100% cpu usage when send data with channel.data #266
Comments
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Could you please take a profile of your program to see where it's looping? |
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How can I do that? |
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Is it enough? |
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There is also additional context of this problem. Probably root reason is target device. |
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I'm facing the same issue - 100% CPU usage (single core) when awaiting In comparison, Minimal example: use async_trait::async_trait;
use russh::client;
use russh::client::Config;
use russh_keys::key;
use std::sync::Arc;
#[tokio::main]
async fn main() -> anyhow::Result<()> {
let addrs = ("10.0.0.123", 22);
let mut session = client::connect(Arc::new(Config::default()), addrs, Client).await?;
let auth_ok = session.authenticate_password("user", "pass").await?;
if !auth_ok {
anyhow::bail!("auth failed");
}
let channel = session.channel_open_session().await?;
channel.exec(true, "cat > /dev/null").await?;
let infinite_data = tokio::io::repeat(b'A');
println!("sending data");
channel.data(infinite_data).await?;
unreachable!();
}
struct Client;
#[async_trait]
impl client::Handler for Client {
type Error = russh::Error;
async fn check_server_key(
&mut self,
_server_public_key: &key::PublicKey,
) -> Result<bool, Self::Error> {
Ok(true)
}
}(I'm using russh Flamegraph: flamegraph.svg.gz I generated the flamegraph using I also turned on debuginfo in the release profile: # Cargo.toml
[profile.release]
debug = true |
Recently I got strange behavior on my app, it can stuck with 100% cpu usage forever, and only restart of proccess can fix that.
After some investigations, I found that it happens here:
Debug log:
log.txt
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