Filesystem was being balanced with :
btrfs balance start -dusage=55 -musage=55 $filesystem
when this happened :
------------[ cut here ]------------
WARNING: CPU: 2 PID: 31502 at fs/btrfs/extent-tree.c:2025
__btrfs_inc_extent_ref.isra.51+0x210/0x280 [btrfs]()
BTRFS: Transaction aborted (error -17)
Modules linked in: xt_multiport nf_log_ipv4 nf_log_common xt_LOG
xt_tcpudp iptable_filter ip_tables x_tables ppdev evdev kvm_amd wctdm(O)
serio_raw kvm snd_hda_codec_realtek pcspkr edac_mce_amd
snd_hda_codec_generic dahdi(O) radeon edac_core k10temp
snd_hda_codec_hdmi crc_ccitt ttm snd_hda_intel drm_kms_helper
snd_hda_codec drm snd_hda_core i2c_algo_bit snd_hwdep wmi snd_pcm
parport_pc 8250_fintek asus_atk0110 parport tpm_tis snd_timer
acpi_cpufreq sp5100_tco tpm snd i2c_piix4 processor button soundcore
i2c_core shpchp thermal_sys loop fuse autofs4 crc32c_generic btrfs xor
raid6_pq sg usb_storage sd_mod ata_generic ohci_pci ahci pata_atiixp
libahci xhci_pci libata ohci_hcd ehci_pci xhci_hcd ehci_hcd scsi_mod
r8169 usbcore mii usb_common
CPU: 2 PID: 31502 Comm: kworker/u16:1 Tainted: G O
4.2.0-rc3-dg1 #1
Hardware name: System manufacturer System Product Name/M5A88-M, BIOS
1101 03/16/2012
Workqueue: btrfs-extent-refs btrfs_extent_refs_helper [btrfs]
0000000000000000 ffffffffa02b98a7 ffffffff81540a6f ffff880107383b28
ffffffff8106dfa1 ffff88040c955800 ffff8801003612f8 ffff8800441bfda0
00000a6f8acba000 0000000000003fa4 ffffffff8106e01a ffffffffa02bbc48
Call Trace:
[<ffffffff81540a6f>] ? dump_stack+0x40/0x50
[<ffffffff8106dfa1>] ? warn_slowpath_common+0x81/0xb0
[<ffffffff8106e01a>] ? warn_slowpath_fmt+0x4a/0x50
[<ffffffffa0222390>] ? __btrfs_inc_extent_ref.isra.51+0x210/0x280 [btrfs]
[<ffffffffa0229e1f>] ? __btrfs_run_delayed_refs+0xd1f/0x10a0 [btrfs]
[<ffffffff8101cc65>] ? sched_clock+0x5/0x10
[<ffffffff811bd0c2>] ? __sb_start_write+0x42/0xe0
[<ffffffffa022e26a>] ? btrfs_run_delayed_refs.part.73+0x6a/0x280 [btrfs]
[<ffffffffa022e518>] ? delayed_ref_async_start+0x78/0x90 [btrfs]
[<ffffffffa026eb6c>] ? normal_work_helper+0xbc/0x260 [btrfs]
[<ffffffff81084e01>] ? process_one_work+0x151/0x3d0
[<ffffffff81085805>] ? worker_thread+0x65/0x470
[<ffffffff8154226d>] ? __schedule+0x28d/0x8a0
[<ffffffff810857a0>] ? rescuer_thread+0x310/0x310
[<ffffffff8108ac23>] ? kthread+0xd3/0xf0
[<ffffffff8108ab50>] ? kthread_create_on_node+0x180/0x180
[<ffffffff8154699f>] ? ret_from_fork+0x3f/0x70
[<ffffffff8108ab50>] ? kthread_create_on_node+0x180/0x180
---[ end trace cc878b7b9dc6406e ]---
BTRFS: error (device sdc1) in __btrfs_inc_extent_ref:2025: errno=-17
Object already exists
BTRFS info (device sdc1): forced readonly
BTRFS: error (device sdc1) in btrfs_run_delayed_refs:2781: errno=-17
Object already exists
mount options:
kernel: vanilla 4.2.0-rc3
root@apple:~# btrfs check --repair /dev/sdc1
enabling repair mode
Checking filesystem on /dev/sdc1
UUID: 56805391-52a7-4621-bc83-6622e59e1e63
checking extents
Fixed 0 roots.
checking free space cache
cache and super generation don't match, space cache will be invalidated
checking fs roots
checking csums
checking root refs
found 1495257949968 bytes used err is 0
total csum bytes: 1449666724
total tree bytes: 10806792192
total fs tree bytes: 8529129472
total extent tree bytes: 543883264
btree space waste bytes: 2367868291
file data blocks allocated: 1644889620480
referenced 1580747583488
btrfs-progs v4.0
root@apple:~# btrfs fi sh /backup/
Label: 'BACKUP2' uuid: 56805391-52a7-4621-bc83-6622e59e1e63
Total devices 2 FS bytes used 1.36TiB
devid 1 size 2.73TiB used 1.46TiB path /dev/sda1
devid 2 size 2.73TiB used 1.46TiB path /dev/sdc1
btrfs-progs v4.0
root@apple:~# btrfs fi us /backup/
WARNING: MIXED blockgroups not handled
Overall:
Device size: 5.46TiB
Device allocated: 5.85TiB
Device unallocated: 16.00EiB
Device missing: 0.00B
Used: 5.44TiB
Free (estimated): 8.00EiB (min: 8.00EiB)
Data ratio: 2.00
Metadata ratio: 2.00
Global reserve: 512.00MiB (used: 0.00B)
Data+Metadata,RAID1: Size:1.46TiB, Used:1.36TiB
/dev/sda1 1.46TiB
/dev/sdc1 1.46TiB
System,RAID1: Size:64.00MiB, Used:232.00KiB
/dev/sda1 64.00MiB
/dev/sdc1 64.00MiB
Unallocated:
/dev/sda1 1.27TiB
/dev/sdc1 1.27TiB
mount | grep sda1 :
/dev/sda1 on /backup type btrfs
(rw,noatime,compress=lzo,space_cache,autodefrag,subvolid=5,subvol=/)
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