Andrew Morton wrote:
> vmm:/home/akpm# echo 1 > /proc/sys/vm/vdso_enabled 
> vmm:/home/akpm# 
> vmm:/home/akpm> ls -l
> zsh: segmentation fault  ls -l
>
>   
>> That could tell us whether 
>> it's an init bug or a glibc bug.
>>     
>
> It tells us neither.  This could be a new kernel bug which only certain old
> userspace setups are known to trigger.  Until we know exactly why this is
> occurring, we don't know where the bug is.
>
> And once we've worked that thing out, and if we determine that the bug is
> in userspace then we might be able to craft the patch in such a fashion
> that the old userspace continues to work, which would be a win.
>   

Please try my patch - sent earlier, but attached again.  It will tell 
you with 100% confidence if the problem is with userspace expecting the 
vsyscall page to be at a particular address.