Re: [ptxdist] Regenerating debug files for debugging a core dump

[Roland Hieber <rhi@pengutronix.de>]

On Wed, May 26, 2021 at 11:31:56AM +0200, Michael Olbrich wrote:
> Hi,
> 
> On Tue, May 25, 2021 at 04:43:54PM +0200, Guillermo Rodriguez Garcia wrote:
> > I am trying to debug a core dump from a system based on ptxdist-2018.05.0.
> > 
> > I see that the debug symbols are generated in
> > platform-xxx/root/usr/lib/debug.
> > 
> > The thing is that I don't have the original debug files anymore.
> > If I regenerate the root fs and everything else from the same sources
> > (ptxdist clean + ptxdist go), will the generated debug files be valid for
> > debugging the core dump?
> 
> It may or may not work. PTXdist tries to make builds reproducible. But
> there are cases where it does not work and the resulting binaries are
> different.
> So it's worth a try if you don't have the debug files any more, but it's
> better to keep them to avoid relying on this.

Hmm, if the package does not build reproducibly, its build ID will
change, so gdb won't find the debug symbols automatically. But does that
also mean that the debug symbols cannot be loaded into gdb manually? If
the BSP was built from exactly the same sources (even without
reproducibility) most other data layouts, file names and line numbers
should still be the same, right?

 - Roland

-- 
Roland Hieber, Pengutronix e.K.          | r.hieber@pengutronix.de     |
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