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

From: Jeremy Fitzhardinge
Date: Thu Sep 03 2009 - 16:51:43 EST

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?

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