Re: [Xen-devel] segfault in VM

[Derek Glidden <dglidden@xxxxxxxxxxxxxxx>]

On Jul 19, 2004, at 1:50 AM, James Harper wrote:

> where file3 and file4 are around 300mb files, and the vm has 128mb of 
> memory with no swap. This ensures that none of the file is cached so 
> there's lots of I/O.
>  
> When i've seen it crash most readily has been when i'm running a few 
> other domains and then start running dom0 out of memory, but nothing 
> conclusive yet.
>  
> I'll let this test keep running for another hour (otherwise idle, no 
> other domains running) or so then start my running-out-of-memory 
> program.
similarly, I can reproduce it reasonably reliably if I wait until all 
the VMs are busy either doing I/o or high CPU utilization and then I 
start dom0 doing lots of I/o either through an rsync or something along 
those lines.  If I let the system run for a little while to "prime" it, 
so far I think I can pretty much crash it whenever I want.
>  
> I wonder if it is coincidence that we both have smp boxes... each of 
> the domains only sees 1 cpu so I wouldn't have thought that would be a 
> problem unless there's a race in xen itself.
I have another, single-CPU, box that I can play with that I'll try to 
get to building and deploying Xen tonight and see if it makes any 
difference.
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