Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758450Ab2KVWbm (ORCPT ); Thu, 22 Nov 2012 17:31:42 -0500 Received: from mx1.redhat.com ([209.132.183.28]:30608 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758187Ab2KVWbi (ORCPT ); Thu, 22 Nov 2012 17:31:38 -0500 Message-ID: <50AEA7C8.6070102@redhat.com> Date: Thu, 22 Nov 2012 23:31:36 +0100 From: Zdenek Kabelac Organization: Red Hat User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121016 Thunderbird/16.0.1 MIME-Version: 1.0 To: LKML Subject: Unbalanced unlock with sysrq+SUB Content-Type: text/plain; charset=ISO-8859-2; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2957 Lines: 68 Hi For some time - when I reboot via 'sysrq + SUB' I get this BUG: message My system is running rawhide (systemd) on ext4 filesystem. systemd-195-7.fc18.x86_64 Zdenek SysRq : Emergency Remount R/O ===================================== [ BUG: bad unlock balance detected! ] 3.7.0-rc6-00028-g88e75b6 #101 Not tainted ------------------------------------- kworker/1:2/79 is trying to release lock (sb_writers) at: [] mnt_drop_write+0x24/0x30 but there are no more locks to release! other info that might help us debug this: 4 locks held by kworker/1:2/79: #0: (events){.+.+.+}, at: [] process_one_work+0x149/0x750 #1: ((work)#3){+.+...}, at: [] process_one_work+0x149/0x750 #2: (&type->s_umount_key#19){+++++.}, at: [] do_emergency_remount+0x80/0x120 #3: (files_lglock){.+.+..}, at: [] mark_files_ro+0x2b/0x100 stack backtrace: Pid: 79, comm: kworker/1:2 Not tainted 3.7.0-rc6-00028-g88e75b6 #101 Call Trace: [] ? mnt_drop_write+0x24/0x30 [] print_unlock_inbalance_bug+0xfe/0x110 [] lock_release_non_nested+0x21e/0x320 [] ? pagevec_lookup_tag+0x25/0x40 [] ? mnt_drop_write+0x24/0x30 [] lock_release+0x97/0x300 [] __sb_end_write+0x81/0x90 [] mnt_drop_write+0x24/0x30 [] mnt_drop_write_file+0x12/0x20 [] mark_files_ro+0xf7/0x100 [] do_remount_sb+0x13d/0x1b0 [] ? do_emergency_remount+0x80/0x120 [] do_emergency_remount+0x11c/0x120 [] process_one_work+0x1ad/0x750 [] ? process_one_work+0x149/0x750 [] ? worker_thread+0x21b/0x450 [] ? _raw_spin_lock_irq+0x19/0x80 [] ? mount_single+0xe0/0xe0 [] worker_thread+0x15d/0x450 [] ? rescuer_thread+0x230/0x230 [] kthread+0xdb/0xe0 [] ? kthread_create_on_node+0x140/0x140 [] ret_from_fork+0x7c/0xb0 [] ? kthread_create_on_node+0x140/0x140 EXT4-fs (sda2): re-mounted. Opts: (null) EXT4-fs (sda5): re-mounted. Opts: (null) Emergency Remount complete systemd[1]: Stopping Sendmail Mail Transport Client... systemd[1]: Stopping Sendmail Mail Transport Agent... systemd[1]: Starting Sendmail Mail Transport Agent... systemd[1]: Started Sendmail Mail Transport Agent. systemd[1]: Starting Sendmail Mail Transport Client... systemd[1]: Started Sendmail Mail Transport Client. SysRq : Resetting -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/