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SubjectRe: [PATCH v14 00/74] Convert page cache to XArray
On Wed, Jul 25, 2018 at 02:03:23PM -0700, Matthew Wilcox wrote:
> On Wed, Jun 27, 2018 at 01:44:38PM -0600, Ross Zwisler wrote:
> > On Wed, Jun 27, 2018 at 04:05:29AM -0700, Matthew Wilcox wrote:
> > > On Tue, Jun 19, 2018 at 10:16:38AM -0700, Matthew Wilcox wrote:
> > > > I think I see a bug. No idea if it's the one you're hitting ;-)
> > > >
> > > > I had been intending to not use the 'entry' to decide whether we were
> > > > waiting on a 2MB or 4kB page, but rather the xas. I shelved that idea,
> > > > but not before dropping the DAX_PMD flag being passed from the PMD
> > > > pagefault caller. So if I put that back ...
> > >
> > > Did you get a chance to test this?
> >
> > With this patch it doesn't deadlock, but the test dies with a SIGBUS and we
> > hit a WARN_ON in the DAX code:
> >
> > WARNING: CPU: 5 PID: 1678 at fs/dax.c:226 get_unlocked_entry+0xf7/0x120
> >
> > I don't have a lot of time this week to debug further. The quickest path to
> > victory is probably for you to get this reproducing in your test setup. Does
> > XFS + DAX + generic/340 pass for you?
>
> I now have generic/340 passing. I've pushed a new version to
> git://git.infradead.org/users/willy/linux-dax.git xarray

Thanks, I'll throw it in my test setup.

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