linux-kernel - Re: 32bit binaries on x86_64/Xen segfaults in syscall-vdso

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Message-ID: <4AA02C57.30106@goop.org>
Date:	Thu, 03 Sep 2009 13:51:35 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Bastian Blank <waldi@...ian.org>, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com, 544145@...s.debian.org,
	Keir Fraser <keir.fraser@...citrix.com>
Subject: Re: 32bit binaries on x86_64/Xen segfaults in syscall-vdso

On 08/30/09 11:16, Bastian Blank wrote:
> Hi folks
>
> I upgraded one of my 32bit chroots on a x86-64 machine runing under Xen
> lately. All binaries started to segfault. Some extensive checks later
> show the vdso as the culprit. Later I found <gpe0vg$j67$1@....gmane.org>
> with the same problem. The full story can be found in the Debian bug
> 544145[1].
>
> It happens with Linux 2.6.30 and 2.6.31-rc8 on Xen 3.2 and 3.4.
>
> For the tests I set the vdso to compat mode to have it loaded on a fixed
> location.
>
> The following program is a minimal test case for the vdso in compat
> mode, it can be compiled against dietlibc to minimize other effects.
>   

Is this an AMD machine?  Does booting with vdso32=0 on the kernel
command line work around the problem?

     J
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