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Date: Mon, 30 Jul 2018 08:43:10 -0700
From: Matthew Wilcox <willy@infradead.org>
To: Ross Zwisler <ross.zwisler@linux.intel.com>, zwisler@kernel.org,
	linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, Jan Kara <jack@suse.cz>,
	Jeff Layton <jlayton@redhat.com>,
	Lukas Czerner <lczerner@redhat.com>, Christoph Hellwig <hch@lst.de>,
	Goldwyn Rodrigues <rgoldwyn@suse.com>,
	Nicholas Piggin <npiggin@gmail.com>,
	Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>,
	linux-nilfs@vger.kernel.org, Jaegeuk Kim <jaegeuk@kernel.org>,
	Chao Yu <yuchao0@huawei.com>,
	linux-f2fs-devel@lists.sourceforge.net
Subject: Re: [PATCH v14 00/74] Convert page cache to XArray
Message-ID: <20180730154310.GA4685@bombadil.infradead.org>
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On Fri, Jul 27, 2018 at 11:20:35AM -0600, Ross Zwisler wrote:
> Okay, the next failure I'm hitting is with DAX + XFS + generic/344.  It
> doesn't happen every time, but I can usually recreate it within 10 iterations
> of the test.  Here's the failure:

Thanks.  I've made some progress with this; the WARNing is coming from
a vm_insert_* mkwrite call.  Inserting sufficient debugging code has
let me determine we still have a zero_pfn in the page table when we're
trying to insert a new PFN.