[Bug 71238] [HSW ULT] Loop to test S4, system will call trace and network disconnect

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71238

--- Comment #1 from Ben Widawsky <ben at bwidawsk.net> ---
(In reply to comment #0)
> Created attachment 88658 [details]
> Image of  Call trace
> 
> Environment:
> -------------------
> Kernel: (drm-intel-next-queued)9d1cb9147dbe45f6e94dc796518ecf67cb64b359
> Author: Paulo Zanoni <paulo.r.zanoni at intel.com>
> Date:   Fri Nov 1 13:32:08 2013 -0200
>          drm/i915: avoid unclaimed registers when capturing the error state
> 
> Description:
> --------------------
> When I test s4 in a loop , the machine will resume with call trace and the
> network disconnect, and sometimes it will also hang at the same time. It may
> happen at the 5 or 6 round of the loop ,or more like 24 round . I add the
> picture of the call trace in the attachment.
> 
> Reproduce step:
> ----------------------
> 1.boot up machine 
> 2.echo 0 > /sys/class/rtc/rtc0/wakealarm ; 
>   echo +10 > /sys/class/rtc/rtc0/wakealarm; 
> 3.echo disk > /sys/power/state
> 4.loop running step 2 and 3

Can you please try to reproduce with a 30 second delay. In strange cases, I've
seen 10s not be enough.

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