Re: [tboot-devel] TBOOT 1.8.3 fails to resume from S3

[Ross P. <ros...@gm...>]

On 09/11/2015 08:20 PM, Sun, Ning wrote:
> Actually system resumes from S3 timely in tboot, but I/O (keyboard, mouse, video) looks blocked for seconds in kernel, need more investigations...

When S3 works, it is very timely but that is not the issue. I noted in 
another reply to this thread that when I remove these 2 change sets, the 
hang and subsequent system reset do not happen:

http://hg.code.sf.net/p/tboot/code/rev/9040e000ccc4
http://hg.code.sf.net/p/tboot/code/rev/78713e04bdd9

It is very clearly related to these. I also stated that our suspicion is 
a buffer overflow in or related to this code:

http://hg.code.sf.net/p/tboot/code/rev/9040e000ccc4#l3.62

We do have the logging level set to "all".

Thanks
Ross

>
> Thanks,
> -ning
>
> -----Original Message-----
> From: Ross Philipson [mailto:ros...@gm...]
> Sent: Thursday, September 10, 2015 12:36 PM
> To: tbo...@li...
> Subject: [tboot-devel] TBOOT 1.8.3 fails to resume from S3
>
> I have been working on moving our project from TBOOT 1.7.0 to 1.8.3. I have discovered that while our 1.7.0 version of TBOOT resumes from S3 just fine, 1.8.3 does not.
>
> The most common symptom seems to be a hang just after TBOOT enters SMX mode. The hang happens at different places so I don't think it is one specific thing that TBOOT is doing to cause the hang. The hang can be short (on the order of seconds) or longs (several minutes). Then suddenly the platform will "unhang". It looks like the platform restarts quickly and goes right back in to TBOOT but it is a little hard to tell exactly what happens right around this point. We see this on every system we have tried it on.
>
> I have backed all our patches out and I still see the problem with a clean 1.8.3 code base. I have also tried using TBOOT with a Debian Jessie install and I get similar problems there. I have been comparing the code between the version and have so far not found anything that makes a difference.
>
> Any help in this matter is appreciated.
> Thanks
> --
> Ross Philipson
>
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-- 
Ross Philipson