From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756172AbbEUPr6 (ORCPT ); Thu, 21 May 2015 11:47:58 -0400 Received: from arcturus.aphlor.org ([188.246.204.175]:47244 "EHLO arcturus.aphlor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755824AbbEUPr5 (ORCPT ); Thu, 21 May 2015 11:47:57 -0400 Date: Thu, 21 May 2015 11:47:49 -0400 From: Dave Jones To: NeilBrown Cc: Linux Kernel Subject: incomplete RAID0 array causing bdi_unregister WARN_ON. Message-ID: <20150521154749.GA20102@codemonkey.org.uk> Mail-Followup-To: Dave Jones , NeilBrown , Linux Kernel MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.23 (2014-03-12) X-Spam-Score: -2.9 (--) X-Spam-Report: Spam report generated by SpamAssassin on "arcturus.aphlor.org" Content analysis details: (-2.9 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] X-Authenticated-User: davej@codemonkey.org.uk Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org One of the disks in my 4 disk RAID0 stripe died. It's a hardware problem, but this spew seems unnecessary.. Dave WARNING: CPU: 0 PID: 39 at mm/backing-dev.c:372 bdi_unregister+0x3a/0x50() CPU: 0 PID: 39 Comm: kworker/0:1 Not tainted 4.1.0-rc4-gelk-debug+ #1 Workqueue: md_misc mddev_delayed_delete [md_mod] 0000000000000009 ffff8800baf9fbf8 ffffffffa6768350 0000000000000000 0000000000000000 ffff8800baf9fc38 ffffffffa607eaaa ffff8800baf9fc18 ffff8800b57cdcd0 0000000000000000 0000000000000000 00000000ffffffff Call Trace: [] dump_stack+0x4f/0x7b [] warn_slowpath_common+0x8a/0xc0 [] warn_slowpath_null+0x1a/0x20 [] bdi_unregister+0x3a/0x50 [] del_gendisk+0x11f/0x250 [] md_free+0x43/0x60 [md_mod] [] kobject_release+0x7a/0x1c0 [] kobject_put+0x35/0x70 [] mddev_delayed_delete+0x34/0x40 [md_mod] [] process_one_work+0x1f1/0x820 [] ? process_one_work+0x160/0x820 [] ? worker_thread+0xfb/0x4b0 [] worker_thread+0x6b/0x4b0 [] ? process_one_work+0x820/0x820 [] ? process_one_work+0x820/0x820 [] kthread+0x11f/0x140 [] ? kthread_create_on_node+0x250/0x250 [] ret_from_fork+0x42/0x70 [] ? kthread_create_on_node+0x250/0x250 ---[ end trace 424fb17cf914b7dc ]--- 370 void bdi_unregister(struct backing_dev_info *bdi) 371 { 372 if (WARN_ON_ONCE(!bdi->dev)) 373 return; 374