Re: [Xen-devel] xen dom0 2.6.32.15 kernel BUG at drivers/xen/gra

On Mon, 14 Jun 2010, Arnd Hannemann wrote:
> Hi,
> 
> we have regular but hard to reproduce (wait for a day or two starting domUs) 
> kernel panics (see below) with latest
> "xen/stable-2.6.32.x" git tree.
> 
> Any idea, anyone?
> 

this CS from origin/xen/dom0/gntdev should fix your problem:

sstabellini@kaball-desktop:~/xensource/linux-pvops-latest$ git show 
ad469f0da31bc16b945f9a06710b9d45434d0091
commit ad469f0da31bc16b945f9a06710b9d45434d0091
Author: Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
Date:   Wed Jun 9 12:34:02 2010 -0700

    xen/gntdev: use spinlocks rather than rwsem for locking
    
    The mmu notifier mechanism calls its callbacks with an rcu lock,
    which disables preemption.  This means we cannot use any blocking
    synchronization for locking.
    
    Convert all the rwsemas to plain spinlocks.  This requires that
    the memory allocation and copying to/from userspace be split
    from the actual datastructure updates since they can't be done
    under spinlock.
    
    Signed-off-by: Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
    Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>


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