Who contributed to Vercel on August 9, 2026?

2 developers shipped this update, including lukesandberg and sampoder.

What were the notable Vercel updates?

[turbopack] Fix a potential deadlock in scope_and_block, Remove the turbopack-build-events trace span, use `next build` instead (#96746), and [turbopack] Treat constants with values referencing other values as unsafe (#96190).

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The Wire · Showcase

TURBOPACK FIXES DEADLOCK THAT COULD HANG YOUR BUILDS

By RepoJournal · Filed 06:55 UTC on August 9, 2026 · About Vercel

2 people shipped this

lukesandberg @lukesandberg 2 cited

sampoder @sampoder 1 cited

Luke Sandberg patched a critical threading bug in turbopack's scope_and_block primitive that could cause builds to hang under load.

The fix routes all jobs through a single shared work queue instead of spawning exclusive worker tasks [1], eliminating a race condition where completion depended on scheduler timing. In parallel, Sandberg removed the synthetic turbopack-build-events trace span and simplified tracing to use `next build` as the parent, making trace reporting more reliable since spans no longer report zero duration [2]. Separately, Sam Poder closed a hole where constants with values referencing other values were incorrectly treated as side-effect free, a regression from earlier this year that could have broken optimizations [3]. Across the stack, 5 commits and 4 PRs landed in a single release cycle.

Action items

→ Pull the latest next.js from main to get the scope_and_block deadlock fix in your local builds vercel/next.js [immediate]
→ Monitor your build traces in production to confirm span reporting is cleaner post-simplification vercel/next.js [monitor]

References

[1] [turbopack] Fix a potential deadlock in scope_and_block ↗ vercel/next.js
[2] Remove the turbopack-build-events trace span, use `next build` instead (#96746) vercel/next.js
[3] [turbopack] Treat constants with values referencing other values as unsafe (#96190) vercel/next.js

Quick answers

What shipped in Vercel on August 9, 2026?: Luke Sandberg patched a critical threading bug in turbopack's scope_and_block primitive that could cause builds to hang under load. In total, 5 commits, 4 pull requests, and 1 releases landed.
Who contributed to Vercel on August 9, 2026?: 2 developers shipped this update, including lukesandberg and sampoder.
What were the notable Vercel updates?: [turbopack] Fix a potential deadlock in scope_and_block, Remove the turbopack-build-events trace span, use `next build` instead (#96746), and [turbopack] Treat constants with values referencing other values as unsafe (#96190).

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