Re: [Xen-devel] Question regarding SLAB corruption

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 9/7/07 16:39, "Lukas Hejtmanek" <xhejtman@xxxxxxxxxxx> 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.

 -- Keir


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