linux-kernel - Re: CONFIG_PAGE_TABLE_ISOLATION=y on x86_64 causes gcc to segfault when building x86

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Date:   Thu, 4 Jan 2018 00:46:00 +0100
From:   Lars Wendler <wendler.lars@....de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Borislav Betkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Laura Abbott <labbott@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>
Subject: Re: CONFIG_PAGE_TABLE_ISOLATION=y on x86_64 causes gcc to segfault
 when building x86_32 binaries

Am Wed, 3 Jan 2018 19:52:04 +0100 (CET)
schrieb Thomas Gleixner <tglx@...utronix.de>:

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

That indeed fixes the issue. Thank you!

Kind regards
Lars

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