linux-ext4 - Re: [RFC v3] [PATCH 0/18] DAX page fault locking

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Date:	Wed, 11 May 2016 09:52:22 -0600
From:	Ross Zwisler <ross.zwisler@...ux.intel.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-mm@...ck.org, Dan Williams <dan.j.williams@...el.com>,
	linux-nvdimm@...ts.01.org, Matthew Wilcox <willy@...ux.intel.com>
Subject: Re: [RFC v3] [PATCH 0/18] DAX page fault locking

On Wed, May 11, 2016 at 11:19:30AM +0200, Jan Kara wrote:
> On Tue 10-05-16 16:39:37, Ross Zwisler wrote:
> > On Tue, May 10, 2016 at 02:30:03PM -0600, Ross Zwisler wrote:
> > > On Tue, May 10, 2016 at 05:28:14PM +0200, Jan Kara wrote:
> > > > On Mon 09-05-16 11:38:28, Jan Kara wrote:
> > > > Somehow, I'm not able to reproduce the warnings... Anyway, I think I see
> > > > what's going on. Can you check whether the warning goes away when you
> > > > change the condition at the end of page_cache_tree_delete() to:
> > > > 
> > > >         if (!dax_mapping(mapping) && !workingset_node_pages(node) &&
> > > >             list_empty(&node->private_list)) {
> > > 
> > > Yep, this took care of both of the issues that I reported.  I'll restart my
> > > testing with this in my baseline, but as of this fix I don't have any more
> > > open testing issues. :)
> > 
> > Well, looks like I spoke too soon.  The two tests that were failing for me are
> > now passing, but I can still create what looks like a related failure using
> > XFS, DAX, and the two xfstests generic/231 and generic/232 run back-to-back.
> 
> Hum, full xfstests run completes for me just fine. Can you reproduce the
> issue with the attached debug patch? Thanks!

Here's the resulting debug:

[  212.541923] Wrong node->count 244.
[  212.542316] Host sb pmem0p2 ino 2097257
[  212.542696] Node dump: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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