[Bug 99025] [KVM][GVT-d] [BDW & SKL ]Ubuntu 16.04 guest boot up with kernel panic with the newest 4.9.0+ drm-intel kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99025

--- Comment #21 from Terrence Xu <terrence.xu at intel.com> ---
(In reply to Tomeu Vizoso from comment #20)
> (In reply to Terrence Xu from comment #19)
> > Created attachment 129619 [details]
> > dmesg-guest-full-20170214-drm-tip: 2017y-02m-14d-22h-44m-17s
> > 
> > Update the full guest dmesg log for drm-nightly-2017-02-14 version.
> 
> Thanks!
> 
> Today won't be able to get back to this, but in the meantime, could you
> please see what happens when you boot with i915.enable_rc6=0?
With the same result and the same error log as previously.
> Also, could you figure out which code line is causing the oops?
The null pointer is triggered by function "reset_common_ring" Line #1395 in
"intel_lrc.c", as below:
if (request->ctx !=port[0].request->ctx) , the port[0].request->ctx is Null.

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