https://github.com/postgres/postgres
Since its introduction, pg_get_expr() has intended to silently return NULL if called with an invalid relation OID, as can happen when scanning the catalogs concurrently with relation drops. However, there is a race condition: we check validity of the OID at the start, but it could get dropped just afterward, leading to failures. This is the cause of some intermittent instability we're seeing in a proposed new test case, and presumably it's a hazard in the field as well. We can fix this by AccessShareLock-ing the target relation for the duration of pg_get_expr(). Since we don't require any permissions on the target relation, this is semantically a bit undesirable. But it turns out that the set_relation_column_names() subroutine already takes a transient AccessShareLock on that relation, and has done since commit 2ffa740be in 2012. Given the lack of complaints about that, it seems like there should be no harm in holding the lock a bit longer. Back-patch to all supported branches. Discussion: https://postgr.es/m/31ddcc01-a71b-4e8c-9948-01d1c47293ca@eisentraut.org
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- d21690edbf414582f7f20c26bb355d49cbbeb8a0
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Remove race condition in pg_get_expr().
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