Re: debugging 15.0-RELEASE kernel on 15.0p3?

On Tue, Feb 17, 2026 at 12:37 PM Michael W. Lucas <[email protected]> wrote:
>
> Hi,
>
> I got my first kernel panic in ten years! (Was attempting to add a 32nd
> zvol-backed drive to a bhyve guest.)
>
> This host didn't have kernel debug symbols. I went to install them and
> discovered my host needed updates. Thoughtlessly, I grabbed the new
> kernel and the new symbols.
>
> Oops. You can't debug a 15.0 kernel on 15.0p3.
>
> bucket/var/crash;kgdb -n 0
> kgdb: couldn't find a suitable kernel image
>
> I have a 15.0 boot environment I could boot into, if there's a way to
> install the debugging symbols? Or is there a way to pull the old
> kernel and debug symbols down on the current BE?
>
> On dch's advice I tried setting the pkg.conf URL:
>   url:
> "pkg+https://cloudfront.aws.pkgbase.freebsd.org/FreeBSD:15:amd64/base_release_
> 0/"
> but got:
> pkg: No SRV record found for the repo 'FreeBSD-base'
>
>
> Thanks,
> ==ml
>
> PS: I shoulda just done make world, that way I'd have /boot/kernel.old. ;-)
>
>
>
> --
> Michael W.(Warren) Lucas        https://mwl.link/

You can probably install the symbols from the DVD image.  They're in
the kernel-dbg.txz dist set.  That should work for you, since your
crash happened in 15.0.  But the same technique wouldn't work if you
had crashed at, say, 15.0-p1.