[LTP] mbind() fails to fail with EIO

Oscar Salvador osalvador@suse.de
Tue Mar 19 16:10:50 CET 2019

On Tue, Mar 19, 2019 at 05:52:33PM +0300, Kirill A. Shutemov wrote:
> On Tue, Mar 19, 2019 at 03:41:33PM +0100, Oscar Salvador wrote:
> > On Tue, Mar 19, 2019 at 05:26:39PM +0300, Kirill A. Shutemov wrote:
> > > That's all sounds reasonable.
> > > 
> > > We only need to make sure the bug fixed by 77bf45e78050 will not be
> > > re-introduced.
> > 
> > I gave it a spin with the below patch.
> > Your testcase works (so the bug is not re-introduced), and we get -EIO
> > when running the ltp test [1].
> > So unless I am missing something, it should be enough.
> Don't we need to bypass !vma_migratable(vma) check in
> queue_pages_test_walk() for MPOL_MF_STRICT? I mean user still might want
> to check if all pages are on the right not even the vma is not migratable.

Yeah, I missed that.
Then, I guess that we have to put the check into queue_pages_pte_range as well,
and place it right before migrate_page_add().
So, if it is not placed in the node and is not migreatable, we return -EIO.

Oscar Salvador

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