[systemd-devel] Does coredumpctl info support minidebuginfo / gnu_debugdata ?

[Etienne Cordonnier]

Thanks for your reply. I have tested with Fedora 39 and indeed coredumpctl
info shows function names when a binary provided by a Fedora package
crashes. However, when I compile a test binary on Fedora, even with debug
symbols enabled (I tried -g and -ggdb), and I then send kill -SEGV my
binary, coredumpctl info shows "n/a" instead of the function names of my
test binary. I also tried to inject minidebuginfo into my binary file with
the same result.

Do you know what I should do so that coredumpctl info also works with
binary files I compile? (I added full reproduction steps including the code
of this test binary to
https://unix.stackexchange.com/questions/761966/how-to-get-symbolized-call-stacks-with-coredumpctl-info
).

Etienne

On Fri, Nov 17, 2023 at 10:03 AM Lennart Poettering <lennart at poettering.net>
wrote:

> On Do, 16.11.23 18:37, Etienne Cordonnier (ecordonnier at snap.com) wrote:
>
> > Hello,
> > I am testing a yocto based system, where it seems that "coredumpctl info"
> > isn't able to use minidebuginfo / gnu_debugdata to extract a symbolized
> > call-stack. I saw in the code that coredumpctl uses elfutils / libdwfl in
> > order to extract a call-stack, and as far as I understand libdwfl
> supports
> > minidebuginfo since this commit (
> >
> https://urldefense.proofpoint.com/v2/url?u=https-3A__sourceware.org_git_-3Fp-3Delfutils.git-3Ba-3Dcommit-3Bh-3D5083a70d3b64946fa47ea5766943a15a3ecc6891&d=DwIBAg&c=ncDTmphkJTvjIDPh0hpF_4vCHvabgGkICC2epckfdiw&r=AhkbNonVuMIGRfPx_Qj9TsRih1DULJTKUkSGa66m67E&m=HRBTXvbd-s9li256Vbbs9zIn33TULJrpWyLD4WV4rEtaedXG1zYgtpXt1vN3eolJ&s=WjU-C5bJAjCxwlzGD-CwjTBUFN_ZEr7Z1pFNC54_HU0&e=
> > ).
> >
> > Is there a configuration / build-option / etc. to enable support for
> > minidebuginfo in coredumpctl? If no is it on the roadmap? The advantage
> of
> > minidebuginfo is that it is much smaller than full debug symbols.
>
> Fedora has been using minidebuginfo since ~10y or so, and
> coredumctl/libdwfl has been working fine with it. So it certainly
> works, it's how this all works on my local machine since forever.
>
> Maybe ask your distro for help, it's generally an integration issue of
> distributions i this doesn't work.
>
> Lennart
>
> --
> Lennart Poettering, Berlin
>
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