[Sound-open-firmware] Questions about the SOF coredump reader

[Liam Girdwood]

On Fri, 2019-07-26 at 13:09 +0000, Paul Olaru wrote:
> Figured it out, I had to use the proper version of GCC, now the tool
> can properly parse panics. Still, I only get this info for actual
> panic() calls, for exceptions I see that the DSP hangs instead of
> calling the exception() handler.
> 
> From: Paul Olaru
> Sent: Wednesday, July 24, 2019 5:36 PM
> To: janusz.jankowski at linux.intel.com
> Cc: sound-open-firmware at alsa-project.org
> Subject: Questions about the SOF coredump reader
> 
> I'm trying to diagnose a few issues on the IMX platform and it would
> be nice if I would be able to interpret panics and exceptions. I have
> just fixed a minor issue so that the debugfs "exception" entry is
> correct.
> 
> I would like to know if the tool in sof/tools/coredumper/sof-
> coredump-reader.py is usable for interpreting such dumps and how it
> should be used. Right now, I have inserted a "panic" call in my code
> (that makes a dump which seems to be in the proper format), but
> whenever I try to run this tool on that
> /sys/kernel/debug/sof/exception file it gets exceptions (one about
> exccause and, if I remove the corresponding code, it messes up the
> pathname interpretation too, complaining about UTF-8 being invalid -
> I suspect wrong offsets?).
> 
> So, how is this tool supposed to be used?
> 

Fwiw, we have seen some differences with GCC compiled stack traces with
this tool. It seems XCC and GCC have some differences in window usage
which may confuse the tool. There is an issue on GH logged for this
that Kai was looking at before vacation.

Tool works perfectly with XCC compiled code.

Liam

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