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Fix segfault when running JSON::unique() on different threads #1990

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Merged
merged 1 commit into from
Sep 30, 2025
Merged

Fix segfault when running JSON::unique() on different threads #1990

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6 changes: 4 additions & 2 deletions src/core/json/json_value.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -741,8 +741,10 @@ JSON::defines_any(std::initializer_list<JSON::String> keys) const -> bool {
return true;
}

static std::vector<std::uint64_t> cache;
cache.reserve(size);
// If we re-use the vector across threads, then we will segfault
thread_local std::vector<std::uint64_t> cache;
cache.clear();
cache.resize(size);

for (std::size_t index = 0; index < size; index++) {
cache[index] = items[index].fast_hash();
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