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During allocation VALGRIND_MAKE_MEM_DEFINED was called with a pointer as size. That kind of works, but makes valgrind exceedingly slow for workloads involving the slab allocator. Secondly there was an access to memory marked as unreachable within SlabCheck(). Fix that too. Author: Tomas Vondra Discussion: https://postgr.es/m/a6543b6d-6015-99b1-63ef-3ed55a76a730@2ndquadrant.com