Topic

parking_lot

1 post about parking_lot. Every summary links to the original.

Paid picks we use ourselves. Links carry a referral code — a subscription through one earns us a commission at no extra cost to you.

Newest first

Posts

Fly.io
parking_lot: ffffffffffffffff...
Fly.io’s fly-proxy, a Rust-based Anycast router, suffered lockups while managing rapidly changing routing state across thousands of servers. An earlier outage came from an if let expression that kept a read lock through both branches, while later regionalization and lazy loading increased write contention in the Catalog. The investigation traced the new failures to parking_lot’s try_write_for wakeup path: after a waiting writer timed out, it attempted to clear WRITER and WRITER_PARKED together even though one bit had already been cleared, and wrapping arithmetic produced the corrupted lock value 0xFFFFFFFFFFFFFFFE. The parking_lot team fixed the defect, after which the lockups did not recur; the team also audited Catalog locking, removed if let patterns and RAII lock guards, and added lock-timing metrics, labeled slow-write logs, and holder tracking.

The best engineering reads, once a week.

Topic

1 post about parking_lot. Every summary links to the original.

Paid picks we use ourselves. Links carry a referral code — a subscription through one earns us a commission at no extra cost to you.

Newest first

Fly.io
parking_lot: ffffffffffffffff...
Fly.io’s fly-proxy, a Rust-based Anycast router, suffered lockups while managing rapidly changing routing state across thousands of servers. An earlier outage came from an if let expression that kept a read lock through both branches, while later regionalization and lazy loading increased write contention in the Catalog. The investigation traced the new failures to parking_lot’s try_write_for wakeup path: after a waiting writer timed out, it attempted to clear WRITER and WRITER_PARKED together even though one bit had already been cleared, and wrapping arithmetic produced the corrupted lock value 0xFFFFFFFFFFFFFFFE. The parking_lot team fixed the defect, after which the lockups did not recur; the team also audited Catalog locking, removed if let patterns and RAII lock guards, and added lock-timing metrics, labeled slow-write logs, and holder tracking.

The best engineering reads, once a week.