Re: [Xen-devel] Kernel aio bug in Debian 2.6.32-5-xen kernel?

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2012-04-26 at 15:10 +0100, Stefano Stabellini wrote:
> On Thu, 26 Apr 2012, Ian Campbell wrote:
> > On Thu, 2012-04-26 at 14:55 +0100, George Dunlap wrote:
> > > On Thu, Apr 26, 2012 at 2:46 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
> > > wrote:
> > > >> It would still be good to get the AIO stuff fixed in some way, as I'm
> > > >> sure I'm not the only one who's going to run into this problem.
> > > >
> > > > Stefano has fixed it in the upstream kernel. I'm afraid there is no
> > > > realistic chance of it being fixed in the squeeze kernel at this stage.
> > > 
> > > Any chance we could get AIO disabled in the squeeze kernel then?
> > 
> > I don't think so, that would break legitimate uses of AIO.
> > 
> > We could potentially ensure that Xen/qemu doesn't try to use AIO on
> > older kernels but AIUI you were running a newer version than provided in
> > Squeeze so that isn't something we can fix in Debian?
> 
> We could add a patch in Debian to disable AIO and O_DIRECT in QEMU.

AUIU Qemu in this case is not the qemu in Debian, it's the one from
xen-unstable.

> Otherwise I don't really know what we could do upstream to detect
> whether a kernel has a buggy O_DIRECT/AIO implementation or not.

Me neither.

Ian.



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