Date: Thu, 4 Jan 2018 00:46:00 +0100
From: Lars Wendler <wendler.lars@web.de>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>, x86@kernel.org,
        Borislav Betkov <bp@alien8.de>,
        Andy Lutomirski <luto@kernel.org>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Greg KH <gregkh@linuxfoundation.org>,
        Laura Abbott <labbott@redhat.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Juergen Gross <jgross@suse.com>
Subject: Re: CONFIG_PAGE_TABLE_ISOLATION=y on x86_64 causes gcc to segfault
 when building x86_32 binaries
Message-ID: <20180104004600.316aaab5@abudhabi.paradoxon.rec>
In-Reply-To: <alpine.DEB.2.20.1801031949200.1957@nanos>
References: <20180103123723.1dd26828@abudhabi.paradoxon.rec>
        <alpine.DEB.2.20.1801031256440.1957@nanos>
        <alpine.DEB.2.20.1801031259530.1957@nanos>
        <20180103143036.60e592eb@abudhabi.paradoxon.rec>
        <alpine.DEB.2.20.1801031620020.1957@nanos>
        <alpine.DEB.2.20.1801031949200.1957@nanos>
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Am Wed, 3 Jan 2018 19:52:04 +0100 (CET)
schrieb Thomas Gleixner <tglx@linutronix.de>:

> On Wed, 3 Jan 2018, Thomas Gleixner wrote:
>=20
> > On Wed, 3 Jan 2018, Lars Wendler wrote: =20
> > > Am Wed, 3 Jan 2018 13:05:38 +0100 (CET)
> > > schrieb Thomas Gleixner <tglx@linutronix.de>: =20
> > > > Also can you please try Linus v4.15-rc6 with PTI enabled so we
> > > > can see whether that's a backport issue or a general one? =20
> > >=20
> > > Same problem with 4.15-rc6. So I suppose that means it's a general
> > > issue. =20
> >=20
> > Just a shot in the dark as I just decoded another issue on a AMD
> > CPU. Can you please try the patch below? =20
>=20
> Ok. Found the real issue. This is a problem on AMD boxen.
>=20
> Fix below.
>=20
> Can Xen folks please have a look at that as well?
>=20
> Thanks,
>=20
> 	tglx

That indeed fixes the issue. Thank you!

Kind regards
Lars

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