Re: [Xen-devel] Question regarding SLAB corruption

[Lukas Hejtmanek <xhejtman@xxxxxxxxxxx>]

On Mon, Jul 09, 2007 at 05:13:10PM +0100, Keir Fraser wrote:
> >> You definitely need the patch that I posted. If it won't apply cleanly to
> >> your kernel tree then you'll have to manually apply it, or move to the
> >> current 'unstable' linux-2.6.18-xen.hg tree.
> > 
> > Yeah, it solved the oops, thanks! However, I got another oops in 
> > __sync_single
> > because host addr is invalid.
> > 
> > I suppose, it is because in sync_single it picks up invalid line from the
> > io_tlb_orig_addr. It uses index 3332 which is not inserted by map_page.
> > The invalid address is 0x0021d1242de00000 but it is strange because I added
> > memset to zero io_tlb_orig_addr at the beginning, however, such address is
> > still there even if the index were not inserted by the map_page.
> 
> Nothing should read from an io_tlb_orig_addr[] slot that hasn't been
> initialised by map_single(). That's because sync_single() is only valid to
> be called on a memory region that was previously map_single()d. So what
> you're seeing is rather odd.

Well, it looks like that __sync_single is called on the first page that has
been allocated in the order 6 batch. So, are you saying that this is something
incorrect?

Because >0 orders do not pass through map_single(), if I understand correctly.

-- 
Lukáš Hejtmánek

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