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SubjectRe: Regression: unable to boot after commit bd9240a18edf ("x86/apic: Add TSC_DEADLINE quirk due to errata") - Surface Pro 4 SKL
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On Tue, 2017-11-28 at 10:34 +0100, Thomas Gleixner wrote:
> On Tue, 28 Nov 2017, Zhang Rui wrote:
>
> >
> > On Tue, 2017-11-28 at 09:14 +0100, Peter Zijlstra wrote:
> > >
> > > On Tue, Nov 28, 2017 at 10:08:53AM +0800, Zhang Rui wrote:
> > > >
> > > >
> > > > Hi, All,
> > > >
> > > > My Surface Pro 4 is unable to boot after 4.12. The symptom is
> > > > that
> > > > kernel freezes during boot, and the last message in the screen
> > > > is
> > > > loading the initrd image. And I have bisected it to this commit
> > > >
> > > > +// DEADLINE_MODEL_MATCH_REV (
> > > > INTEL_FAM6_SKYLAKE_MOBILE,
> > > > 0xb2),
> > > And what microcode version do you run? Have you installed the
> > > latest
> > > microcode package and updated your initrd to include it? My
> > > skylake
> > > is
> > > running 0xba.
> > No, I didn't upgrade my microcode.
> >
> > $ cat /proc/cpuinfo
> > ...
> > processor : 0
> > vendor_id : GenuineIntel
> > cpu family : 6
> > model : 78
> > model name : Intel(R) Core(TM) i7-6650U CPU @ 2.20GHz
> > stepping : 3
> > microcode : 0x9e
> > ...
> >
> > I suppose the problem should be gone if I upgrade the microcode.
> > But the real problem to me is that the system FREEZES after kernel
> > upgrade.
> Confused. So the match disables the deadline timer due to 0x9e <
> 0xb2. And
> not having deadline timer makes the boot fail despite the fact that
> deadline timer is borked with microcode < 0xb2.
>
> Can you verify by adding 'lapic=notscdeadline' to the command line of
> a
> 'working' kernel? That should cause a freeze as well then.
>
yes. Tried 4.4 distro and 4.12 vanilla kernel, kernel always freezes
with boot option "notscdeadline"/"lapic=notscdeadline".

thanks,
rui

> Thanks,
>
> tglx

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