From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Tue, 19 Jun 2018 10:40:37 -0600 From: Ross Zwisler 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 Subject: Re: [PATCH v14 00/74] Convert page cache to XArray Message-ID: <20180619164037.GA6679@linux.intel.com> References: <20180617020052.4759-1-willy@infradead.org> <20180619031257.GA12527@linux.intel.com> <20180619092230.GA1438@bombadil.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180619092230.GA1438@bombadil.infradead.org> Sender: owner-linux-mm@kvack.org List-ID: On Tue, Jun 19, 2018 at 02:22:30AM -0700, Matthew Wilcox wrote: > On Mon, Jun 18, 2018 at 09:12:57PM -0600, Ross Zwisler wrote: > > Hit another deadlock. This one reproduces 100% of the time in my setup with > > XFS + DAX + generic/340. It doesn't reproduce for me at all with > > next-20180615. Here's the output from "echo w > /proc/sysrq-trigger": > > *sigh*. I wonder what the differences are between our setups ... > > > [ 92.849119] sysrq: SysRq : Show Blocked State > > [ 92.850506] task PC stack pid father > > [ 92.852299] holetest D 0 1651 1466 0x00000000 > > [ 92.853912] Call Trace: > > [ 92.854610] __schedule+0x2c5/0xad0 > > [ 92.855612] schedule+0x36/0x90 > > [ 92.856602] get_unlocked_entry+0xce/0x120 > > [ 92.857756] ? dax_insert_entry+0x2b0/0x2b0 > > [ 92.858931] grab_mapping_entry+0x19e/0x250 > > [ 92.860119] dax_iomap_pte_fault+0x115/0x1140 > > [ 92.860836] dax_iomap_fault+0x37/0x40 > ... > > This looks very similar to the one I reported last week with generic/269. > > Yeah, another missing wakeup, no doubt. Can you bisect this? That was > how I found the last one; bisected it to a single patch and stared very > hard at the patch until I saw it. I'm not going to be in a position to > tinker with my DAX setup until the first week of July. It bisected to this commit: b4b4daa7e8fb0ad0fee35d3e28d00e97c849a6cb is the first bad commit commit b4b4daa7e8fb0ad0fee35d3e28d00e97c849a6cb Author: Matthew Wilcox Date: Thu Mar 29 22:58:27 2018 -0400 dax: Convert page fault handlers to XArray This is the last part of DAX to be converted to the XArray so remove all the old helper functions. Signed-off-by: Matthew Wilcox