linux-kernel - Re: lapic-related boot crash in 4.15-rc1

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Date:   Mon, 15 Jan 2018 17:21:22 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Meelis Roos <mroos@...ux.ee>
cc:     Ingo Molnar <mingo@...hat.com>,
        Linux Kernel list <linux-kernel@...r.kernel.org>,
        x86@...nel.org
Subject: Re: lapic-related boot crash in 4.15-rc1

On Mon, 15 Jan 2018, Meelis Roos wrote:

> On Wed, 10 Jan 2018, Thomas Gleixner wrote:
> 
> > On Wed, 10 Jan 2018, Meelis Roos wrote:
> > 
> > > > > On 3 of my test computers, boot hangs with 4.15 git kernels. So far I 
> > > > > have traced it down to 4.14.0 being good and 4.15-rc1 being bad (bisect 
> > > > > is slow because the computers are somwehat remote). Also because of 
> > > > > trying to find when it started, I have not tries newer than rc5 
> > > > > kernels.
> > > > 
> > > > Please do so. We have fixes post rc5 in that area.
> > > 
> > > P4 was the quickest to rebuild the kernel and it is still hanging like 
> > > before with todays 4.15-rc7-00102-gcf1fb158230e.
> 
> So far I have bisected it to 4f45ed9f848f good, ae41a2a40ed4 bad. Will 
> continue tomorrow.
> 
> 1be2172e96e3 bad
> 2cd83ba5bede bad
> 449fcf3ab0ba bad
> 43ff2f4db9d0 good
> 313144c1bcd6 good
> b18d62891aaf bad
> b24591e2fcf8 good
> 0696d059f23c bad
> 023a611748fd bad
> ae41a2a40ed4 bad
> 4f45ed9f848f good

I've reverted the commit which Dou pointed out in rc8. Can you please confirm that
this fixes the issue for you?

Thanks,

	tglx