From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.6 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8E024C433EF for ; Tue, 19 Jun 2018 09:22:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 45BD220874 for ; Tue, 19 Jun 2018 09:22:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="YBWBSKMc" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 45BD220874 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756660AbeFSJWg (ORCPT ); Tue, 19 Jun 2018 05:22:36 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:44692 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756350AbeFSJWd (ORCPT ); Tue, 19 Jun 2018 05:22:33 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:To:From:Date:Sender:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=ShJfiVZV7hyiFmuMagPDrULQ5+swCRupHD4iZxALYL8=; b=YBWBSKMcIS23QG+X6uVJY570J ho7OG+pk4NQ2l47l9s+MsTCov/VRE2KIfqtEytBtq5YB/d/NpJ/ukifAEGmns7CUErfa6Z3XIWs+m 7V0bCx8/pKLyJS3yOGW0BcHE5zg0CnibwL4Bzz5PMF+WUC5rUepO2qHd1y23FpgxqBaClZQzwaEVx 4iU5EpNWlXdAsh9iWm7XLahSNkdUdN9PfmQNZOexWhyG6yIM+Qb0ux9hwQUbLqhn6h5HPoEfzR7S+ KWWs3Pw0AXEQuXI5F3zwlcIb+F9dJIey9pdSbCjAowIkAdmcl1W43pNFNIeh+46J7tipo6zq660z+ j7Z2TdFAg==; Received: from willy by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1fVCqN-0000eP-8D; Tue, 19 Jun 2018 09:22:31 +0000 Date: Tue, 19 Jun 2018 02:22:30 -0700 From: Matthew Wilcox 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 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> User-Agent: Mutt/1.9.2 (2017-12-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.