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Andrew Kelley
d210f733f8
In end(), the freelist pointer is owned so the bare store would be ok. However, there is a load in start() that can happen at the same time, if another start() and end() pair grabs that same index. I don't think this fixes #21663 actually because even if the data race corrupts the value for `next`, the cmpxchg protects the value from being stored there.