linux-kernel - Re: kexec reboot fails with extra wbinvd introduced for AME SME

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180118033118.GA1838@dhcp-128-65.nay.redhat.com>
Date:   Thu, 18 Jan 2018 11:31:18 +0800
From:   Dave Young <dyoung@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Arjan van de Ven <arjan@...ux.intel.com>,
        Yu Chen <yu.c.chen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Juergen Gross <jgross@...e.com>,
        Tony Luck <tony.luck@...el.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Borislav Petkov <bp@...en8.de>,
        Rui Zhang <rui.zhang@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        Kexec Mailing List <kexec@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ebiederm@...hat.com, Tom Lendacky <thomas.lendacky@....com>,
        Baoquan He <bhe@...hat.com>
Subject: Re: kexec reboot fails with extra wbinvd introduced for AME SME

On 01/18/18 at 11:04am, Dave Young wrote:
> On 01/17/18 at 07:00pm, Linus Torvalds wrote:
> > On Wed, Jan 17, 2018 at 6:57 PM, Dave Young <dyoung@...hat.com> wrote:
> > >
> > > Could you say more about how to check this? My .config disabled
> > > CONFIG_X86_MCE, should this be enabled?
> > 
> > By all means, try it.
> > 
> > Some pending machine check exception that we have *not* reacted to,
> > and that is pending around kexec boot could very possibly be relevant.
> > 
> > I forget your exact symptoms. Was it that the _first_ kexec works, but
> > the second one hangs? Or was that the other unrelated issue? Or have I
> > confused this with some other report entirely?
> 
> Yes, 1st kexec works, 2nd hangs.
> 
> Rebuilding with MCE enabled now.

dmesg only shows "mce: CPU supports 7 MCE banks"
Nothing special happens with MCE enabled , anyway thank all for
the hints, I will continue to think about this and maybe try more experiments.

> 
> Thanks
> Dave
> > 
> >                Linus