5febb0963998c40d7ddd8e71d9f9abe6feaea7ca
Fluid sims have a very nasty feature for interaction, in which a psys can directly update the bvhtree for //another object's psys//. This breaks with threaded depsgraph evaluation and is generally a no-go. To avoid crashes for now, use a global mutex to avoid concurrent writes to an object psys' bvhtree.
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