On Sat, Oct 27, 2012 at 5:28 AM, Liu Bo <bo.li.liu@xxxxxxxxxx> wrote:
> This comes from one of btrfs's project ideas,
> As we defragment files, we break any sharing from other snapshots.
> The balancing code will preserve the sharing, and defrag needs to grow this
> as well.
>
> Now we're able to fill the blank with this patch, in which we make full use of
> backref walking stuff.
>
> Here is the basic idea,
> o set the writeback ranges started by defragment with flag EXTENT_DEFRAG
> o at endio, after we finish updating fs tree, we use backref walking to find
> all parents of the ranges and re-link them with the new COWed file layout by
> adding corresponding backrefs.
>
> Originally patch by Li Zefan <lizf@xxxxxxxxxxxxxx>
> Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
> ---
> v3->v4:
> - fix duplicated refs bugs detected by mounting with autodefrag, thanks
> for the bug report from Mitch and Chris.
>
I'm picking up many WARN_ON messages while testing this patch.
I'm testing a snapshot script that uses kernel git sources along with
some git manipulations.
The kernel is a 3.6.4 kernel merged with the latest for-linus branch.
I mounted with -o compress-force=lzo,autodefrag.
I also have the second patch in this set (Btrfs: make snapshot-aware
defrag as a mount option). However, I did not mount with
'snap_aware_defrag'.
I did not find any corrupted data, and the partition passes a btrfsck
without error after these warnings were observed.
Here's a summary of the WARN_ON messages:
$ cat local/dmesg-3.6.4-x+ | grep "WARNING:"
[ 610.407561] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 610.407757] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 610.407929] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 661.211849] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 661.212004] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 661.212236] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 719.882942] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 719.883112] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 719.883232] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 786.978869] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 786.979003] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 786.979140] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 845.605176] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 845.605323] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 845.605445] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 912.300307] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 912.300454] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 912.300577] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 968.835873] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 968.836032] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 968.836156] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 1023.778160] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 1023.778316] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 1023.778435] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 1064.342768] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 1064.342914] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 1064.343112] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 1177.892047] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 1177.892189] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 1177.892312] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 1281.951715] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 1281.951857] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 1281.951978] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 1282.804376] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 1282.804524] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 1282.804645] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 1351.187114] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 1351.187263] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 1351.187391] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 1399.022919] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 1399.023086] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 1399.023206] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 1483.724756] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 1483.724895] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 1483.725031] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 1523.081643] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 1523.081792] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 1523.081922] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 1555.993160] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 1555.993299] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 1555.993420] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 1556.252181] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 1556.252312] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 1556.252427] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 1557.218561] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 1557.218691] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 1557.218805] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 1557.895069] WARNING: at fs/btrfs/extent-tree.c:4417
btrfs_free_block_groups+0x2ad/0x34c [btrfs]()
[ 1557.895261] WARNING: at fs/btrfs/extent-tree.c:4418
btrfs_free_block_groups+0x347/0x34c [btrfs]()
[ 1557.895435] WARNING: at fs/btrfs/extent-tree.c:7687
btrfs_free_block_groups+0x23e/0x34c [btrfs]()
[ 1557.895619] WARNING: at fs/btrfs/extent-tree.c:7687
btrfs_free_block_groups+0x23e/0x34c [btrfs]()
Here's a snip of the code that has the WARN_ONs in inode.c:
void btrfs_destroy_inode(struct inode *inode)
{
struct btrfs_ordered_extent *ordered;
struct btrfs_root *root = BTRFS_I(inode)->root;
WARN_ON(!hlist_empty(&inode->i_dentry));
WARN_ON(inode->i_data.nrpages);
WARN_ON(BTRFS_I(inode)->outstanding_extents); // line 7779
WARN_ON(BTRFS_I(inode)->reserved_extents); // line 7780
WARN_ON(BTRFS_I(inode)->delalloc_bytes); // line 7781
WARN_ON(BTRFS_I(inode)->csum_bytes); // line 7782
Here's the dmesg output for just the last set of errors (the other
WARN_ONs had similar backtraces):
[ 1557.218529] ------------[ cut here ]------------
[ 1557.218561] WARNING: at fs/btrfs/inode.c:7779
btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]()
[ 1557.218564] Hardware name: OptiPlex 745
[ 1557.218566] Modules linked in: iTCO_wdt iTCO_vendor_support lpc_ich
mfd_core xts gf128mul ablk_helper cryptd aes_x86_64 sha256_generic
btrfs libcrc32c
[ 1557.218582] Pid: 5728, comm: umount Tainted: G W 3.6.4-x+ #3
[ 1557.218584] Call Trace:
[ 1557.218592] [<ffffffff810350ea>] warn_slowpath_common+0x74/0xa2
[ 1557.218596] [<ffffffff81035132>] warn_slowpath_null+0x1a/0x1c
[ 1557.218612] [<ffffffffa00414c9>] btrfs_destroy_inode+0x2ac/0x2e6 [btrfs]
[ 1557.218618] [<ffffffff8113ef00>] destroy_inode+0x3c/0x5f
[ 1557.218622] [<ffffffff8113f045>] evict+0x122/0x1ac
[ 1557.218626] [<ffffffff8113f619>] dispose_list+0x3a/0x49
[ 1557.218629] [<ffffffff8113fd27>] evict_inodes+0x106/0x115
[ 1557.218635] [<ffffffff81127c32>] generic_shutdown_super+0x4c/0xdc
[ 1557.218639] [<ffffffff81127d44>] kill_anon_super+0x16/0x24
[ 1557.218650] [<ffffffffa000ad48>] btrfs_kill_super+0x1a/0x8f [btrfs]
[ 1557.218654] [<ffffffff81127f68>] deactivate_locked_super+0x34/0x5a
[ 1557.218658] [<ffffffff81128b60>] deactivate_super+0x4e/0x66
[ 1557.218663] [<ffffffff81142924>] mntput_no_expire+0xf7/0x14d
[ 1557.218666] [<ffffffff811437ad>] sys_umount+0x63/0x37a
[ 1557.218672] [<ffffffff81824c12>] system_call_fastpath+0x16/0x1b
[ 1557.218674] ---[ end trace 29a44c3c46b1a1b9 ]---
[ 1557.218676] ------------[ cut here ]------------
[ 1557.218691] WARNING: at fs/btrfs/inode.c:7780
btrfs_destroy_inode+0x296/0x2e6 [btrfs]()
[ 1557.218693] Hardware name: OptiPlex 745
[ 1557.218694] Modules linked in: iTCO_wdt iTCO_vendor_support lpc_ich
mfd_core xts gf128mul ablk_helper cryptd aes_x86_64 sha256_generic
btrfs libcrc32c
[ 1557.218708] Pid: 5728, comm: umount Tainted: G W 3.6.4-x+ #3
[ 1557.218709] Call Trace:
[ 1557.218714] [<ffffffff810350ea>] warn_slowpath_common+0x74/0xa2
[ 1557.218717] [<ffffffff81035132>] warn_slowpath_null+0x1a/0x1c
[ 1557.218733] [<ffffffffa00414b3>] btrfs_destroy_inode+0x296/0x2e6 [btrfs]
[ 1557.218737] [<ffffffff8113ef00>] destroy_inode+0x3c/0x5f
[ 1557.218741] [<ffffffff8113f045>] evict+0x122/0x1ac
[ 1557.218744] [<ffffffff8113f619>] dispose_list+0x3a/0x49
[ 1557.218748] [<ffffffff8113fd27>] evict_inodes+0x106/0x115
[ 1557.218752] [<ffffffff81127c32>] generic_shutdown_super+0x4c/0xdc
[ 1557.218757] [<ffffffff81127d44>] kill_anon_super+0x16/0x24
[ 1557.218767] [<ffffffffa000ad48>] btrfs_kill_super+0x1a/0x8f [btrfs]
[ 1557.218771] [<ffffffff81127f68>] deactivate_locked_super+0x34/0x5a
[ 1557.218775] [<ffffffff81128b60>] deactivate_super+0x4e/0x66
[ 1557.218779] [<ffffffff81142924>] mntput_no_expire+0xf7/0x14d
[ 1557.218783] [<ffffffff811437ad>] sys_umount+0x63/0x37a
[ 1557.218787] [<ffffffff81824c12>] system_call_fastpath+0x16/0x1b
[ 1557.218789] ---[ end trace 29a44c3c46b1a1ba ]---
[ 1557.218791] ------------[ cut here ]------------
[ 1557.218805] WARNING: at fs/btrfs/inode.c:7782
btrfs_destroy_inode+0x26a/0x2e6 [btrfs]()
[ 1557.218807] Hardware name: OptiPlex 745
[ 1557.218809] Modules linked in: iTCO_wdt iTCO_vendor_support lpc_ich
mfd_core xts gf128mul ablk_helper cryptd aes_x86_64 sha256_generic
btrfs libcrc32c
[ 1557.218822] Pid: 5728, comm: umount Tainted: G W 3.6.4-x+ #3
[ 1557.218823] Call Trace:
[ 1557.218827] [<ffffffff810350ea>] warn_slowpath_common+0x74/0xa2
[ 1557.218831] [<ffffffff81035132>] warn_slowpath_null+0x1a/0x1c
[ 1557.218847] [<ffffffffa0041487>] btrfs_destroy_inode+0x26a/0x2e6 [btrfs]
[ 1557.218851] [<ffffffff8113ef00>] destroy_inode+0x3c/0x5f
[ 1557.218854] [<ffffffff8113f045>] evict+0x122/0x1ac
[ 1557.218858] [<ffffffff8113f619>] dispose_list+0x3a/0x49
[ 1557.218862] [<ffffffff8113fd27>] evict_inodes+0x106/0x115
[ 1557.218866] [<ffffffff81127c32>] generic_shutdown_super+0x4c/0xdc
[ 1557.218870] [<ffffffff81127d44>] kill_anon_super+0x16/0x24
[ 1557.218881] [<ffffffffa000ad48>] btrfs_kill_super+0x1a/0x8f [btrfs]
[ 1557.218885] [<ffffffff81127f68>] deactivate_locked_super+0x34/0x5a
[ 1557.218889] [<ffffffff81128b60>] deactivate_super+0x4e/0x66
[ 1557.218893] [<ffffffff81142924>] mntput_no_expire+0xf7/0x14d
[ 1557.218897] [<ffffffff811437ad>] sys_umount+0x63/0x37a
[ 1557.218901] [<ffffffff81824c12>] system_call_fastpath+0x16/0x1b
[ 1557.218903] ---[ end trace 29a44c3c46b1a1bb ]---
[ 1557.895037] ------------[ cut here ]------------
[ 1557.895069] WARNING: at fs/btrfs/extent-tree.c:4417
btrfs_free_block_groups+0x2ad/0x34c [btrfs]()
[ 1557.895073] Hardware name: OptiPlex 745
[ 1557.895075] Modules linked in: iTCO_wdt iTCO_vendor_support lpc_ich
mfd_core xts gf128mul ablk_helper cryptd aes_x86_64 sha256_generic
btrfs libcrc32c
[ 1557.895097] Pid: 5728, comm: umount Tainted: G W 3.6.4-x+ #3
[ 1557.895100] Call Trace:
[ 1557.895112] [<ffffffff810350ea>] warn_slowpath_common+0x74/0xa2
[ 1557.895118] [<ffffffff81035132>] warn_slowpath_null+0x1a/0x1c
[ 1557.895136] [<ffffffffa0022769>] btrfs_free_block_groups+0x2ad/0x34c [btrfs]
[ 1557.895157] [<ffffffffa002e953>] close_ctree+0x1bc/0x2f1 [btrfs]
[ 1557.895165] [<ffffffff8113fd27>] ? evict_inodes+0x106/0x115
[ 1557.895179] [<ffffffffa0007075>] btrfs_put_super+0x19/0x1b [btrfs]
[ 1557.895187] [<ffffffff81127c41>] generic_shutdown_super+0x5b/0xdc
[ 1557.895193] [<ffffffff81127d44>] kill_anon_super+0x16/0x24
[ 1557.895208] [<ffffffffa000ad48>] btrfs_kill_super+0x1a/0x8f [btrfs]
[ 1557.895214] [<ffffffff81127f68>] deactivate_locked_super+0x34/0x5a
[ 1557.895220] [<ffffffff81128b60>] deactivate_super+0x4e/0x66
[ 1557.895226] [<ffffffff81142924>] mntput_no_expire+0xf7/0x14d
[ 1557.895231] [<ffffffff811437ad>] sys_umount+0x63/0x37a
[ 1557.895239] [<ffffffff81824c12>] system_call_fastpath+0x16/0x1b
[ 1557.895243] ---[ end trace 29a44c3c46b1a1bc ]---
[ 1557.895245] ------------[ cut here ]------------
[ 1557.895261] WARNING: at fs/btrfs/extent-tree.c:4418
btrfs_free_block_groups+0x347/0x34c [btrfs]()
[ 1557.895264] Hardware name: OptiPlex 745
[ 1557.895266] Modules linked in: iTCO_wdt iTCO_vendor_support lpc_ich
mfd_core xts gf128mul ablk_helper cryptd aes_x86_64 sha256_generic
btrfs libcrc32c
[ 1557.895285] Pid: 5728, comm: umount Tainted: G W 3.6.4-x+ #3
[ 1557.895287] Call Trace:
[ 1557.895294] [<ffffffff810350ea>] warn_slowpath_common+0x74/0xa2
[ 1557.895299] [<ffffffff81035132>] warn_slowpath_null+0x1a/0x1c
[ 1557.895317] [<ffffffffa0022803>] btrfs_free_block_groups+0x347/0x34c [btrfs]
[ 1557.895337] [<ffffffffa002e953>] close_ctree+0x1bc/0x2f1 [btrfs]
[ 1557.895343] [<ffffffff8113fd27>] ? evict_inodes+0x106/0x115
[ 1557.895358] [<ffffffffa0007075>] btrfs_put_super+0x19/0x1b [btrfs]
[ 1557.895364] [<ffffffff81127c41>] generic_shutdown_super+0x5b/0xdc
[ 1557.895370] [<ffffffff81127d44>] kill_anon_super+0x16/0x24
[ 1557.895385] [<ffffffffa000ad48>] btrfs_kill_super+0x1a/0x8f [btrfs]
[ 1557.895391] [<ffffffff81127f68>] deactivate_locked_super+0x34/0x5a
[ 1557.895397] [<ffffffff81128b60>] deactivate_super+0x4e/0x66
[ 1557.895402] [<ffffffff81142924>] mntput_no_expire+0xf7/0x14d
[ 1557.895407] [<ffffffff811437ad>] sys_umount+0x63/0x37a
[ 1557.895413] [<ffffffff81824c12>] system_call_fastpath+0x16/0x1b
[ 1557.895417] ---[ end trace 29a44c3c46b1a1bd ]---
[ 1557.895419] ------------[ cut here ]------------
[ 1557.895435] WARNING: at fs/btrfs/extent-tree.c:7687
btrfs_free_block_groups+0x23e/0x34c [btrfs]()
[ 1557.895438] Hardware name: OptiPlex 745
[ 1557.895440] Modules linked in: iTCO_wdt iTCO_vendor_support lpc_ich
mfd_core xts gf128mul ablk_helper cryptd aes_x86_64 sha256_generic
btrfs libcrc32c
[ 1557.895458] Pid: 5728, comm: umount Tainted: G W 3.6.4-x+ #3
[ 1557.895461] Call Trace:
[ 1557.895467] [<ffffffff810350ea>] warn_slowpath_common+0x74/0xa2
[ 1557.895472] [<ffffffff81035132>] warn_slowpath_null+0x1a/0x1c
[ 1557.895489] [<ffffffffa00226fa>] btrfs_free_block_groups+0x23e/0x34c [btrfs]
[ 1557.895510] [<ffffffffa002e953>] close_ctree+0x1bc/0x2f1 [btrfs]
[ 1557.895516] [<ffffffff8113fd27>] ? evict_inodes+0x106/0x115
[ 1557.895533] [<ffffffffa0007075>] btrfs_put_super+0x19/0x1b [btrfs]
[ 1557.895540] [<ffffffff81127c41>] generic_shutdown_super+0x5b/0xdc
[ 1557.895547] [<ffffffff81127d44>] kill_anon_super+0x16/0x24
[ 1557.895561] [<ffffffffa000ad48>] btrfs_kill_super+0x1a/0x8f [btrfs]
[ 1557.895567] [<ffffffff81127f68>] deactivate_locked_super+0x34/0x5a
[ 1557.895573] [<ffffffff81128b60>] deactivate_super+0x4e/0x66
[ 1557.895578] [<ffffffff81142924>] mntput_no_expire+0xf7/0x14d
[ 1557.895583] [<ffffffff811437ad>] sys_umount+0x63/0x37a
[ 1557.895588] [<ffffffff81824c12>] system_call_fastpath+0x16/0x1b
[ 1557.895591] ---[ end trace 29a44c3c46b1a1be ]---
[ 1557.895595] space_info 1 has 806678528 free, is not full
[ 1557.895600] space_info total=4303355904, used=3496611840, pinned=0,
reserved=0, may_use=2998272, readonly=65536
[ 1557.895603] ------------[ cut here ]------------
[ 1557.895619] WARNING: at fs/btrfs/extent-tree.c:7687
btrfs_free_block_groups+0x23e/0x34c [btrfs]()
[ 1557.895622] Hardware name: OptiPlex 745
[ 1557.895624] Modules linked in: iTCO_wdt iTCO_vendor_support lpc_ich
mfd_core xts gf128mul ablk_helper cryptd aes_x86_64 sha256_generic
btrfs libcrc32c
[ 1557.895643] Pid: 5728, comm: umount Tainted: G W 3.6.4-x+ #3
[ 1557.895646] Call Trace:
[ 1557.895652] [<ffffffff810350ea>] warn_slowpath_common+0x74/0xa2
[ 1557.895656] [<ffffffff81035132>] warn_slowpath_null+0x1a/0x1c
[ 1557.895673] [<ffffffffa00226fa>] btrfs_free_block_groups+0x23e/0x34c [btrfs]
[ 1557.895693] [<ffffffffa002e953>] close_ctree+0x1bc/0x2f1 [btrfs]
[ 1557.895699] [<ffffffff8113fd27>] ? evict_inodes+0x106/0x115
[ 1557.895716] [<ffffffffa0007075>] btrfs_put_super+0x19/0x1b [btrfs]
[ 1557.895723] [<ffffffff81127c41>] generic_shutdown_super+0x5b/0xdc
[ 1557.895729] [<ffffffff81127d44>] kill_anon_super+0x16/0x24
[ 1557.895743] [<ffffffffa000ad48>] btrfs_kill_super+0x1a/0x8f [btrfs]
[ 1557.895749] [<ffffffff81127f68>] deactivate_locked_super+0x34/0x5a
[ 1557.895754] [<ffffffff81128b60>] deactivate_super+0x4e/0x66
[ 1557.895760] [<ffffffff81142924>] mntput_no_expire+0xf7/0x14d
[ 1557.895764] [<ffffffff811437ad>] sys_umount+0x63/0x37a
[ 1557.895770] [<ffffffff81824c12>] system_call_fastpath+0x16/0x1b
[ 1557.895773] ---[ end trace 29a44c3c46b1a1bf ]---
[ 1557.895776] space_info 4 has 92979200 free, is not full
[ 1557.895780] space_info total=813694976, used=720715776, pinned=0,
reserved=0, may_use=26738688, readonly=0
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