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+ "quote",
+ "wasm-bindgen-macro-support",
+]
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+ "quote",
+ "syn",
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+ "wasm-bindgen-shared",
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+ "js-sys",
+ "parking_lot 0.9.0",
+ "pin-utils",
+ "send_wrapper",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+]
+
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+ "untrusted",
+]
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+]
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
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+]
+
+[[package]]
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+ "curve25519-dalek",
+ "rand_core 0.5.1",
+ "zeroize",
+]
+
+[[package]]
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+version = "0.4.7"
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+dependencies = [
+ "futures",
+ "log",
+ "nohash-hasher",
+ "parking_lot 0.10.2",
+ "rand 0.7.3",
+ "static_assertions",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3cbac2ed2ba24cc90f5e06485ac8c7c1e5449fe8911aef4d8877218af021a5b8"
+dependencies = [
+ "zeroize_derive",
+]
+
+[[package]]
+name = "zeroize_derive"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a27ff26
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "libp2p-reproducer"
+version = "0.1.0"
+authors = ["Arnaud Lefebvre <a.lefebvre@outlook.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+async-std = "1.5"
+futures = "0.3"
+futures-util = "0.3"
+libp2p = { git = "https://github.com/BlackYoup/rust-libp2p/", rev = "eefd240333e7c6e1397f4dcd567ddb27c0e2224c" }
+#libp2p = "0.20.1"
+log = "0.4"
+pretty_env_logger = "0.4"
+rand = "0.7"
\ No newline at end of file
diff --git a/p2p-private.pk8 b/p2p-private.pk8
new file mode 100644
index 0000000..2231f18
Binary files /dev/null and b/p2p-private.pk8 differ
diff --git a/src/README.md b/src/README.md
new file mode 100644
index 0000000..4961844
--- /dev/null
+++ b/src/README.md
@@ -0,0 +1,19 @@
+This is a reproducer for https://github.com/libp2p/rust-libp2p/issues/1629
+
+In the dependencies, I let my fork with more debug logs. Feel free to use the regular libp2p project. My fork has a panic!() when the handler times out. It's easier to spot it when it happens.
+
+I can't reproduce outside of release mode.
+
+To start it, clear anything listening on ports 4040 / 4041 or change both the PORT environment variable and the BOOTSTRAP_SERVERS multiaddr:
+- Open 3 terminals
+- In terminal one, start: `PRIVATE_KEY_PATH=./p2p-private.pk8 PORT=4040 RUST_LOG=info,libp2p_reproducer=debug cargo run --release`
+- In terminal two, start: `BOOTSTRAP_SERVERS="QmTZWrWZzN7i4h2tGAXFcwkhbaArjPK1BzcF2rFMehkMb7:/ip4/127.0.0.1/tcp/4040" PORT=4041 RUST_LOG=info,libp2p_reproducer=debug,libp2p_mplex=trace cargo run --release 2>/tmp/debug-repro2.txt` (notice the logs redirection)
+- In terminal three, start: `tail -f /tmp/debug-repro2.txt`
+
+The log redirection seems to be needed as soon as you start to log a bit too much. For example, without the `libp2p_mpex=trace` log, the redirection is not needed. I have the same issue on my real project, the bug triggers more often with the redirection.
+
+Wait a few seconds for the DHT bootstrap and then in terminal two, type `POPULATE` and then Enter.
+
+From there, it starts to create 1500 random providers records in the DHT. At some point, if you used my fork, a panic on terminal 2 will appear when the upgrade times out. If you do not use my fork, follow the `remaining={}` log to know how many records are yet to be inserted. If it's not 0 and it stops, it may be the same bug. Wait 10 secs and if it continues, then it's most probably the bug. No error will be returned by kademlia so none of the panic I've put will be hit.
+
+If you can't make it happen with the initial try, type `POPULATE` again and again until it does. On my computer, it usually triggers on the first try.
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..bf1be8e
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,293 @@
+#[macro_use]
+extern crate log;
+
+use libp2p::identity::Keypair;
+use libp2p::{PeerId, Multiaddr, Swarm, Transport, NetworkBehaviour};
+use libp2p::swarm::NetworkBehaviourEventProcess;
+use libp2p::mplex::MplexConfig;
+use libp2p::plaintext::PlainText2Config;
+use libp2p::kad::{Kademlia, KademliaConfig, KademliaEvent, QueryResult, Quorum, GetProvidersError};
+use libp2p::kad::record::{Record, Key};
+use libp2p::kad::record::store::{MemoryStore, MemoryStoreConfig};
+use libp2p::identify::{Identify, IdentifyEvent};
+use libp2p::core::upgrade::Version;
+use libp2p::mplex::MaxBufferBehaviour;
+use std::{io, env};
+use std::str::FromStr;
+use async_std::task::{Context, Poll, self};
+use futures::future;
+use futures_util::{StreamExt, TryStreamExt, AsyncBufReadExt};
+use rand::{thread_rng, distributions::Alphanumeric, Rng};
+
+#[derive(NetworkBehaviour)]
+pub struct MyBehaviour {
+  kademlia: Kademlia<MemoryStore>,
+  identify: Identify,
+  #[behaviour(ignore)]
+  peer_id: PeerId,
+  #[behaviour(ignore)]
+  to_provide: Vec<String>,
+  #[behaviour(ignore)]
+  trigger_items: Vec<String>,
+  #[behaviour(ignore)]
+  populate: bool,
+  #[behaviour(ignore)]
+  trigger_timeout: bool,
+  #[behaviour(ignore)]
+  poll_again: bool,
+}
+
+impl NetworkBehaviourEventProcess<KademliaEvent> for MyBehaviour {
+  fn inject_event(&mut self, event: KademliaEvent) {
+    match event {
+      KademliaEvent::Discovered { .. } => {},
+      _ => trace!("Received Kademlia event: {:?}", event)
+    };
+
+    match event {
+      KademliaEvent::QueryResult { result, .. } => {
+        match result {
+          QueryResult::GetProviders(result) => {
+            debug!("Got kademlia result: {:?}", result);
+            self.trigger_timeout = true;
+            self.poll_again = true;
+            match result {
+              Ok(_) => {},
+              Err(GetProvidersError::Timeout { key, .. }) => panic!("Timeout happend for query {:?}", key),
+            }
+          }
+          QueryResult::PutRecord(Ok(_)) => {
+          },
+          QueryResult::StartProviding(Ok(_)) => {
+            self.poll_again = true;
+            self.populate = true;
+          },
+          QueryResult::PutRecord(Err(err)) => {
+            panic!("Failed to put record: {:?}", err);
+          },
+          QueryResult::Bootstrap(Ok(_)) => {
+
+          }
+          _ => {}
+        };
+      },
+      _ => {}
+    }
+  }
+}
+
+impl NetworkBehaviourEventProcess<IdentifyEvent> for MyBehaviour {
+  fn inject_event(&mut self, event: IdentifyEvent) {
+    trace!("Received identify event: {:?}", event);
+
+    match event {
+      IdentifyEvent::Received { peer_id, info, .. } => {
+        for addr in info.listen_addrs {
+          self.kademlia.add_address(&peer_id, addr);
+        }
+      },
+      _ => {}
+    };
+  }
+}
+
+fn load_keypair() -> io::Result<Keypair> {
+  match env::var("PRIVATE_KEY_PATH") {
+    Ok(path) => {
+      let mut bytes = std::fs::read(path)?;
+      match Keypair::rsa_from_pkcs8(&mut bytes) {
+        Ok(keypair) => Ok(keypair),
+        Err(decoding_error) => Err(io::Error::new(io::ErrorKind::InvalidData, format!("Private key content couldn't be parsed: {:?}", decoding_error))),
+      }
+    },
+    Err(env::VarError::NotPresent) => {
+      debug!("PRIVATE_KEY_PATH not defined, generating random key..");
+      Ok(Keypair::generate_ed25519())
+    },
+    Err(env::VarError::NotUnicode(string)) => {
+      Err(io::Error::new(io::ErrorKind::InvalidData, format!("Value {:?} is not valid unicode", string)))
+    }
+  }
+}
+
+fn get_bootstrap_servers() -> io::Result<Vec<(PeerId, Multiaddr)>> {
+  match env::var("BOOTSTRAP_SERVERS") {
+    Ok(val) => {
+      let servers = val.split(",").map(|server| {
+        let mut splitted = server.split(":");
+        let peer_id = PeerId::from_str(splitted.next().unwrap()).unwrap();
+        let multiaddr = Multiaddr::from_str(splitted.next().unwrap()).unwrap();
+
+        (peer_id, multiaddr)
+      }).collect();
+
+      Ok(servers)
+    },
+    Err(env::VarError::NotPresent) => Ok(Vec::new()),
+    Err(e) => Err(io::Error::new(io::ErrorKind::Other, e))
+  }
+}
+
+fn main() -> io::Result<()> {
+  pretty_env_logger::init_timed();
+  let keypair = load_keypair()?;
+  let peer_id = PeerId::from(keypair.public());
+
+  let bootstrap_servers = get_bootstrap_servers()?;
+
+  let tcp = libp2p::tcp::TcpConfig::new();
+  let plaintext = PlainText2Config{ local_public_key: keypair.public() };
+  let mut mplex = MplexConfig::default();
+  mplex.max_buffer_len_behaviour(MaxBufferBehaviour::Block);
+  mplex.split_send_size(1024 * 1024);
+  mplex.max_substreams(100000);
+  let transport = tcp.upgrade(Version::V1).authenticate(plaintext).multiplex(mplex);
+
+  let mut swarm = {
+    // Create a Kademlia behaviour.
+    let mut store_config = MemoryStoreConfig::default();
+    store_config.max_records = 1024 * 1024;
+    store_config.max_provided_keys = 1024 * 1024;
+    store_config.max_providers_per_key = 1024; // TODO: check again, there are some replication factor to take into account
+    let store = MemoryStore::with_config(peer_id.clone(), store_config);
+    let kademlia_config = KademliaConfig::default();
+    let kademlia = Kademlia::with_config(peer_id.clone(), store, kademlia_config);
+    let identify = Identify::new("/identify/1.0.0".to_string(), "/clevercloud-identify/1.0.0".to_string(), keypair.public());
+    let behaviour = MyBehaviour {
+      kademlia,
+      identify,
+      peer_id: peer_id.clone(),
+      to_provide: Vec::new(),
+      trigger_items: Vec::new(),
+      populate: false,
+      trigger_timeout: false,
+      poll_again: false
+    };
+    Swarm::new(transport, behaviour, peer_id.clone())
+  };
+
+  let bind_to_port = std::env::var("PORT").unwrap_or("0".to_string());
+  Swarm::listen_on(&mut swarm, format!("/ip4/0.0.0.0/tcp/{}", bind_to_port).parse().unwrap()).unwrap();
+
+  for server in &bootstrap_servers {
+    swarm.kademlia.add_address(&server.0, server.1.clone());
+  }
+
+  if bootstrap_servers.len() > 0 {
+    swarm.kademlia.bootstrap().expect("Should bootstrap");
+  }
+
+  let mut stdin = async_std::io::BufReader::new(async_std::io::stdin()).lines();
+
+  // Kick it off.
+  let mut listening = false;
+  task::block_on(future::poll_fn(move |cx: &mut Context| {
+    trace!("future block on");
+    loop {
+      match stdin.try_poll_next_unpin(cx) {
+          Poll::Ready(Some(line)) => parse_line(line.unwrap(), &mut swarm),
+          Poll::Ready(None) => panic!("Stdin closed"),
+          Poll::Pending => break
+      }
+    }
+    trace!("after stdin loop");
+    loop {
+      if swarm.populate {
+        put_provider(&mut swarm);
+      } else if swarm.trigger_timeout {
+        trigger_timeout(&mut swarm);
+      }
+
+      let polled = swarm.poll_next_unpin(cx);
+      info!("polled swarm(): {:?}", polled);
+      match polled {
+        Poll::Ready(Some(event)) => debug!("Poll::ready event {:?}", event),
+        Poll::Ready(None) => {
+          trace!("Got Poll::Ready(None)");
+          return Poll::Ready(())
+        },
+        Poll::Pending => {
+          if !listening {
+            info!("PeerID: {:?}", swarm.peer_id);
+            if let Some(a) = Swarm::listeners(&swarm).next() {
+              info!("Listening on {:?}", a);
+
+              let to_join = format!("JOIN {:?} {:?}", swarm.peer_id, a);
+              info!("{}", to_join.replace("PeerId(\"", "").replace("\")", "").replace("\"", ""));
+              listening = true;
+            } else {
+              return Poll::Pending;
+            }
+          }
+
+          if swarm.poll_again {
+            swarm.poll_again = false;
+            continue;
+          }
+
+          return Poll::Pending;
+        }
+      }
+    }
+  }));
+
+  Ok(())
+}
+
+fn put_provider(swarm: &mut Swarm<MyBehaviour>) {
+  swarm.populate = false;
+  if let Some(item) = swarm.to_provide.pop() {
+    debug!("PUT provider {}. remaining={}", item, swarm.to_provide.len());
+    swarm.kademlia.start_providing(Key::from(item.into_bytes())).expect("Should provide");
+  }
+}
+
+fn trigger_timeout(swarm: &mut Swarm<MyBehaviour>) {
+  swarm.trigger_timeout = false;
+
+  if let Some(item) = swarm.trigger_items.pop() {
+    debug!("Getting providers for {}", item);
+    swarm.kademlia.get_providers(Key::from(item.into_bytes()));
+  } else {
+    error!("Failed to trigger the bug");
+  }
+}
+
+fn parse_line(line: String, swarm: &mut Swarm<MyBehaviour>) {
+  let mut splitted = line.split(' ');
+
+  match splitted.next() {
+    Some("POPULATE") => {
+      for _ in 0..1500 {
+        let rand_string: String = thread_rng()
+          .sample_iter(&Alphanumeric)
+          .take(30)
+          .collect();
+
+        swarm.to_provide.push(rand_string);
+      }
+
+      swarm.populate = true;
+    },
+    Some("GET") => {
+      let key: &str = splitted.next().unwrap();
+      swarm.kademlia.get_record(&Key::from(key.as_bytes().to_vec()), Quorum::One);
+    },
+    Some("GET_PROVIDERS") => {
+      let key: &str = splitted.next().unwrap();
+      swarm.kademlia.get_providers(Key::from(key.as_bytes().to_vec()));
+    }
+    Some("PUT") => {
+      let key: &str = splitted.next().unwrap();
+      let value: &str = splitted.next().unwrap();
+
+      let record = Record::new(key.as_bytes().to_vec(), value.as_bytes().to_vec());
+      swarm.kademlia.put_record(record, Quorum::One).expect("Should put record");
+    },
+    Some("PROVIDE") => {
+      let key: &str = splitted.next().unwrap();
+      swarm.kademlia.start_providing(Key::from(key.as_bytes().to_vec())).expect("Should start providing");
+    },
+    _ => error!("Unknown command")
+  }
+}
\ No newline at end of file