Is your btrfs on an external drive and did you remove the drive and then
try to unmount the filesystem ?

Thanks -
Manish


On Wed, Aug 27, 2014 at 1:22 PM, nick [off-list ref] wrote:

When booting on an Ubuntu kernel I am hitting this in my dmesg with an
external drive I have.
I am wondering if this is a bug or just a common issue.
8518.918519] ------------[ cut here ]------------
[ 8518.918528] WARNING: CPU: 1 PID: 13778 at
/build/buildd/linux-3.13.0/fs/btrfs/super.c:254
__btrfs_abort_transaction+0x50/0x110 [btrfs]()
[ 8518.918529] btrfs: Transaction aborted (error -5)
[ 8518.918530] Modules linked in: btrfs raid6_pq libcrc32c xor ses
enclosure usb_storage bnep rfcomm bluetooth hid_generic usbhid hid
eeepc_wmi asus_wmi sparse_keymap intel_rapl x86_pkg_temp_thermal
intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel snd_hda_codec_hdmi aesni_intel aes_x86_64 lrw gf128mul
glue_helper ablk_helper cryptd serio_raw snd_hda_codec_realtek lpc_ich
snd_hda_intel snd_hda_codec snd_hwdep snd_seq_midi snd_seq_midi_event
snd_pcm snd_rawmidi snd_page_alloc fglrx(POF) snd_seq parport_pc
snd_seq_device snd_timer ppdev wmi mei_me snd mei mac_hid lp parport
soundcore amd_iommu_v2 video ahci libahci r8169 mii
[ 8518.918560] CPU: 1 PID: 13778 Comm: umount Tainted: PF       W  O
3.13.0-34-generic #60-Ubuntu
[ 8518.918561] Hardware name: System manufacturer System Product
Name/P8Z68-V LE, BIOS 3506 01/17/2012
[ 8518.918562]  0000000000000009 ffff8801c9ad5c50 ffffffff8171bd94
ffff8801c9ad5c98
[ 8518.918564]  ffff8801c9ad5c88 ffffffff810676cd 00000000fffffffb
ffff880211d72800
[ 8518.918566]  ffff8801c49d8000 ffffffffa0bb2e90 000000000000060b
ffff8801c9ad5ce8
[ 8518.918568] Call Trace:
[ 8518.918573]  [<ffffffff8171bd94>] dump_stack+0x45/0x56
[ 8518.918576]  [<ffffffff810676cd>] warn_slowpath_common+0x7d/0xa0
[ 8518.918578]  [<ffffffff8106773c>] warn_slowpath_fmt+0x4c/0x50
[ 8518.918583]  [<ffffffffa0b16f00>] __btrfs_abort_transaction+0x50/0x110
[btrfs]
[ 8518.918591]  [<ffffffffa0b40ebe>] cleanup_transaction+0x6e/0x290 [btrfs]
[ 8518.918594]  [<ffffffff810aaf00>] ? prepare_to_wait_event+0x100/0x100
[ 8518.918601]  [<ffffffffa0b41e3a>] btrfs_commit_transaction+0x6ea/0x970
[btrfs]
[ 8518.918608]  [<ffffffffa0b3c00f>] btrfs_commit_super+0x8f/0xa0 [btrfs]
[ 8518.918614]  [<ffffffffa0b3dac0>] close_ctree+0x1e0/0x290 [btrfs]
[ 8518.918617]  [<ffffffff811d8c2c>] ? evict_inodes+0x11c/0x130
[ 8518.918622]  [<ffffffffa0b139b9>] btrfs_put_super+0x19/0x20 [btrfs]
[ 8518.918625]  [<ffffffff811beda2>] generic_shutdown_super+0x72/0xf0
[ 8518.918627]  [<ffffffff811befe2>] kill_anon_super+0x12/0x20
[ 8518.918631]  [<ffffffffa0b15eb6>] btrfs_kill_super+0x16/0x90 [btrfs]
[ 8518.918634]  [<ffffffff811bf33d>] deactivate_locked_super+0x3d/0x60
[ 8518.918636]  [<ffffffff811bf8f6>] deactivate_super+0x46/0x60
[ 8518.918638]  [<ffffffff811dc5f6>] mntput_no_expire+0xd6/0x170
[ 8518.918640]  [<ffffffff811ddb6e>] SyS_umount+0x8e/0x100
[ 8518.918642]  [<ffffffff8172c97f>] tracesys+0xe1/0xe6
[ 8518.918644] ---[ end trace 1a6b295c1d8ad4c3 ]---
Nick

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