Re: [Xen-devel] Unstableness in grant table block drivers

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Ian Pratt wrote:

> OK, that's news to us - we haven't seen any problems.
>
> It's been tested with dd's and kernel builds, and wasn't expected to be
> a particularly dangerous change.
>
> How you confirmed that disabling the option fixes your problems? Can you
> give a simple recipe to provoke problems?
We've had three different systems lose the ability to start domUs.  
Disabling VBD grant tables fixed the problem.  The best reproducable 
example we have is default config on a domU from today's xen-unstable 
snapshot.  /dev/console is not accessible and no valid root is found.
In my own case, it was working fairly well and then it just stopped 
working.  It would die mid-way through boot.  Again, disabling VBD 
grant-tables fixed the problem.  I'm going to look into the problem this 
evening and see if I can get you guys a more reproducable scenario.
> It doesn't seem to be destablizing, at least for us. Possibly there's
> been some feature interaction with later checkins. 
>  
Possibly.

> Anyone using the unstable tree should be reading the changelog
> closely...
>  
I agree.  I do, but I don't think a lot of people do.  I'm not trying to 
give you guys more work to do :-)  Just a quick note to xen-devel would 
suffice (if you've got an extra second).
Thanks Ian,

Regards,
Anthony Liguori

> Ian
>
>  
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