Re: [Xen-devel] [PATCH v2 1/2] x86/mm: fix a potential race condition in map_pages_to_xen().

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.11.17 at 11:34, <yu.c.zhang@xxxxxxxxxxxxxxx> wrote:
> Our debug showed the concerned page->count_info was already(and 
> unexpectedly)
> cleared in free_xenheap_pages(), and the call trace should be like this:
> 
> free_xenheap_pages()
>      ^
>      |
> free_xen_pagetable()
>      ^
>      |
> map_pages_to_xen()
>      ^
>      |
> update_xen_mappings()
>      ^
>      |
> get_page_from_l1e()
>      ^
>      |
> mod_l1_entry()
>      ^
>      |
> do_mmu_update()

This ...

> Is above description convincing enough? :-)

... is indeed enough for me to suggest to Julien that we take both
patches (once they're ready). But it's his decision in the end.

Jan


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