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[client]: Fix for incorrectly dropped consensus messages (#11082) (#11086)

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Fixes a race condition causing the currently_queued counter to underflow and consensus messages getting dropped incorrectly as a consequence.
This commit is contained in:
David Forstenlechner 2019-09-25 19:45:49 +02:00 committed by David
parent d9201aa6f2
commit 7c5fd042f3
1 changed files with 13 additions and 4 deletions
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17
ethcore/src/client/client.rs
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@ -16,10 +16,11 @@
use std::cmp;
use std::collections::{BTreeMap, HashSet, VecDeque};
use std::convert::TryFrom;
use std::io::{BufRead, BufReader};
use std::str::from_utf8;
use std::sync::{Arc, Weak};
use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering as AtomicOrdering};
use std::sync::atomic::{AtomicBool, AtomicI64, Ordering as AtomicOrdering};
use std::time::{Duration, Instant};
use ansi_term::Colour;
@ -2739,12 +2740,17 @@ fn transaction_receipt(
/// Queue some items to be processed by IO client.
struct IoChannelQueue {
currently_queued: Arc<AtomicUsize>,
limit: usize,
/// Using a *signed* integer for counting currently queued messages since the
/// order in which the counter is incremented and decremented is not defined.
/// Using an unsigned integer can (and will) result in integer underflow,
/// incorrectly rejecting messages and returning a FullQueue error.
currently_queued: Arc<AtomicI64>,
limit: i64,
}
impl IoChannelQueue {
pub fn new(limit: usize) -> Self {
let limit = i64::try_from(limit).unwrap_or(i64::max_value());
IoChannelQueue {
currently_queued: Default::default(),
limit,
@ -2756,9 +2762,12 @@ impl IoChannelQueue {
{
let queue_size = self.currently_queued.load(AtomicOrdering::Relaxed);
if queue_size >= self.limit {
return Err(EthcoreError::FullQueue(self.limit))
let err_limit = usize::try_from(self.limit).unwrap_or(usize::max_value());
return Err(EthcoreError::FullQueue(err_limit))
};
let count = i64::try_from(count).unwrap_or(i64::max_value());
let currently_queued = self.currently_queued.clone();
let _ok = channel.send(ClientIoMessage::execute(move |client| {
currently_queued.fetch_sub(count, AtomicOrdering::SeqCst);