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From: Laurenz Albe <[email protected]>
To: Peter Röthlisberger <[email protected]>
To: [email protected]
Subject: Re: undefined symbol: PQcancelStart
Date: Fri, 20 Jun 2025 14:00:17 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On Fri, 2025-06-20 at 13:49 +0200, Peter Röthlisberger wrote:
> Hello all,
> 
> Platform: Rocky Linux release 9.4 (Blue Onyx)
> 
> I try to migrate from version 16.7 to 17.5. When executing pg_upgrade —check I get the following:
> 
> 
> could not load library "$libdir/dblink": ERROR:  could not load library "/opt/postgresql-17.5/lib/dblink.so": /opt/postgresql-17.5/lib/dblink.so: undefined symbol: PQcancelStart
> In database: zen_dev1
> In database: zen_prod2
> could not load library "$libdir/postgres_fdw": ERROR:  could not load library "/opt/postgresql-17.5/lib/postgres_fdw.so": /opt/postgresql-17.5/lib/postgres_fdw.so: undefined symbol: PQcancelStart
> In database: zen_dev1
> 
> I  tried hard to find a hint on the net. No success hence my first post here. I was able to execute the update on another server having the same OS.

How did you install "dblink.so" and "postgres_fdw.so"?
It looks like you copied them from the old installation.  That won't work.

Yours,
Laurenz Albe

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