Re: [x86/mm/gup] 2947ba054a [ 71.329069] kernel BUG at include/linux/pagemap.h:151!

[Kirill A. Shutemov]

On Fri, Mar 24, 2017 at 11:51:53AM +0100, Peter Zijlstra wrote:
> On Fri, Mar 24, 2017 at 01:24:36PM +0300, Kirill A. Shutemov wrote:
> 
> > I'm not sure what is the best way to fix this.
> > Few options:
> >  - Drop the VM_BUG();
> >  - Bump preempt count during __get_user_pages_fast();
> >  - Use get_page() instead of page_cache_get_speculative() on x86.
> > 
> > Any opinions?
> 
> I think I'm in favour of the first; either remove or amend to include
> irqs_disabled() or so.
> 
> This in favour of keeping the variants of GUP down.

Something like this?

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