Replacement transaction underpriced

[piwonskp]

I'm using tx-fuzz through kurtosis and generating a lot of transactions. When there's too many transactions sent tx-fuzz crashes displaying Replacement transaction underpriced. It seems to be the problem with setting nonce when a transaction from previous iteration is still pending. In that case NonceAt may return a nonce of a pending transaction.

I see two potential fixes here:

• Track nonce locally instead of making rpc call each time a transaction is created
• Recover from crashes: ignore errors thrown by node and keep fuzzing

The third, and imo the best, would be a hybrid approach: tracking nonce locally and falling back to rpc method when an exception

[aodhgan]

also seeing this