through browser-solidity than through another method, unless browser-solidity is doing its own gas estimation via ethereumjs-vm...

[danfinlay]

Ok, I've tested your theory, @Chillli, but I've failed to reproduce. I don't think this is just a matter of number of arguments, there's something else, too.

Could you do me a favor and reproduce the bug, then while you can see it, paste a UI State Log here?

I think this could really help us narrow down the cause.

[karlfloersch]

It seems I might be getting something similar.

I am trying to send the following transaction (no transaction data) on the Morden testnet:

I'm trying to send the transaction to the following contract address:

0x9882db577cfaac075ae45fc272322280a121b406

Could you do me a favor and reproduce the bug, then while you can see it, paste a UI State Log here?

I tried to follow the link to UI State Log but got a 404 error.

[danfinlay]

@karlfloersch Sorry, looks like that link was somehow pointing at the wrong thing. Try this one:
https://github.com/MetaMask/faq/blob/master/LOGS.md#ui-state-logs-chrome

Hope you can log it! People have been reporting this for like a week, but we haven't been able to reproduce!

[likangqi666]

  {
    "id": 1478393509307154,
    "txParams": {
      "from": "0x8924fd8aab9c5bf779de30002fae3f13da16fb00",
      "to": "0x8de94e6ef12c73de77e27a2e95529b2bd57c0399",
      "data": "0xcac4e27f000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003",
      "metamaskId": 1478393509307154,
      "metamaskNetworkId": "2"
    },
    "time": 1478393509307,
    "status": "unconfirmed",
    "gasMultiplier": 1,
    "containsDelegateCall": false,
    "estimatedGas": "0x802c7a3"
  }
],
"selectedAddress": "0x8924fd8aab9c5bf779de30002fae3f13da16fb00",
"network": "2",
"seedWords": null,
"isConfirmed": true,
"unconfMsgs": {},
"messages": [],
"shapeShiftTxList": [],
"gasMultiplier": 1,
"provider": {
  "type": "testnet"
},
"selectedAccount": "0x8924fd8aab9c5bf779de30002fae3f13da16fb00"
 },
  "appState": {
"menuOpen": false,
"currentView": {
  "name": "confTx",
  "context": 0
},
"accountDetail": {
  "subview": "transactions"
},
"transForward": true,
 "isLoading": false,
 "warning": null
 },
"identities": {}

}

This is when I use the function with 3 arguments.

[likangqi666]

Here is the entire file content:

Download the React DevTools and use an HTTP server (instead of a file: URL) for a better development experience: https://fb.me/react-devtools
logState()
{
"metamask": {
"isInitialized": true,
"isUnlocked": true,
"isEthConfirmed": true,
"rpcTarget": "https://rawtestrpc.metamask.io/",
"identities": {
"0x8924fd8aab9c5bf779de30002fae3f13da16fb00": {
"name": "Issuer",
"address": "0x8924fd8aab9c5bf779de30002fae3f13da16fb00",
"mayBeFauceting": false
},
"0x78a8c503ddc2b71080be04ed9442ab71b9c4094b": {
"name": "Account 2",
"address": "0x78a8c503ddc2b71080be04ed9442ab71b9c4094b",
"mayBeFauceting": false
},
"0xa46e5d26b8cb2e04a81db093de7481e3c3fe0c84": {
"name": "Account 3",
"address": "0xa46e5d26b8cb2e04a81db093de7481e3c3fe0c84",
"mayBeFauceting": false
},
"0xd659b496dfcdd620f0b4dba0d933cd1381084e42": {
"name": "Account 4",
"address": "0xd659b496dfcdd620f0b4dba0d933cd1381084e42",
"mayBeFauceting": false
}
},
"unconfTxs": {
"1478393509307154": {
"id": 1478393509307154,
"txParams": {
"from": "0x8924fd8aab9c5bf779de30002fae3f13da16fb00",
"to": "0x8de94e6ef12c73de77e27a2e95529b2bd57c0399",
"data": "0xcac4e27f000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000003",
"metamaskId": 1478393509307154,
"metamaskNetworkId": "2"
},
"time": 1478393509307,
"status": "unconfirmed",
"gasMultiplier": 1,
"containsDelegateCall": false,
"estimatedGas": "0x802c7a3"
}
},
"currentFiat": "EUR",
"conversionRate": 9.92890269,
"conversionDate": 1478395321,
"accounts": {
"0x8924fd8aab9c5bf779de30002fae3f13da16fb00": {
"code": "0x",
"balance": "0x227e780c35c0de3d",
"nonce": "0x10002b",
"address": "0x8924fd8aab9c5bf779de30002fae3f13da16fb00"
},
"0x78a8c503ddc2b71080be04ed9442ab71b9c4094b": {
"code": "0x",
"balance": "0x00",
"nonce": "0x100000",
"address": "0x78a8c503ddc2b71080be04ed9442ab71b9c4094b"
},
"0xa46e5d26b8cb2e04a81db093de7481e3c3fe0c84": {
"code": "0x",
"balance": "0x2887bcd75db30fe3",
"nonce": "0x100005",
"address": "0xa46e5d26b8cb2e04a81db093de7481e3c3fe0c84"
},
"0xd659b496dfcdd620f0b4dba0d933cd1381084e42": {
"code": "0x",
"balance": "0x00",
"nonce": "0x100000",
"address": "0xd659b496dfcdd620f0b4dba0d933cd1381084e42"
}
},
"transactions": [
{
"id": 1478263595762763,
"txParams": {
"from": "0xa46e5d26b8cb2e04a81db093de7481e3c3fe0c84",
"to": "0xd5ceaab0446d181f28584d6d5597c2ec702f12e2",
"value": "0x0",
"data": "0x698587e4",
"gas": "0x5562",
"metamaskId": 1478263595762763,
"metamaskNetworkId": "2"
},
"time": 1478263595762,
"status": "rejected",
"gasMultiplier": 1,
"estimatedGas": "0x9dc02",
"containsDelegateCall": false
},
{
"id": 1478263595763035,
"txParams": {
"from": "0xa46e5d26b8cb2e04a81db093de7481e3c3fe0c84",
"to": "0xd5ceaab0446d181f28584d6d5597c2ec702f12e2",
"value": "0x0",
"data": "0x8a7271f6",
"gas": "0x55a4",
"metamaskId": 1478263595763035,
"metamaskNetworkId": "2"
},
"time": 1478263595763,
"status": "rejected",
"gasMultiplier": 1,
"estimatedGas": "0x9dc44",
"containsDelegateCall": false
},
{
"id": 1478263656872933,
"txParams": {
"from": "0xa46e5d26b8cb2e04a81db093de7481e3c3fe0c84",
"to": "0xd5ceaab0446d181f28584d6d5597c2ec702f12e2",
"data": "0xc2a93060000000000000000000000000a46e5d26b8cb2e04a81db093de7481e3c3fe0c840000000000000000000000000000000000000000000000000000000000001ed8000000000000000000000000000000000000000000000000000000000000000f",
"metamaskId": 1478263656872933,
"metamaskNetworkId": "2"
},
"time": 1478263656872,
"status": "rejected",
"gasMultiplier": 1,
"containsDelegateCall": false,
"estimatedGas": "0x802d362"
},
{
"id": 1478263690914475,
"txParams": {
"from": "0xa46e5d26b8cb2e04a81db093de7481e3c3fe0c84",
"value": "0x0",
"data": 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"gas": "0x15a74d",
"metamaskId": 1478263690914475,
"metamaskNetworkId": "2"
},
"time": 1478263690914,
"status": "confirmed",
"gasMultiplier": 1,
"estimatedGas": "0x8172ded",
"hash": "0xc2eb58a8d4c7b7dfbd7fe48470eef504100908859df6fe090c1457ef9c751d89"
},
{
"id": 1478263788622225,
"txParams": {
"from": "0xa46e5d26b8cb2e04a81db093de7481e3c3fe0c84",
"to": "0xd5ceaab0446d181f28584d6d5597c2ec702f12e2",
"data": "0xc2a93060000000000000000000000000a46e5d26b8cb2e04a81db093de7481e3c3fe0c84000000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000c",
"metamaskId": 1478263788622225,
"metamaskNetworkId": "2"
},
"time": 1478263788622,
"status": "rejected",
"gasMultiplier": 1,
"containsDelegateCall": false,
"estimatedGas": "0x802d322"
},
{
"id": 1478263805965593,
"txParams": {
"from": "0xa46e5d26b8cb2e04a81db093de7481e3c3fe0c84",
"to": "0xd5ceaab0446d181f28584d6d5597c2ec702f12e2",
"data": "0xc2a93060000000000000000000000000a46e5d26b8cb2e04a81db093de7481e3c3fe0c8400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
"metamaskId": 1478263805965593,
"metamaskNetworkId": "2"
},
"time": 1478263805965,
"status": "rejected",
"gasMultiplier": 1,
"containsDelegateCall": false,
"estimatedGas": "0xa5d72"
},
{
"id": 1478263831930285,
"txParams": {
"from": "0xa46e5d26b8cb2e04a81db093de7481e3c3fe0c84",
"to": "0xb656e436e9d7cb8b6ea4371f6622311b4fc6c56b",
"value": "0x0",
"data": "0x8a7271f6",
"gas": "0x55ba",
"metamaskId": 1478263831930285,
"metamaskNetworkId": "2"
},
"time": 1478263831930,
"status": "rejected",
"gasMultiplier": 1,
"containsDelegateCall": false,
"estimatedGas": "0x9dc5a"
},
{
"id": 1478263831935673,
"txParams": {
"from": "0xa46e5d26b8cb2e04a81db093de7481e3c3fe0c84",
"to": "0xb656e436e9d7cb8b6ea4371f6622311b4fc6c56b",
"value": "0x0",
"data": "0x52c448d6",
"gas": "0x550a",
"metamaskId": 1478263831935673,
"metamaskNetworkId": "2"
},
"time": 1478263831935,
"status": "rejected",
"gasMultiplier": 1,
"containsDelegateCall": false,
"estimatedGas": "0x9dbaa"
},
{
"id": 1478263831936544,
"txParams": {
"from": "0xa46e5d26b8cb2e04a81db093de7481e3c3fe0c84",
"to": "0xb656e436e9d7cb8b6ea4371f6622311b4fc6c56b",
"value": "0x0",
"data": "0x698587e4",
"gas": "0x5578",
"metamaskId": 1478263831936544,
"metamaskNetworkId": "2"
},
"time": 1478263831936,
"status": "rejected",
"gasMultiplier": 1,
"containsDelegateCall": false,
"estimatedGas": "0x9dc18"
},
{
"id": 1478263831938373,
"txParams": {
"from": "0xa46e5d26b8cb2e04a81db093de7481e3c3fe0c84",
"to": "0xb656e436e9d7cb8b6ea4371f6622311b4fc6c56b",
"value": "0x0",
"data": "0xc249ff08",
"gas": "0x55fc",
"metamaskId": 1478263831938373,
"metamaskNetworkId": "2"
},
"time": 1478263831938,
"status": "rejected",
"gasMultiplier": 1,
"estimatedGas": "0x9dc9c",
"containsDelegateCall": false
},
{
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undefined

[karlfloersch]

@FlySwatter I've found a pattern around when the error is coming up. I've noticed that sending ETH to any contract address has extremely high transaction fees. However, sending ETH to normal addresses are fine.

For consistency, I reinstalled MetaMask, created a new vault and made sure to be on Morden. I've tested this with 3 contract addresses with varying amounts of ETH and 2 account addresses.

[danfinlay]

Well that's very easy to test, thanks! We'll be hopefully tracking this down once and for all tomorrow, lots of fresh leads.

• Dan

On Nov 6, 2016, at 3:14 PM, Karl Floersch [email protected] wrote:

@FlySwatter I've found a pattern around when the error is coming up. I've noticed that sending ETH to any contract address has extremely high transaction fees. However, sending ETH to normal addresses are fine.

For consistency, I reinstalled MetaMask, created a new vault and made sure to be on Morden. I've tested this with 3 contract addresses with varying amounts of ETH and 2 account addresses.

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[danfinlay]

Found it. Turns out bn.js has some unusual behavior when parsing hex-prefixed data.

[karlfloersch]

It seems that this is still an issue, even though the gas prices are orders of magnitude more reasonable. The issue is, when sending transactions to contracts gas is pretty costly (about 1 ETH for 0.1 ETH transaction) and the actual transactions never go through.

To test this, simply try sending a transaction on the Morden network to an account:
ex: https://testnet.etherscan.io/address/0xb45b1f6c9b5baf7910a768e2992acb701596550f

and then to a contract:
ex: https://testnet.etherscan.io/address/0xb45b1f6c9b5baf7910a768e2992acb701596550f

The first one (normal accounts) go through, but the 2nd (contract address) doesn't ever appear in EtherScan.