Jeff Dike wrote:
On Mon, Mar 19, 2007 at 10:00:49AM +0100, Jacques-Charles Lafoucriere wrote:
  
I am trying to build and run a UML 2.6.18 machine on a FC6 host. 
(2.6.18-1.2798)
    

Why are you insisting on a 2.6.18 UML?
  
I work on some  kernel product that will be available on RHEL5 which uses 2.6.18
And RHEL5 kernel does not work in the UML target, so a vanilla 2.6.18 is the closest kernel
I want to avoid a 2.6.20 or later port of the product

  
I have tried many patches from the list and was not able to be successful
(hang after VFS: Mounted root (ext3 filesystem) readonly.)
    

Try 2.6.21-rc4 or this patch:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff_plain;h=14251809b1921b1216568700f1be2f91a1cbb5c7
  
Ok I will try