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Fix deadlock in network-devp2p (#11013)

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* Fix deadlock in `network-devp2p`

* Add note for locking order in `network-devp2p`
This commit is contained in:
Atkins 2019-09-02 16:56:08 +08:00 committed by David
parent 00124b5a4b
commit 05f9606bf2
1 changed files with 11 additions and 5 deletions
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16
util/network-devp2p/src/host.rs
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@ -261,6 +261,8 @@ struct ProtocolTimer {
}
/// Root IO handler. Manages protocol handlers, IO timers and network connections.
///
/// NOTE: must keep the lock in order of: reserved_nodes (rwlock) -> session (mutex, from sessions)
pub struct Host {
pub info: RwLock<HostInfo>,
udp_socket: Mutex<Option<UdpSocket>>,
@ -722,12 +724,13 @@ impl Host {
let session_result = session.lock().readable(io, &self.info.read());
match session_result {
Err(e) => {
let reserved_nodes = self.reserved_nodes.read();
let s = session.lock();
trace!(target: "network", "Session read error: {}:{:?} ({:?}) {:?}", token, s.id(), s.remote_addr(), e);
match e {
Error::Disconnect(DisconnectReason::IncompatibleProtocol) | Error::Disconnect(DisconnectReason::UselessPeer) => {
if let Some(id) = s.id() {
if !self.reserved_nodes.read().contains(id) {
if !reserved_nodes.contains(id) {
let mut nodes = self.nodes.write();
nodes.note_failure(&id);
nodes.mark_as_useless(id);
@ -741,6 +744,7 @@ impl Host {
},
Ok(SessionData::Ready) => {
let (_, egress_count, ingress_count) = self.session_count();
let reserved_nodes = self.reserved_nodes.read();
let mut s = session.lock();
let (min_peers, mut max_peers, reserved_only, self_id) = {
let info = self.info.read();
@ -765,7 +769,7 @@ impl Host {
if reserved_only ||
(s.info.originated && egress_count > min_peers) ||
(!s.info.originated && ingress_count > max_ingress) {
if !self.reserved_nodes.read().contains(&id) {
if !reserved_nodes.contains(&id) {
// only proceed if the connecting peer is reserved.
trace!(target: "network", "Disconnecting non-reserved peer {:?}", id);
s.disconnect(io, DisconnectReason::TooManyPeers);
@ -980,7 +984,8 @@ impl Host {
for i in to_remove {
trace!(target: "network", "Removed from node table: {}", i);
}
self.nodes.write().update(node_changes, &*self.reserved_nodes.read());
let reserved_nodes = self.reserved_nodes.read();
self.nodes.write().update(node_changes, &*reserved_nodes);
}
pub fn with_context<F>(&self, protocol: ProtocolId, io: &IoContext<NetworkIoMessage>, action: F) where F: FnOnce(&dyn NetworkContextTrait) {
@ -1066,8 +1071,9 @@ impl IoHandler<NetworkIoMessage> for Host {
},
NODE_TABLE => {
trace!(target: "network", "Refreshing node table");
self.nodes.write().clear_useless();
self.nodes.write().save();
let mut nodes = self.nodes.write();
nodes.clear_useless();
nodes.save();
},
_ => match self.timers.read().get(&token).cloned() {
Some(timer) => match self.handlers.read().get(&timer.protocol).cloned() {