I suspect this might be related to previous btrfs errors I've had on
the same filesystem. See:
http://python.ca/nas/linux/btrfs_bug.txt
The most recent kernel message is:
WARNING: at fs/btrfs/extent-tree.c:8239 btrfs_free_block_groups+0x218/0x275()
Hardware name: MS-7388
Modules linked in: udf crc_itu_t isofs loop nls_iso8859_1 vboxnetflt vboxdrv nls_utf8 nls_cp437 vfat fat kvm_amd kvm ipv6 fuse f71882fg snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd soundcore r8169 i2c_piix4 snd_page_alloc usblp
Pid: 13197, comm: umount Tainted: G W 2.6.37-rc8 #54
Call Trace:
[<ffffffff810398d3>] warn_slowpath_common+0x80/0x98
[<ffffffff81039900>] warn_slowpath_null+0x15/0x17
[<ffffffff81155aec>] btrfs_free_block_groups+0x218/0x275
[<ffffffff81164597>] close_ctree+0x183/0x344
[<ffffffff810bc2c5>] ? destroy_inode+0x38/0x4e
[<ffffffff810bc385>] ? dispose_list+0xaa/0xc0
[<ffffffff8114a040>] btrfs_put_super+0x18/0x27
[<ffffffff810ac3a2>] generic_shutdown_super+0x66/0xe1
[<ffffffff810ac468>] kill_anon_super+0x11/0x49
[<ffffffff810ab6fa>] deactivate_locked_super+0x21/0x41
[<ffffffff810abba6>] deactivate_super+0x40/0x44
[<ffffffff810bfcfe>] mntput_no_expire+0xdd/0x10b
[<ffffffff810c0276>] sys_umount+0x2d2/0x2fd
[<ffffffff810028bb>] system_call_fastpath+0x16/0x1b
---[ end trace 3f9c8cf600895a9f ]---
space_info has 1751910400 free, is not full
space_info total=5377097728, used=3611955200, pinned=0, reserved=4843520, may_use=0, readonly=8388608
The code is:
while(!list_empty(&info->space_info)) {
space_info = list_entry(info->space_info.next,
struct btrfs_space_info,
list);
if (space_info->bytes_pinned > 0 ||
space_info->bytes_reserved > 0) {
WARN_ON(1);
dump_space_info(space_info, 0, 0);
}
list_del(&space_info->list);
kfree(space_info);
}
return 0;
When I tried btrfsck, I get:
btrfsck: btrfsck.c:584: splice_shared_node: Assertion `!(src == &src_node->root_cache)' failed.
I'm making heavy use of subvolume snapshots. The partition is
being used for backups and I use 'rsync --inplace' along with the
CoW feature to preserve space.
Regards,
Neil
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