Re: [PATCH v2 2/2] selftests/mm: verify droppable mappings cannot be locked

[Andrew Morton]

On Tue, 31 Mar 2026 14:17:50 +0100 Mark Brown <broonie@xxxxxxxxxx> wrote:

> On Tue, Mar 10, 2026 at 08:58:21AM -0700, Anthony Yznaga wrote:
> 
> > Verify that a mapping created with MAP_DROPPABLE cannot be locked
> > via mlock(), and that it will not be locked if it's created after
> > mlockall(MCL_FUTURE).
> 
> I'm seeing a regression in -next on 32 bit arm which bisects to this
> patch:

Cool, thanks.

> ...
>
> All these failures which cause the entire test program to immediately
> die seem exceessively strong...

Well, is the test code incorrect, or is the patch which it's testing
incorrect?  That's 5435ba164b0d ("mm: prevent droppable mappings from
being locked")?

5435ba164b0d is presently in mm-stable, cc:stable@xxxxxxxxxxxxxxx.