From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx3.munzinger.de ([195.226.116.139]:7852 "EHLO mx3.munzinger.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752641AbbF2JlW (ORCPT ); Mon, 29 Jun 2015 05:41:22 -0400 Received: from imap2.munzinger.de (imap2.munzinger.de [192.168.0.106]) by mx3.munzinger.de (Postfix) with ESMTP id 2121047AC0 for ; Mon, 29 Jun 2015 11:35:13 +0200 (CEST) Received: from o3-3.localnet (o3-3.munzinger.de [192.168.100.225]) by imap2.munzinger.de (Postfix) with ESMTPSA id 1A42263665 for ; Mon, 29 Jun 2015 11:35:13 +0200 (CEST) From: David Weber To: linux-btrfs@vger.kernel.org Subject: WARNING: at /fs/btrfs/extent-tree.c:4029 btrfs_free_reserved_data_space Date: Mon, 29 Jun 2015 11:35:12 +0200 Message-ID: <6617728.KSCQs1dauk@o3-3> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi, we are testing Btrfs as a kvm storage system with "defaults,space_cache,nodatacow" mount options and regular snapshots. While testing we sometimes get these warnings: WARNING: CPU: 5 PID: 11335 at /home/kernel/COD/linux/fs/btrfs/extent- tree.c:4029 btrfs_free_reserved_data_space+0x102/0x110 [btrfs]() Full log: https://gist.github.com/anonymous/5f672f72899a3d52c20c Once they start, they flood dmesg with several messages per second. After a reboot, it takes a while until they start to appear again. We have seen them with Linux 4.0.6 and 4.1 This was already reported a few times: https://bugzilla.opensuse.org/show_bug.cgi?id=904023 https://bugzilla.redhat.com/show_bug.cgi?id=1173937 http://www.spinics.net/lists/linux-btrfs/msg39069.html https://lkml.org/lkml/2014/10/22/899 Always with no solution Is this a real problem or can we safely ignore this? Cheers, David