From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ross Zwisler Subject: Re: [PATCH v14 00/74] Convert page cache to XArray Date: Wed, 27 Jun 2018 13:44:38 -0600 Message-ID: <20180627194438.GA20774@linux.intel.com> References: <20180617020052.4759-1-willy@infradead.org> <20180619031257.GA12527@linux.intel.com> <20180619092230.GA1438@bombadil.infradead.org> <20180619164037.GA6679@linux.intel.com> <20180619171638.GE1438@bombadil.infradead.org> <20180627110529.GA19606@bombadil.infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20180627110529.GA19606@bombadil.infradead.org> Sender: linux-kernel-owner@vger.kernel.org To: Matthew Wilcox Cc: Ross Zwisler , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Jan Kara , Jeff Layton , Lukas Czerner , Christoph Hellwig , Goldwyn Rodrigues , Nicholas Piggin , Ryusuke Konishi , linux-nilfs@vger.kernel.org, Jaegeuk Kim , Chao Yu , linux-f2fs-devel@lists.sourceforge.net List-Id: linux-f2fs-devel.lists.sourceforge.net 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?