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[Xen-devel] Re: 32bit binaries on x86_64/Xen segfaults in syscall-vdso

To: Bastian Blank <waldi@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, 544145@xxxxxxxxxxxxxxx, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: [Xen-devel] Re: 32bit binaries on x86_64/Xen segfaults in syscall-vdso
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Thu, 03 Sep 2009 13:51:35 -0700
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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@xxxxxxxxxxxxx>
> 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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