[Ksummit-2012-discuss] [ATTEND] kernel core dump and "dying breath"

David Howells dhowells at redhat.com
Tue Jun 26 12:48:37 UTC 2012

H. Peter Anvin <hpa at zytor.com> wrote:

> > Well, I think `prototype' is a bit strong but we did take a look at the
> > feasibility of using QR codes for backtraces. The two problems were:
> >
> >    1. Even without any error correction, the QR code started to get pretty
> >       large (and unreadable) after more than a few lines of backtrace. This
> >       should be fairly easy to fix by encoding the data in a more sensible
> >       manner rather than just verbatim (especially since a backtrace is
> >       a well-structured log). Maybe you could even gzip the whole thing
> >       after that too (then sell an android app to gunzip it :p)
> Yes, this is the problem... the QR spec allows for large symbols, but unless
> you can find at least *one* decoder which can *reliably* decode large symbols
> photographed under non-ideal circumstances this is all academic.

Why try and show it all with one huge QR?  Could you not split it into smaller
pieces and show each as a separate QR, say on a 3×2 grid?


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