Re: drgn 0.0.30 and libkdumpfile 0.5.5 incompatibility in Arch

Christian Heusel <[email protected]> Thu, 2 Jan 2025 09:57:52 +0100
Newsgroups	org.kernel.vger.linux-debuggers
Message-ID	<[email protected]>
On 25/01/02 12:31AM, Stephen Brennan wrote:
> Stephen Brennan <[email protected]> writes:
> > Hi Christian,

Hey Stephen,

> >
> > I think you may already be aware of this, but I wanted to let you know
> > that there's an incompatibility with drgn 0.0.30-2 and libkdumpfile
> > 0.5.5-1 on Arch. libkdumpfile 0.5.5 changed some APIs in a
> > backward-incompatible way. Building drgn against the new version fails,
> > and running a version built against 0.5.4 of course fails due to the
> > soname change. The current drgn 0.0.30-2 on Arch's repositories was
> > built against 0.5.4.

I was not yet aware of this!

> >
> > Thus a user installing drgn & libkdumpfile on Arch, who is fully
> > up-to-date, gets this:
> >
> > ImportError: libkdumpfile.so.10: cannot open shared object file: No such file or directory
> >
> > The incompatibility is fixed in drgn's main branch by the changes in
> > [1]. Unfortunately, that was merged after drgn 0.0.30 was released.
> > Some major changes have been merged since then, so I don't think a
> > 0.0.31 release is likely for a few months. So I think it may be a good
> > idea to carry the two commits in [1] as downstream patches in a new
> > 0.0.30-3 release. I'd be happy to implement those changes if it'd help.
> >
> > I'm Ccing the linux-debuggers mailing list for posterity, as well as
> > Omar and Petr as an FYI.
> >
> > Thanks,
> > Stephen
> >
> > [1]: https://github.com/osandov/drgn/pull/452
> 
> 
> Sorry, I was a bit mistaken here:
> 
> 1. drgn 0.0.30 DOES build successfully with libkdumpfile 0.5.5. I
> misread the changes there. As far as I can tell, there may be a small
> memory leak when using 0.0.30 with 0.5.5, but nothing major.
> 
> 2. I'd say the best way forward would be a simple rebuild of drgn
> against libkdumpfile 0.5.5.
> 
> Thanks,
> Stephen

thanks for your report and suggestions to fix the underlying issue! It
turns out I somehow missed the soname bump in libkdumpfile's last
release (also I'm a bit annoyed that it had one in a patch release)
... 😅

Sorry for any trouble this has caused you, this should be fixed with
drgn 0.0.30-3! Additionally to the rebuild I included the patch you
suggested at first, as it applied easily and fixes the lifetime issue!

Cheers,
Chris
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