Re: [uml-devel] buggy UML AMD64?

[Antoine Martin <antoine@nagafix.co.uk>]

Daniel Gryniewicz wrote:
> On Fri, 2007-01-19 at 11:00 +0000, Antoine Martin wrote:
>> Is anyone else having stability problems on AMD64? Or am I the only one 
>> using it?
>> Not only is x86 UML broken on AMD64, I am also getting (seemingly) 
>> random crashes running 64-bit UML.
>> The Gentoo guests in particular randomly fail to compile code - failing 
>> in completely random places. When you try again, it might work or just 
>> fail later when you run the binary...
>> These used to work reliably before so I am not just doing it wrong (as 
>> is often the case ;)
>> To summarize, that leaves us with:
>> * x86 unable to run kernels 2.6 due to a bug in host >2.6.16
>> (and most x86 guests require 2.6 to use latest glibc)
>> * amd64 unable to run x86 guests
>> * amd64 unable to run amd64 guests reliably
>> ...
>>
> 
> I'm the gentoo usermode-sources maintainer, and I run UML almost
> exclusively on amd64.  I have, at any given time, from 4 to 20 UMLs
> running on my main dev box, most of them 32-bit, and I haven't had any
> stability problems.
Can you send me more details of your setup as I am quite experienced 
with UML and now completely stuck with AMD64.

> Is your RAM OK?
Oh yes, this has nothing to do with the hardware.

> Which kernels do you have inside and outside?
Host (outside):
2.6.19.2-skas3-v8.2

Inside: pick any of those (none of them work with >=2.6.16):
http://uml.nagafix.co.uk/

>  How are
> you trying to build the 32-bit UMLs?
These are the same as on the site above (which I maintain) and these 
have worked flawlessly for a long long time.

I have downgraded the x86 boxes to 2.6.15.7 and these are up and running 
again. But I can't do that for all of them, and this is just not an 
option for some of the amd64 boxes.

Thanks
Antoine

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