Re: [coLinux-devel] Stability and the Gentoo image

[Dan A. <da...@gm...>]

On Wed, Feb 18, 2004 at 12:22:44AM +0200, Dan Aloni wrote:

> I've temporarily hidden away the Gentoo image that Pat released last 
> week from the sourceforge page due to instabilities of that image 
> running under the latest coLinux version. The image itself is not to 
> blame. Currently, both Linux kernel and userspace code compiled with 
> -march=i686 that runs under coLinux may cause the host machine to 
> spontaneously reboot. 

I am pleased to tell that I finally got this fixed a few minutes ago. 
It wasn't actually i686 releated, but it was caused indirectly by the 
i686-optimized pthreads library, that uses modify_ldt() in order to 
implement TLS (thread local storage) using the %gs register. The fix 
was quite easy: wrap the switch code with safe preservation of %gs and 
%fs, so if either one of them is invalid, we won't get a GPF in the 
switch code itself, and instead just sllently nullify the register.

Another instability issue behind us.

-- 
Dan Aloni
da...@gm...