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The case of "node == parent" might seem impossible, since we just allocated the new node. But it's possible if parent is a dangling reference to a recently-deleted context. In fact, given aset.c's habit of recycling contexts, it's actually rather likely if that's so. If we'd had this assertion before, it would have simplified debugging a recently-identified walsender issue. Reported-by: Anthonin Bonnefoy <anthonin.bonnefoy@datadoghq.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAO6_XqoJA7-_G6t7Uqe5nWF3nj+QBGn4F6Ptp=rUGDr0zo+KvA@mail.gmail.com