UBIFS assert failed in ubifs_set_page_dirty at 1421

[Kirill A. Shutemov]

On Mon, Nov 24, 2014 at 10:20:59AM +0000, Jijiagang wrote:
> Hi Kirill,
> I test your patch, bus there's no dump_vma definition.
> The log is here, hope it will be helpful.
> 
>  page:817fd7e0 count:3 mapcount:1 mapping:a318bb8c index:0x4
>  page flags: 0xa19(locked|uptodate|dirty|arch_1|private)
>  pte_write: 1
>  page:81441a80 count:3 mapcount:1 mapping:a318bb8c index:0x5
>  page flags: 0x209(locked|uptodate|arch_1)
>  pte_write: 1

Okay, pte is writable but page is not dirty and doesn't have private flag
set.

I looked through code and don't see how that could happen.

>  UBIFS assert failed in ubifs_set_page_dirty at 1422 (pid 545)
>  CPU: 2 PID: 545 Comm: kswapd0 Tainted: P           O 3.10.0_s40 #19

Is it possible to reproduce the issue on current upstream without any
patches or third-party modules?

-- 
 Kirill A. Shutemov