code ELOCKED during compile if importing in config file

[aerth]

Adding the import breaks compilation. Maybe because Lots of contracts in the ./contracts directory... Tried putting on the top, or bottom of imports, same error. Removed the import, compilation works (but then script fails because it needs import)

The validations.json file starts to grow, and then the error is thrown.

I can add more info if needed. Maybe its a version mismatch somewhere.

here is the top of hardhat-config.ts

import { HardhatUserConfig, task } from "hardhat/config";
import "@openzeppelin/hardhat-upgrades"; // moved to bottom, top, same error
import "@nomiclabs/hardhat-etherscan";
import "@nomiclabs/hardhat-waffle";
import "@typechain/hardhat";
import "hardhat-gas-reporter";
import "solidity-coverage";

here is the error when compiling with @openzeppelin

An unexpected error occurred:

Error: Lock file is already being held
    at /path/to/repo/node_modules/proper-lockfile/lib/lockfile.js:68:47
    at callback (/path/to/repo/node_modules/graceful-fs/polyfills.js:299:20)
    at FSReqCallback.oncomplete (node:fs:199:5) {
  code: 'ELOCKED',
  file: '/path/to/repo/cache/validations.json'
}
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

[ericglau]

I was able to reproduce this issue and will look into it.

Related to #530 which is needed for Hardhat 2.9.0.

As a workaround, use Hardhat 2.8.4 for now (npm install hardhat@2.8.4).

[frangio]

Maybe because Lots of contracts in the ./contracts directory...

Yes, this is contributing high contention on this lock. How many contracts do you have?

[aerth]

happened at 76 contract files (hehehe) but tried starting with empty and found that around 10 it starts racing
for i in {1..30}; do echo "Try ${i}: Number of contracts: $(find ./contracts/ -type f | wc -l)"; yarn hardhat clean; yarn hardhat compile; done |& egrep 'Try|ELOCKED|Successfully'

[HenryNguyen5]

We're still getting this error for some devs at https://github.com/smartcontractkit/chainlink

I opened #769 to address this by making the retry options configurable

@ericglau @frangio