On 2015-09-15 14:42, Tyler Williams wrote:
Maybe, I'm not entirely certain if disabling qgroups on a volume removes the qgroup metadata, and if the metadata is still there, it might still cause issues. It's worth trying though because it shouldn't make anything worse than it already is.So I only had qgroups enabled because at some point it seemed like it gave me the size of individual snapshots. Would it be likely that if I just removed qgroups from that volume that would prevent that message in the future?
On Tue, Sep 15, 2015 at 12:32 PM, Austin S Hemmelgarn <ahferroin7@xxxxxxxxx> wrote:On 2015-09-15 14:13, Tyler Williams wrote:I've received several kernel warnings over the last few weeks. I checked on the #BTRFS irc channel and it was suggested that I post the relevant information here to see if this was something that I should be worried about. [root@tawilliams ~]# uname -a Linux tawilliams.williamstlr.net 4.1.6-201.fc22.x86_64 #1 SMP Fri Sep 4 17:49:24 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux [root@tawilliams ~]# btrfs --version btrfs-progs v4.1 [root@tawilliams ~]# btrfs fi sh Label: 'fedora' uuid: 1e37c117-d493-4d3e-a585-46b90de16569 Total devices 1 FS bytes used 3.70GiB devid 1 size 47.31GiB used 6.04GiB path /dev/sda4 Label: none uuid: f9b38a56-44d4-4974-9640-95341bd8ae6a Total devices 1 FS bytes used 424.23GiB devid 1 size 931.51GiB used 428.04GiB path /dev/sdc1 Label: none uuid: 5266d71b-1d75-4b28-accc-95187f2d65a4 Total devices 1 FS bytes used 889.09GiB devid 1 size 931.50GiB used 892.03GiB path /dev/sdb2 Label: 'tawilliams' uuid: 142b1866-f5e1-48b0-acd3-401e8eb4d219 Total devices 2 FS bytes used 1.10TiB devid 1 size 1.82TiB used 1.16TiB path /dev/sdb1 devid 2 size 1.82TiB used 1.16TiB path /dev/sde Label: 'fedora-server' uuid: a5a82150-7ff3-43d4-a86b-a7f9d2df3737 Total devices 1 FS bytes used 27.09GiB devid 1 size 47.51GiB used 38.81GiB path /dev/sdd3 btrfs-progs v4.1 [root@tawilliams ~]# btrfs fi df /media/btrfs-raid1/ Data, RAID1: total=1.16TiB, used=1.10TiB System, RAID1: total=32.00MiB, used=208.00KiB Metadata, RAID1: total=5.00GiB, used=3.86GiB GlobalReserve, single: total=512.00MiB, used=0.00B Sep 15 10:45:16 tawilliams.williamstlr.net kernel: ------------[ cut here ]------------ Sep 15 10:45:16 tawilliams.williamstlr.net kernel: WARNING: CPU: 0 PID: 544 at fs/btrfs/qgroup.c:1028 __qgroup_excl_accounting+0x1cf/0x260 [btrfs]() Sep 15 10:45:16 tawilliams.williamstlr.net kernel: Modules linked in: nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ebtable_nat ebtable_broute bridg Sep 15 10:45:16 tawilliams.williamstlr.net kernel: CPU: 0 PID: 544 Comm: btrfs-cleaner Not tainted 4.1.6-201.fc22.x86_64 #1 Sep 15 10:45:16 tawilliams.williamstlr.net kernel: Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v1.0 11/26/2012 Sep 15 10:45:16 tawilliams.williamstlr.net kernel: 0000000000000000 000000005a7148da ffff8800383f7b38 ffffffff81799a6d Sep 15 10:45:16 tawilliams.williamstlr.net kernel: 0000000000000000 0000000000000000 ffff8800383f7b78 ffffffff810a165a Sep 15 10:45:16 tawilliams.williamstlr.net kernel: 0000000000000000 ffff880036e71048 ffff880022079960 ffffffffffffc000 Sep 15 10:45:16 tawilliams.williamstlr.net kernel: Call Trace: Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffff81799a6d>] dump_stack+0x45/0x57 Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffff810a165a>] warn_slowpath_common+0x8a/0xc0 Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffff810a178a>] warn_slowpath_null+0x1a/0x20 Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffffa01341af>] __qgroup_excl_accounting+0x1cf/0x260 [btrfs] Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffffa01372ec>] btrfs_delayed_qgroup_accounting+0x2dc/0xc70 [btrfs] Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffffa00b6a67>] ? walk_up_proc+0xd7/0x500 [btrfs] Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffffa00ba85f>] btrfs_run_delayed_refs.part.68+0x20f/0x280 [btrfs] Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffffa00ba8e5>] btrfs_run_delayed_refs+0x15/0x30 [btrfs] Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffffa00cb68a>] btrfs_should_end_transaction+0x5a/0x60 [btrfs] Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffffa00b8c85>] btrfs_drop_snapshot+0x455/0x8a0 [btrfs] Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffffa01276cc>] ? btrfs_kill_all_delayed_nodes+0x5c/0x110 [btrfs] Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffffa00df11f>] ? btrfs_run_defrag_inodes+0x29f/0x360 [btrfs] Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffffa00cbb82>] btrfs_clean_one_deleted_snapshot+0xb2/0x110 [btrfs] Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffffa00c3dc5>] cleaner_kthread+0xb5/0x1b0 [btrfs] Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffffa00c3d10>] ? check_leaf+0x380/0x380 [btrfs] Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffff810c0bf8>] kthread+0xd8/0xf0 Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffff810c0b20>] ? kthread_worker_fn+0x180/0x180 Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffff817a0422>] ret_from_fork+0x42/0x70 Sep 15 10:45:16 tawilliams.williamstlr.net kernel: [<ffffffff810c0b20>] ? kthread_worker_fn+0x180/0x180 Sep 15 10:45:16 tawilliams.williamstlr.net kernel: ---[ end trace e8c2f252933902d6 ]---While I can't provide any advice as to whether this is something to be worried about or not, I would like to point out that even in recent kernel versions, there are multiple known issues in the qgroup code. I don't think there's anything currently known on 4.1.6 that has the possibility of eating your data, but I am by no means an expert on this particular subject (I don't use quotas on most of my systems, and for those that I do, I just use separate thinly-provisioned partitions for the individual quota users (which in turn makes things much easier for everyone involved)).
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