- Install dependencies:
yarn install - In one terminal, start Ganache:
yarn run ts-node ganache.ts - In another terminal, run the transaction submitter:
yarn run ts-node send.ts
This repo reproduces a bug in Ganache where transactions with manually-assigned nonces
become stuck in the queued TX pool state, when they are submitted by multiple
processes concurrently.
send.ts generates a number of transactions with sequential nonces
(TRANSACTIONS_PER_CPU). It creates a random Ethereum keypair and signs each
transaction. It then shuffles the transactions randomly and splits them between
N_CPUS independent worker processes. Each process submits its transactions to
Ganache, and waits for a transaction receipt for each.
When N_CPUS = 1 (no concurrency), all receipts return OK.
On some runs, when N_CPUS = 32, or other high numbers, transactions will get
stuck in the txpool in the queued state.
The Ganache logs will show no activity except for eth_blockNumber and eth_chainId;
and send.ts will eventually exit.
Looking at the TX pool, you will see many queued transactions:
curl -X POST --data '{"jsonrpc":"2.0","method":"txpool_content","params":[], "id":1}' http://127.0.0.1:8888
The smallest nonce of the queued transactions will match the current from account
nonce; i.e. the nonce of the sender has been incremented correctly but queued transactions
have not been triggered and are stuck.