BUG #15574: Upgrading postgis broke pg_dump

From: PG Bug reporting form <noreply(at)postgresql(dot)org>
To: pgsql-bugs(at)lists(dot)postgresql(dot)org
Cc: kop(at)meme(dot)com
Subject: BUG #15574: Upgrading postgis broke pg_dump
Date: 2019-01-04 18:48:03
Message-ID: 15574-cec279413ee434af@postgresql.org
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The following bug has been logged on the website:

Bug reference: 15574
Logged by: Karl Pinc
Email address: kop(at)meme(dot)com
PostgreSQL version: 10.6
Operating system: RHEL 7.6
Description:

On Jan 2 2019 upgraded to postgis24_10.x86_64 version 2.4.6-2.rhel7
from the pgdg10 repo.

Now, pg_dump gives me the following failure message:
pg_dump: [archiver (db)] query failed: ERROR: could not load library
"/usr/pgsql-10/lib/postgis-2.4.so": /usr/pgsql-10/lib/postgis-2.4.so:
undefined symbol: GEOSFrechetDistanceDensify

The following geos pacakges from pgdg10 repo were installed:
geos
geos36
geos37

Removing the geos36 package from the system resolved the problem.

I don't believe that we've ever manually installed geos packages,
although I could be wrong. I this this situation arose in the normal
course of doing "yum upgrade".

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