linux-kernel - Re: [BUG]smt sysfs dir missing on 4.4.148 and 4.14.63

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Date:   Thu, 16 Aug 2018 18:28:59 +0200
From:   Jinpu Wang <jinpu.wang@...fitbricks.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        stable <stable@...r.kernel.org>, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>, konrad.wilk@...cle.com
Subject: Re: [BUG]smt sysfs dir missing on 4.4.148 and 4.14.63

On Thu, Aug 16, 2018 at 5:51 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Thu, Aug 16, 2018 at 05:43:23PM +0200, Jinpu Wang wrote:
> > Hi Greg, hi Thomas,
> >
> > I noticed /sys/devices/system/cpu/smt dir is missing on 4.4.148 and
> > 4.14.63, default setting.
>
> For 4.4, I would be amazed if anything was there, the backport was done
> only to handle the local user issue, not the "full" protection.  So
> please try 4.9 or 4.14.
Thanks for quick reply. Right, just checked. the patch for create the
sysfs entry is missing.
>
> How about 4.17 and 4.18, do those trees work properly for you?
I guess it's the same.
>
> > Tried stable/master branch 31130a16d459 ("Merge tag
> > 'for-linus-4.19-rc1-tag' of
> > git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip")
> > It's the same there.
>
> Ah, so we are bug compatible, good :)
I will try test stable master a bit more to gather the full log.
>
> > When boot with 'nosmt' kernel paramter kernel 4.14.63 panic during
> > boot, 4.4.148 boot fine.
> > The call trace seem irq related, is it known bug?
>
> You are not giving us much to go on here sorry.  We need full details,
> and also please cc: lkml and the other developers who worked on this.
> THomas is on vacation this week.
Now, add more developers to cc, also lkml.

I have the config and boot dmesg attached for default setting.
>
> thanks,
>
> greg k-h

Thanks,

--
Jack Wang
Linux Kernel Developer

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View attachment "4.14.63.txt" of type "text/plain" (87821 bytes)

Download attachment "config-4.14.63" of type "application/octet-stream" (116381 bytes)