From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f200.google.com (mail-pf0-f200.google.com [209.85.192.200]) by kanga.kvack.org (Postfix) with ESMTP id 4D2A76B0003 for ; Tue, 19 Jun 2018 05:22:34 -0400 (EDT) Received: by mail-pf0-f200.google.com with SMTP id j8-v6so4242835pfn.6 for ; Tue, 19 Jun 2018 02:22:34 -0700 (PDT) Received: from bombadil.infradead.org (bombadil.infradead.org. [2607:7c80:54:e::133]) by mx.google.com with ESMTPS id g1-v6si6316397pgs.377.2018.06.19.02.22.33 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 19 Jun 2018 02:22:33 -0700 (PDT) Date: Tue, 19 Jun 2018 02:22:30 -0700 From: Matthew Wilcox Subject: Re: [PATCH v14 00/74] Convert page cache to XArray Message-ID: <20180619092230.GA1438@bombadil.infradead.org> References: <20180617020052.4759-1-willy@infradead.org> <20180619031257.GA12527@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180619031257.GA12527@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: 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 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.