Re: [Xen-devel] BUG: xend oopses on munmap of /proc/xen/privcmd

[Rik van Riel <riel@xxxxxxxxxx>]

On Tue, 26 Apr 2005, Keir Fraser wrote:

> Various people have been seeing this, although I haven't reproduced it 
> on my own test box. The problem is not the munmap itself (although it 
> obviously needs robustifying) but that something (presumably the ioctl) 
> has mmaped bogus pages. The ioctl is only supposed to mmap the new 
> domain's pages -- these will have pfn_valid() as false and so will not 
> take the set_page_dirty() path in zap_pte_range.

How do these two go together with ballooning ?

#define pfn_to_page(pfn)        (mem_map + (pfn))
#define pfn_valid(pfn)          ((pfn) < max_mapnr)

I'll comb through the changeset you mentioned.  Maybe I'll
find something ;)

-- 
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan

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