From: Tomas Vondra <tomas.vondra@postgresql.org>
To: pgsql-committers@lists.postgresql.org
Subject: pgsql: Handle EPERM in pg_numa_init
Date: Thu, 20 Nov 2025 12:50:24 +0000
Message-ID: <E1vM47D-000TGv-2R@gemulon.postgresql.org> (raw)
Handle EPERM in pg_numa_init
When running in Docker, the container may not have privileges needed by
get_mempolicy(). This is called by numa_available() in libnuma, but
versions prior to 2.0.19 did not expect that. The numa_available() call
seemingly succeeds, but then we get unexpected failures when trying to
query status of pages:
postgres =# select * from pg_shmem_allocations_numa;
ERROR: XX000: failed NUMA pages inquiry status: Operation not
permitted
LOCATION: pg_get_shmem_allocations_numa, shmem.c:691
The best solution is to call get_mempolicy() first, and proceed to
numa_available() only when it does not fail with EPERM. Otherwise we'd
need to treat older libnuma versions as insufficient, which seems a bit
too harsh, as this only affects containerized systems.
Fix by me, based on suggestions by Christoph. Backpatch to 18, where the
NUMA functions were introduced.
Reported-by: Christoph Berg <myon@debian.org>
Reviewed-by: Christoph Berg <myon@debian.org>
Discussion: https://postgr.es/m/aPDZOxjrmEo_1JRG@msg.df7cb.de
Backpatch-through: 18
Branch
------
REL_18_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/482e98ac43022194fbf2ef0d8f6a68fe2516e54a
Modified Files
--------------
src/port/pg_numa.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
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To: pgsql-committers@postgresql.org
Cc: tomas.vondra@postgresql.org, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: Handle EPERM in pg_numa_init
In-Reply-To: <E1vM47D-000TGv-2R@gemulon.postgresql.org>
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