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Fix Rayon deadlock in test utils (#4837)

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## Issue Addressed

Fix a deadlock in the tests that was causing tests on tree-states to run for hours without finishing: https://github.com/sigp/lighthouse/actions/runs/6491194654/job/17628138360.

## Proposed Changes

Avoid using a Mutex under the Rayon `par_iter`. Instead, use an `AtomicUsize`. I've run the new version several times in a loop and it hasn't deadlocked (it was deadlocking consistently on tree-states).

## Additional Info

The same bug exists in unstable and tree-states, but I'm not sure why it was triggering so consistently on the tree-states branch.
This commit is contained in:
Michael Sproul 2023-10-18 13:36:42 +00:00
parent 463e62e833
commit 192d442718
1 changed files with 14 additions and 9 deletions
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23
beacon_node/beacon_chain/src/test_utils.rs
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@ -52,6 +52,7 @@ use std::collections::{HashMap, HashSet};
use std::fmt;
use std::marker::PhantomData;
use std::str::FromStr;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::Arc;
use std::time::Duration;
use store::{config::StoreConfig, HotColdDB, ItemStore, LevelDB, MemoryStore};
@ -1156,9 +1157,9 @@ where
) -> (Vec<CommitteeAttestations<E>>, Vec<usize>) {
let MakeAttestationOptions { limit, fork } = opts;
let committee_count = state.get_committee_count_at_slot(state.slot()).unwrap();
let attesters = Mutex::new(vec![]);
let num_attesters = AtomicUsize::new(0);
let attestations = state
let (attestations, split_attesters) = state
.get_beacon_committees_at_slot(attestation_slot)
.expect("should get committees")
.iter()
@ -1171,13 +1172,14 @@ where
return None;
}
let mut attesters = attesters.lock();
if let Some(limit) = limit {
if attesters.len() >= limit {
// This atomics stuff is necessary because we're under a par_iter,
// and Rayon will deadlock if we use a mutex.
if num_attesters.fetch_add(1, Ordering::Relaxed) >= limit {
num_attesters.fetch_sub(1, Ordering::Relaxed);
return None;
}
}
attesters.push(*validator_index);
let mut attestation = self
.produce_unaggregated_attestation_for_block(
@ -1217,14 +1219,17 @@ where
)
.unwrap();
Some((attestation, subnet_id))
Some(((attestation, subnet_id), validator_index))
})
.collect::<Vec<_>>()
.unzip::<_, _, Vec<_>, Vec<_>>()
})
.collect::<Vec<_>>();
.unzip::<_, _, Vec<_>, Vec<_>>();
// Flatten attesters.
let attesters = split_attesters.into_iter().flatten().collect::<Vec<_>>();
let attesters = attesters.into_inner();
if let Some(limit) = limit {
assert_eq!(limit, num_attesters.load(Ordering::Relaxed));
assert_eq!(
limit,
attesters.len(),