[Debian-med-packaging] Bug#975511: segfaults on s390x

[Christian Ehrhardt]

Package: clustalo
Version: 1.2.4-6

Hi,
as initially found and discussed on Launchpad/Ubuntu [1] there is a
segfault of clustalo on s390x.
So far it didn't hit you on your s390x builds [2] but it seems pretty
reliable for us already and on a rebuild in Debian unstable I've hit
it as well. It is triggered by the new self-test after build in
1.2.4-6.

The underlying root cause was identified in [3] which I also reported
to upstream and the Debian Med Team as mail. We now have three
options:

- wait for upstreams stance on the suggested change
- switch optimization to -O0 on s390x which avoids the issue for now
- apply the suggested patch without upstream commenting on it

This is up to you to decide what you prefer and I last week already
opened an MR for it [4].

[1]: https://bugs.launchpad.net/ubuntu/+source/clustalo/+bug/1903817
[2]: https://buildd.debian.org/status/architecture.php?a=s390x&suite=sid
[3]: https://bugs.launchpad.net/ubuntu/+source/clustalo/+bug/1903817/comments/15
[4]: https://salsa.debian.org/med-team/clustalo/-/merge_requests/1

-- 
Christian Ehrhardt
Staff Engineer, Ubuntu Server
Canonical Ltd