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Alexey MilovidovandClaude Opus 4.8
d1038006e9
The previous bump (cb6b5c9) made the per-codec dispatch function pointers
(`crc32_impl`, `adler32_impl`, ...) atomic, but each dispatcher still calls
`get_x86_cpu_features` / `get_arm_cpu_features`, which lazily initialize the
global `libdeflate_x86_cpu_features` / `libdeflate_arm_cpu_features` bitmask on
the first call. That global was only `volatile`, so a plain load racing with
the store in `libdeflate_init_*_cpu_features` is still undefined behavior and
was flagged by ThreadSanitizer:
WARNING: ThreadSanitizer: data race
Write ... libdeflate_init_x86_cpu_features cpu_features.c:210
Read ... get_x86_cpu_features cpu_features.h:62
Location is global 'libdeflate_x86_cpu_features'
It reproduced as a "Server died" failure under TSan when two HTTP connections
first compressed a gzip error response concurrently (e.g.
`test_profile_max_sessions_for_user` on the amd_tsan integration shard).
The global is now accessed with relaxed `__atomic_load_n` / `__atomic_store_n`,
matching the dispatch-pointer fix. Fork commit:
https://github.com/ClickHouse/libdeflate/commit/ec0718b
Related: https://github.com/ClickHouse/libdeflate/pull/5
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
ClickHouse® is an open-source column-oriented database management system that allows generating analytical data reports in real-time.
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