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Date:   Thu, 30 Aug 2018 15:48:10 +0200
From:   Peter Zijlstra <>
To:     Siegfried Metz <>
Subject: Re: REGRESSION: boot stalls on several old dual core Intel CPUs

On Thu, Aug 30, 2018 at 03:04:39PM +0200, Peter Zijlstra wrote:
> On Thu, Aug 30, 2018 at 12:55:30PM +0200, Siegfried Metz wrote:
> > Dear kernel developers,
> > 
> > since mainline kernel 4.18 (up to the latest mainline kernel 4.18.5)
> > Intel Core 2 Duo processors are affected by boot stalling early in the
> > boot process. As it is so early there is no dmesg output (or any log).
> > 
> > A few users in the Arch Linux community used git bisect and tracked the
> > issue down to this the bad commit:
> > 7197e77abcb65a71d0b21d67beb24f153a96055e clocksource: Remove kthread
> I just dug out my core2duo laptop (Lenovo T500) and build a tip/master
> kernel for it (x86_64 debian distro .config).
> Seems to boot just fine.. 3/3 so far.
> Any other clues?

The .config from
seems to boot far enough to drop me into a busybox -- it doesn't seem to
contain enough bits to actually boot my system and I can't be arsed to
figure out what's missing.

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