Re: [uml-devel] Problem with newer (>2.6.14) UML kernels hanging under Xen DomU/Centos 4.4

[Blaisorblade <blaisorblade@yahoo.it>]

On Saturday 18 November 2006 12:45, Matt Willsher wrote:
> I've been trying to get UML running under a Xen DomU running Centos
> 4.4, which I understand is a reasonable thing to do.
>
> When I started out I was using a download 2.6.12 kernel and the image
> booted up fine. I then tried 2.6.18.2, which is hanging after VFS:
> Mounted root (ext3 filesystem) readonly. I've had someone check my
> kernel and the image on another machine and it works without problem.
> I've tried some other kernels, and 2.6.14 seemed ok, 2.6.16 wasn't.
>
> I've had some problems with TLS under Xen running Berkely DB, so have
> rebuilt glibc with native threading disabled, but /lib/tls is still
> there because Bdb complains if it's removed.
>
> Below I've give the process list at the time, backtraces of each of
> these processes and the output of the ./linux ubd0=root_fs_router
> command.  Let me know if more output is required
>
> Any help is very much appreciated.

I have two suggestions for you to try:
* reduce CONFIG_HOST_VM_SPLIT for UML guest kernels (Xen consumes part of the 
available memory for UML, which causes crashes)

* try if booting with mode=tt helps - around 2.6.14 or 2.6.15 skas0 support 
was introduced (a very big change!) and become the new default, so that's the 
1st likely culprit.

-- 
Inform me of my mistakes, so I can add them to my list!
Paolo Giarrusso, aka Blaisorblade
http://www.user-mode-linux.org/~blaisorblade
Chiacchiera con i tuoi amici in tempo reale! 
 http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com 


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