Re: Location of modules with debug info

[Roberto Jung Drebes <drebes at gmail dot com>]

On 29/09/2009, at 00:54, Frank Ch. Eigler wrote:

> > So I guess stap is just trying to use the first one, without even
> > looking for the second. Is there any way I can specify the location?
>
> Hm, it seems as though the /usr/lib/debug copy is the original
> unstripped one, and snd.ko is simply stripped.  In Fedora land, we're
> more used to separated debuginfo (so /usr/lib/debug/lib/modules/.../
> ends up containing snd.ko.debug -- with only the .debug_* sections
> included).
>
> The stripped file probably doesn't have a ".gnu_debuglink" section
> (confirm with readelf -S), so elfutils doesn't know that it should
> bother looking in /usr/lib/debug for an alternative version.
> (Roland?)
>
> Regardless, if the /usr/lib/debug/lib copy of the module.ko is indeed
> complete (it has all the .text etc. sections), you could just
> overwrite the stripped copies in /lib/modules, and all should work.

I replaced the stripped module with the non-stripped one, and indeed  
my probe then works. If there's no way of specifying the alternate  
path, I think I'll just overwrite all modules with the debug ones.

Thanks for the help!

--
Roberto Jung Drebes - Tokyo, Japan
<drebes@gmail.com>
http://japao.drebes.org/