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bin: Hold the state lock while removing elements from a bin
We need to take the state lock here to ensure that we're not currently just before setting the state of this child element. Otherwise it can happen that we removed the element here and e.g. set it to NULL state, and shortly afterwards have another thread set it to a higher state again as part of a state change for the whole bin. When adding an element to the bin this is not needed as we require callers to always ensure after adding to the bin that the new element is set to the correct state.
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