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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT 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 23DB2C43387 for ; Fri, 28 Dec 2018 13:40:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EFCC020879 for ; Fri, 28 Dec 2018 13:40:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730624AbeL1NkI (ORCPT ); Fri, 28 Dec 2018 08:40:08 -0500 Received: from aristoteles.cuci.nl ([212.125.128.18]:60487 "EHLO aristoteles.cuci.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730444AbeL1NkI (ORCPT ); Fri, 28 Dec 2018 08:40:08 -0500 Received: by aristoteles.cuci.nl (Postfix, from userid 500) id C95ED5463; Fri, 28 Dec 2018 14:40:06 +0100 (CET) Date: Fri, 28 Dec 2018 14:40:06 +0100 From: "Stephen R. van den Berg" To: Qu Wenruo Cc: Btrfs BTRFS Subject: Re: Kernel traces Message-ID: <20181228134006.GA13717@cuci.nl> References: <20181210120514.GA14828@cuci.nl> <20181211115226.GA20157@cuci.nl> <20181212072614.GA9188@cuci.nl> <20181228092036.GA30363@cuci.nl> <9b81647b-66c2-9870-161f-084b7d41af9c@gmx.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9b81647b-66c2-9870-161f-084b7d41af9c@gmx.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Qu Wenruo wrote: >> Ok. Finally have a sysrq+w output of 4.19.8. >> The uptime of this system has been a few days. It has already received quite >> some btrfs-sends in that time (every night). When the sysrq+w output was >> taken, the system started to get more and more processes in a D kernel state >> bordering on becoming unusable. I had to hard-reset the system after this >> to get it going again. >It's caused by qgroup, and a dead lock on btrfs_drop_snapshot(). >This is one of the easiest way to trigger an ABBA deadlock. >Please either disable qgroup or apply this patch to solve it: >https://patchwork.kernel.org/patch/10725371/ Any idea in which kernel version this patch is/will be included? -- Stephen.