fix(fuzz): preserve pending corpus entries - #16067
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Prevent eviction from discarding entries that still need worker synchronization, while retaining normal eviction for invariant campaigns that do not participate in corpus sync.
mablr
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0xrusowsky,
DaniPopes,
figtracer,
grandizzy,
mattsse and
stevencartavia
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August 7, 2026 13:12
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✅ Changelog foundThe deterministic check will validate the changed entry. |
stevencartavia
approved these changes
Aug 7, 2026
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This follows up on #16058, which tracks corpus entries pending worker synchronization by index. Corpus eviction could remove a pending entry and its tracked index before it was delivered, allowing final synchronization to report success while silently losing the entry.
This prevents entries pending synchronization from being evicted. The protection is enabled only for stateless fuzz workers, since invariant campaigns do not use worker synchronization and must retain normal eviction behavior. Pending indices remain sorted, allowing eviction checks to use binary search without adding a linear lookup to the hot path.
The regressions verify that pending entries survive until worker fan-out while entries in non-synchronizing corpora remain evictable.