Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752428AbcJDRqu (ORCPT ); Tue, 4 Oct 2016 13:46:50 -0400 Received: from arcturus.aphlor.org ([188.246.204.175]:41624 "EHLO arcturus.aphlor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751423AbcJDRqt (ORCPT ); Tue, 4 Oct 2016 13:46:49 -0400 Date: Tue, 4 Oct 2016 13:46:45 -0400 From: Dave Jones To: Johannes Weiner Cc: Linux Kernel , linux-mm@kvack.org Subject: Re: page_cache_tree_insert WARN_ON hit on 4.8+ Message-ID: <20161004174645.urwwmvgibabaokjn@codemonkey.org.uk> Mail-Followup-To: Dave Jones , Johannes Weiner , Linux Kernel , linux-mm@kvack.org References: <20161004170955.n25polpcsotmwcdq@codemonkey.org.uk> <20161004173425.GA1223@cmpxchg.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161004173425.GA1223@cmpxchg.org> User-Agent: NeoMutt/20160916 (1.7.0) X-Spam-Flag: skipped (authorised relay user) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 793 Lines: 27 On Tue, Oct 04, 2016 at 07:34:25PM +0200, Johannes Weiner wrote: > Hi Dave, > > On Tue, Oct 04, 2016 at 01:09:55PM -0400, Dave Jones wrote: > > Hit this during a trinity run. > > Kernel built from v4.8-1558-g21f54ddae449 > > > > WARNING: CPU: 0 PID: 5670 at ./include/linux/swap.h:276 page_cache_tree_insert+0x198/0x1b0 > > Thanks for the report. > > I've been trying to reproduce this too after Linus got hit by it. Is > there any way to trace back the steps what trinity was doing exactly? That run didn't have logging enabled, so not sure.. > What kind of file(system) this was operating on, btrfs > file size, what the /proc/vmstat delta before the operation until the trigger looks like? No idea. Let me play with some options, see if I can narrow it down. Dave