Re: Corrupt btree index includes rows that don't match

On Fri, Jul 4, 2025 at 5:50 AM <shammat@gmx.net> wrote:

> > One coincidence is that we started seeing the first symptoms of this
> > around the same time as libicu was updated with a security patch.
> > However, postgres hasn’t been restarted and doesn’t reference the
> > new version in its process maps. Plus state groups are integers
> > anyway. We also use the C locale, not ICU.
> Sounds as if you are hit by locale changes:
>
> https://wiki.postgresql.org/wiki/Locale_data_changes
>
>
> I think you will need to upgrade to prevent future problems like that:
>
> Postgres 15 introduced some mechanisms to track and validate version
> discrepancies after an OS update.
>
> Postgres 17 added a "built-in" collation provider which is independent of
> glibc
>

Why?  Locale only cares about strings, and "Plus state groups are integers
anyway."

Besides, "We also use the C locale, not ICU."

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