After I have recently upgraded to debian 12 (bookworm), trying to call mpich
with the script mpif90, I
get a long series of errors (both with gfortran and ifort - in the latter case
with FC="ifort"), basically
a multiplication of the following sequence:
------
/usr/bin/ld: /usr/lib/x86_64-linux-gnu/libmpich.a(lib_libmpich_la-pready.o):
in function `PMPI_Pready':
(.text+0x7b3): undefined reference to `ucp_am_send_nb'
/usr/bin/ld: (.text+0x7e7): undefined reference to `ucp_request_release'
/usr/bin/ld: (.text+0xb68): undefined reference to `ucs_status_string'
-------

Hi,
I confirm a problem in upgrading mpich from debian bullseye to bookworm.

In fact is also appeared on another independent system I upgraded.

It seems to me (though, since I did many attempts I am not 100% sure) that it
is due to errors in the wrapper and binary files installed in /usr/bin (eg.
mpifort etc.). In fact, at once I found installed the openmpi wrapper files
(all binary files, coming from the package openmpi-bin) instead of the
corresponding mpich files (text files). This in spite of the fact that I never
tried to install openmpi. I do not know if openmpi-bin was required by some
other package.
Apparently, I resolved with the following:

uninstalled openmpi-bin
reinstalled mpich

This worked!

We believe that the bug you reported is fixed in the latest version of
mpich, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1042412@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Alastair McKinstry <mckinstry@debian.org> (supplier of updated mpich package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Mon, 25 Aug 2025 10:29:18 +0100
Source: mpich
Architecture: source
Version: 4.3.1-3
Distribution: unstable
Urgency: medium
Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
Changed-By: Alastair McKinstry <mckinstry@debian.org>
Closes: 1042412
Changes:
 mpich (4.3.1-3) unstable; urgency=medium
 .
   * Disable pmix - breaks with pmix 6.0.0, ditto hip
   * Close old bug: Closes: #1042412
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