From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from glockenspiel.complete.org ([78.47.53.23]:38058 "EHLO glockenspiel.complete.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750886Ab3KESxt (ORCPT ); Tue, 5 Nov 2013 13:53:49 -0500 Message-ID: <52793EB5.7050808@complete.org> Date: Tue, 05 Nov 2013 12:53:41 -0600 From: John Goerzen MIME-Version: 1.0 To: Tomasz Chmielewski CC: "linux-btrfs@vger.kernel.org" Subject: Re: umount waiting for 12 hours and still running References: <20131106034622.5209f127@virtall.com> In-Reply-To: <20131106034622.5209f127@virtall.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: On 11/05/2013 12:46 PM, Tomasz Chmielewski wrote: >> More than 12 hours ago, I tried to umount a btrfs filesystem. >> Something involving btrfs-cleaner and btrfs-transacti is still >> running, but I don't know what. > > Does "iostat -x 1" or "iostat -k 1" show any disk activity? Yes. For instance, from iostat -x 1: Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 dm-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdc 0.00 0.00 104.00 0.00 416.00 0.00 8.00 1.03 10.08 10.08 0.00 9.31 96.80 sdd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sdc and sdd are the drives in this brtfs FS, and they are used for nothing but that. iostat -k 1 shows similar levels of activity. > > Anything interesting in dmesg? There was this when it was first mounted: Nov 4 11:28:43 erwin kernel: [ 200.669110] btrfs: use lzo compression Nov 4 11:28:43 erwin kernel: [ 200.669114] btrfs: disk space caching is enabled Nov 4 11:28:58 erwin kernel: [ 215.660695] BTRFS debug (device dm-15): unlinked 1 orphans Nov 4 11:28:58 erwin kernel: [ 215.673535] btrfs: force skipping balance I later canceled the balance Also, several like this: Nov 4 11:51:23 erwin kernel: [ 1560.552129] INFO: task btrfs-transacti:6775 blocked for more than 120 seconds. Nov 4 11:51:23 erwin kernel: [ 1560.552200] btrfs-transacti D 90d3d4a2 0 6775 2 0x00000000 Nov 4 11:51:23 erwin kernel: [ 1560.553136] [] ? wait_current_trans.isra.20+0x8b/0xb5 [btrfs] Nov 4 11:51:23 erwin kernel: [ 1560.553217] [] ? start_transaction+0x1db/0x46f [btrfs] Nov 4 11:51:23 erwin kernel: [ 1560.553267] [] ? btrfs_attach_transaction+0xd/0x10 [btrfs] Nov 4 11:51:23 erwin kernel: [ 1560.553316] [] ? transaction_kthread+0xa3/0x158 [btrfs] Nov 4 11:51:23 erwin kernel: [ 1560.553366] [] ? try_to_freeze+0x28/0x28 [btrfs] but that was befrore the umount. Nothing else. -- John > >