Debugging tools/approach for GPU hangs?

[Matt Zimmerman]

On Fri, Sep 04, 2009 at 10:17:02AM +0100, Chris Jones wrote:
> Hi
> 
> Matt Zimmerman wrote:
> >    Bryce (and Jesse Barnes at Intel) mentioned that the kernel is now
> >    supposed to log an error message when this happens, but I've never seen
> >    evidence of that happening.
> 
> I had an X wedge on resuming my laptop the other day and after SSHing in
> I found this in dmesg:
> 
> http://launchpadlibrarian.net/31253955/kernel.txt
> 
> (attached to https://bugs.launchpad.net/ubuntu/+source/linux/+bug/423362)

That's a symptom of this class of problem, yes.

> Is that the thing you're referring to? Having that kernel event trigger
> an automatic dump into /var/crash seems like it would be a massive win
> (cf my essentially useless bug report in the above case)

Yep, that's the idea.  We just need to add the necessary glue code to listen
for the uevent and run the hook.  I've prototyped this but haven't been able
to test it yet.

-- 
 - mdz