Horton

Re: Xact end leaves CurrentMemoryContext = TopMemoryContext

Anthonin Bonnefoy <anthonin.bonnefoy@datadoghq.com>

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From: Anthonin Bonnefoy <anthonin.bonnefoy@datadoghq.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Andres Freund <andres@anarazel.de>, David Rowley <dgrowleyml@gmail.com>, pgsql-hackers@lists.postgresql.org
Date: 2025-03-10T08:41:56Z
Lists: pgsql-hackers 
Hi,

This change seems to have introduced an issue where a deleted context
can be restored. This happens when a replication command exports a
snapshot since the transaction used is aborted at the start of the
next command. This leads to a memory context allocated with itself as
a parent and child, triggering an infinite loop when attempting to
delete it. I've written more details in a separate thread[1].

[1]: https://www.postgresql.org/message-id/flat/CAO6_XqoJA7-_G6t7Uqe5nWF3nj+QBGn4F6Ptp=rUGDr0zo+KvA@mail.gmail.com