ethers.js: estimateGas Error: failed to meet quorum

Might be duplicate of #841 I often receive this error when I try to estimate gas for my transaction. Most of the times it works but often times it throws error shown below.

I’m using ethers v5.0.8

Error: failed to meet quorum (method="estimateGas", 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code=SERVER_ERROR, version=providers/5.0.5)

About this issue

Original URL
State: closed
Created 4 years ago
Comments: 42 (14 by maintainers)

Commits related to this issue

Better error forwarding from FallbackProvider (#1021). — committed to ethers-io/ethers.js by ricmoo 4 years ago

Most upvoted comments

I’ve updated the JsonRpcProvider to better support detecting unpredictable gas errors and set a list of forwardable errors for the FallbackProvider. Since a quorum indicating unpredictable gas is actually a correct response.

I’m just testing locally and will put it up soon.

It shouldn’t remove any errors, but will make errors easier to understand and more importantly reflect the detectable standard blockchain errors ethers is designed to detect. 😃

ricmoo on Sep 11, 2020

I still need to look into the processing error, but making the error more readable was step 1. 😃

ricmoo on Sep 9, 2020

I’ll try getting a version out tomorrow that at least makes that error blob readable and somewhat concise. I think that’s step 1. 😃

ricmoo on Sep 2, 2020

Oh! I see what you mean. I didn’t realize the provider lines were different. I only copied the long lines. Now I’m guessing they were the same. I can try again later.

Yes, quorum only applies to FallbackProvider. 😃

ricmoo on Aug 29, 2020

Gas estimates with FallBackProvider are problematic. I often get 4 different results from the 4 different back-ends I use (My own parity node, Infura, Cloudflare, Alchemy) and therefore can’t reach a quorum of 2. I think the Fallback provider should return the median value among the responding back-ends.

guifel on Nov 13, 2020

Anyways, try out 5.0.13, which should bubble better errors up for call and estimateGas from all the backends, including the FallbackProvider.

Thank you very much, errors are nice and readable now.

{"reason":"cannot estimate gas; transaction may fail or may require manual gas limit","code":"UNPREDICTABLE_GAS_LIMIT","transaction":{"from":"0xB660b10a922815667F0303576750FDBC6943e44a","gasPrice":{"type":"BigNumber","hex":"0x40ba175c00"},"to":"0xA0940f0388601f96D8885292A711C25665e325c8","value":{"type":"BigNumber","hex":"0x00"},"data":"0xa4240de696a54484eb73f09792a3b529167cc2b72338cddcddcc9d27b3d44e83ffd1230b000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000001a0bdd3d408de4955891f5def8a7512edb93fa70047d9ca2aaab715e03482a6f60500000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000f4240000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004c4b400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000209bfaf2e99a1ab35fe0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000bba7b579d85322f69f600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"},"error":{"reason":"processing response error","code":"SERVER_ERROR","body":"{\"jsonrpc\":\"2.0\",\"id\":1134,\"error\":{\"code\":-32000,\"message\":\"gas required exceeds allowance (8000000) or always failing transaction\"}}","error":{"code":-32000},"requestBody":"{\"method\":\"eth_estimateGas\",\"params\":[{\"gasPrice\":\"0x40ba175c00\",\"value\":\"0x0\",\"from\":\"0xb660b10a922815667f0303576750fdbc6943e44a\",\"to\":\"0xa0940f0388601f96d8885292a711c25665e325c8\",\"data\":\"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\"}],\"id\":1134,\"jsonrpc\":\"2.0\"}","requestMethod":"POST","url":"https://ropsten.infura.io/v3/"},"level":"error","message":"Can't broadcast transactioncannot estimate gas; transaction may fail or may require manual gas limit (transaction={\"from\":\"0xB660b10a922815667F0303576750FDBC6943e44a\",\"gasPrice\":{\"type\":\"BigNumber\",\"hex\":\"0x40ba175c00\"},\"to\":\"0xA0940f0388601f96D8885292A711C25665e325c8\",\"value\":{\"type\":\"BigNumber\",\"hex\":\"0x00\"},\"data\":\"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\"}, error={\"reason\":\"processing response error\",\"code\":\"SERVER_ERROR\",\"body\":\"{\\\"jsonrpc\\\":\\\"2.0\\\",\\\"id\\\":1134,\\\"error\\\":{\\\"code\\\":-32000,\\\"message\\\":\\\"gas required exceeds allowance (8000000) or always failing transaction\\\"}}\",\"error\":{\"code\":-32000},\"requestBody\":\"{\\\"method\\\":\\\"eth_estimateGas\\\",\\\"params\\\":[{\\\"gasPrice\\\":\\\"0x40ba175c00\\\",\\\"value\\\":\\\"0x0\\\",\\\"from\\\":\\\"0xb660b10a922815667f0303576750fdbc6943e44a\\\",\\\"to\\\":\\\"0xa0940f0388601f96d8885292a711c25665e325c8\\\",\\\"data\\\":\\\"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\\\"}],\\\"id\\\":1134,\\\"jsonrpc\\\":\\\"2.0\\\"}\",\"requestMethod\":\"POST\",\"url\":\"https://ropsten.infura.io/v3/\"}, code=UNPREDICTABLE_GAS_LIMIT, version=providers/5.0.8)","stack":"Error: cannot estimate gas; transaction may fail or may require manual gas limit (transaction={\"from\":\"0xB660b10a922815667F0303576750FDBC6943e44a\",\"gasPrice\":{\"type\":\"BigNumber\",\"hex\":\"0x40ba175c00\"},\"to\":\"0xA0940f0388601f96D8885292A711C25665e325c8\",\"value\":{\"type\":\"BigNumber\",\"hex\":\"0x00\"},\"data\":\"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\"}, error={\"reason\":\"processing response error\",\"code\":\"SERVER_ERROR\",\"body\":\"{\\\"jsonrpc\\\":\\\"2.0\\\",\\\"id\\\":1134,\\\"error\\\":{\\\"code\\\":-32000,\\\"message\\\":\\\"gas required exceeds allowance (8000000) or always failing transaction\\\"}}\",\"error\":{\"code\":-32000},\"requestBody\":\"{\\\"method\\\":\\\"eth_estimateGas\\\",\\\"params\\\":[{\\\"gasPrice\\\":\\\"0x40ba175c00\\\",\\\"value\\\":\\\"0x0\\\",\\\"from\\\":\\\"0xb660b10a922815667f0303576750fdbc6943e44a\\\",\\\"to\\\":\\\"0xa0940f0388601f96d8885292a711c25665e325c8\\\",\\\"data\\\":\\\"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\\\"}],\\\"id\\\":1134,\\\"jsonrpc\\\":\\\"2.0\\\"}\",\"requestMethod\":\"POST\",\"url\":\"https://ropsten.infura.io/v3/\"}, code=UNPREDICTABLE_GAS_LIMIT, version=providers/5.0.8)\n    at Logger.makeError (/usr/src/app/node_modules/@ethersproject/logger/lib/index.js:179:21)\n    at Logger.throwError (/usr/src/app/node_modules/@ethersproject/logger/lib/index.js:188:20)\n    at InfuraProvider.<anonymous> (/usr/src/app/node_modules/ethers/node_modules/@ethersproject/providers/lib/json-rpc-provider.js:481:36)\n    at step (/usr/src/app/node_modules/ethers/node_modules/@ethersproject/providers/lib/json-rpc-provider.js:46:23)\n    at Object.throw (/usr/src/app/node_modules/ethers/node_modules/@ethersproject/providers/lib/json-rpc-provider.js:27:53)\n    at rejected (/usr/src/app/node_modules/ethers/node_modules/@ethersproject/providers/lib/json-rpc-provider.js:19:65)\n    at process._tickCallback (internal/process/next_tick.js:68:7)","dd":{"trace_id":"7186435170813026667","span_id":"7186435170813026667","service":"transaction-manager","version":"1.0.0","env":"dev"},"timestamp":"2020-09-14 14:16:48"}

I again reviewed this service code, seems like the issue was the same that I pointed a few days ago here

But upon re-examining the function & keeping backend consensus in mind, I have this condition in my contract function require(time_stored_prevs <= now, we sent the transaction as soon as time_stored_prevs <= now (off-chain), Can this be the cause of it? What do you think?

I have updated the service accordingly and not getting error since past 24 hours.

Thanks for the help @ricmoo & @zemse

dev1644 on Sep 15, 2020

Finally got the CI passing again (looks like GitHub removed lib-usb from their default linux distro?).

Anyways, try out 5.0.13, which should bubble better errors up for call and estimateGas from all the backends, including the FallbackProvider.

Let me know how it works out for you. 😃

ricmoo on Sep 12, 2020

I get a quorum error in both cases. <strike>How do you cause that in the contract?</strike>

I was planning to put some refactoring into the FallbackProvider, maybe it’s a good time to do that. I want to make the errors more concise, and favour errors that are more meaningful than just pick the first error.

Mainly I need to make quorum either a number of a more advanced callable, because Alchemy currently only allows a block range of 1000 for getLogs, so in the event the request is a getLogs beyond that range, I want to pull it from the quorum (for the default provider) since it will always throw an error…

ricmoo on Aug 29, 2020

So Vyper is intentionally not Turing complete, which is why they can do it. 😃

But many things can have their worst case computed, such as a token transfer. Worst case beyond logic the storage, which if it was zero costs 20k gas, if non-zero, 5k; so if you assume 20k you’re golden.

But it’s true though, many things don’t have a worst case. But you can still come up with reasonable assumptions. Or rely on estimateGas for things that iterate over loops and such. But keep in mind things that are unbound also become an attack vector. So, generally it’s best to try keeping real-time constraints in mind when writing a contract, or it is possible under normal use it may become unusable. 😃

I generally limit gas to out-going calls too (for things I don’t have control over), to prevent them from kicking me in the butt. Just another idea.

Gas is its own, and very important east in Ethereum. 😃

ricmoo on Aug 28, 2020

You don’t need a FallbackProvider. You could also use a FallbackProvider, but override the quorum to 1. This would effectively say whatever backend responds first, use their answer.

The value of the quorum is two-fold; a) prevents a single node from lying to you (through accident or malice) and b) keeps you app alive even if a backend is down.

If you only care about b), you can totally tune the quorum to a lower value. The default is half the backends, rounded up. So, with 3 backends, it would be 2. To override:

const provider = new FallbackProvider(providers, 1);

Does that help?

ricmoo on Aug 28, 2020