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miner: avoid data race in miner #24349

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Feb 7, 2022
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miner: avoid data race in miner #24349

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3 changes: 3 additions & 0 deletions miner/worker.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1134,6 +1134,9 @@ func (w *worker) commit(env *environment, interval func(), update bool, start ti
if interval != nil {
interval()
}
// Create a local environment copy, avoid the data race with snapshot state.
// https://github.com/ethereum/go-ethereum/issues/24299
env := env.copy()
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A few lines up, at line 1118, we already do w.commit(work.copy(), w.fullTaskHook, true, start). Are you sure this fixes it?

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@rjl493456442 rjl493456442 Feb 7, 2022 •
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Yup, in line 1118, we indeed create the env copy for commit function to isolate the mutation between the commit function and other logic in miner.

However, in the commit function, there are two places can read/write the passed env in the same time. One is updateSnapshot which inits the pending state snapshot from the given env. Another is resultLoop for mutating the state root of the cached env.

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I still don't see how this fixes it. Don't the two still use the same instance, only this time a copy of the one that was passed in?

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If mining is enabled, then the copy of passed env is passed to the sealer and the passed env is passed to the pending state.

block, err := w.engine.FinalizeAndAssemble(w.chain, env.header, env.state, env.txs, env.unclelist(), env.receipts)
if err != nil {
return err
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