[Bug] Blocks on anvil node hang after some time

[StackOverflowExcept1on]

Component

node-bindings, provider, pubsub

What version of Alloy are you on?

alloy v0.1.4
anvil v0.2.0 (e903484 2024-07-19T00:35:00.564315108Z)

Operating System

Linux

Describe the bug

Minimal example:

• https://github.com/StackOverflowExcept1on/alloy-anvil-bug
• https://github.com/StackOverflowExcept1on/alloy-anvil-bug/blob/master/src/main.rs

git clone git@github.com:StackOverflowExcept1on/alloy-anvil-bug.git
cd alloy-anvil-bug
cargo run --release

2024-07-19 13:01:50.523 DEBUG tungstenite::handshake::client: Client handshake done.
2024-07-19 13:01:50.523 DEBUG alloy_rpc_client::call: sending request method=eth_subscribe id=0
2024-07-19 13:01:51.523  INFO alloy_anvil_bug: block_number = 1
2024-07-19 13:01:52.523  INFO alloy_anvil_bug: block_number = 2
2024-07-19 13:01:53.522  INFO alloy_anvil_bug: block_number = 3
2024-07-19 13:01:54.522  INFO alloy_anvil_bug: block_number = 4
...
2024-07-19 13:03:37.522  INFO alloy_anvil_bug: block_number = 107
^^^ in my case the hang occurs on this block

[StackOverflowExcept1on]

When I start reading stdout through BufReader everything works as intended.

let mut anvil = Anvil::new().block_time(1).try_spawn()?;
let provider = ProviderBuilder::new()
    .on_builtin(&anvil.ws_endpoint())
    .await?;

//workaroud:
let child = anvil.child_mut();
let stdout = child.stdout.take().unwrap();

tokio::task::spawn(async {
    let mut reader = BufReader::new(stdout);
    loop {
        let mut line = String::new();
        reader.read_line(&mut line).unwrap();
    }
});

let block_subscription = provider.subscribe_blocks().await?;
let mut block_stream = block_subscription.into_stream();

while let Some(block) = block_stream.next().await {
    let block_number = block.header.number.expect("failed to get block number");
    tracing::info!("block_number = {block_number}");
}

[StackOverflowExcept1on]

To speed up reproduction use .block_time_f64(0.001):

let anvil = Anvil::new().block_time_f64(0.001).try_spawn()?;

[StackOverflowExcept1on]

Very similar problem, but in foundry foundry-rs/foundry#3414

https://doc.rust-lang.org/std/process/struct.Stdio.html#method.piped

Writing more than a pipe buffer’s worth of input to stdin without also reading stdout and stderr at the same time may cause a deadlock. This is an issue when running any program that doesn’t guarantee that it reads its entire stdin before writing more than a pipe buffer’s worth of output. The size of a pipe buffer varies on different targets.