On 11 December 2014 at 23:00, Robert White <rwh...@pobox.com> wrote:
> On 12/11/2014 12:18 AM, Patrik Lundquist wrote:
>>
>> * Full balance, that ended with "98 enospc errors during balance."
>
> Assuming that quote is an actual quote from the output of the balance...

It is, from dmesg.


> "Bugs" are unexpected things that cause failures and/or damage.

Not all errors are as pretty as

BTRFS info (device sdc1): relocating block group 1756675178496 flags 1
BTRFS error (device sdc1): allocation failed flags 1, wanted 1272844288
BTRFS: space_info 1 has 13703077888 free, is not full
BTRFS: space_info total=1504312295424, used=1487622750208, pinned=0,
reserved=2986196992, may_use=1308749824, readonly=270336

some are

BTRFS info (device sdc1): relocating block group 1780297498624 flags 1
------------[ cut here ]------------
WARNING: CPU: 2 PID: 11094 at
/build/linux-Y9HjRe/linux-3.16.7/fs/btrfs/extent-tree.c:7280
btrfs_alloc_free_block+0x219/0x450 [btrfs]()
BTRFS: block rsv returned -28
Modules linked in: nfsd auth_rpcgss oid_registry nfs_acl nfs lockd
fscache sunrpc btrfs xor nls_utf8 nls_cp437 vfat fat kvm_intel
raid6_pq kvm crc32_pclmul jc42 coretemp ghash_clmulni_intel iTCO_wdt
ipmi_watchdog iTCO_vendor_support aesni_intel joydev aes_x86_64
efi_pstore lrw gf128mul evdev glue_helper ast ablk_helper lpc_ich
cryptd ttm pcspkr efivars mfd_core i2c_i801 drm_kms_helper drm tpm_tis
tpm acpi_cpufreq i2c_ismt shpchp button processor thermal_sys ipmi_si
ipmi_poweroff ipmi_devintf ipmi_msghandler autofs4 ext4 crc16 mbcache
jbd2 sg sd_mod crc_t10dif crct10dif_generic hid_generic usbhid hid
ahci libahci crct10dif_pclmul crct10dif_common crc32c_intel igb libata
ehci_pci i2c_algo_bit xhci_hcd ehci_hcd i2c_core dca scsi_mod ptp
usbcore pps_core usb_common
CPU: 2 PID: 11094 Comm: btrfs Tainted: G        W     3.16.0-4-amd64
#1 Debian 3.16.7-2
Hardware name: Supermicro A1SAi/A1SAi, BIOS 1.0c 02/27/2014
 0000000000000009 ffffffff81506b43 ffff88032779f780 ffffffff81065717
 ffff88032d68a640 ffff88032779f7d0 0000000000001000 ffff8803117df480
 0000000000000000 ffffffff8106577c ffffffffa0536338 0000000000000020
Call Trace:
 [<ffffffff81506b43>] ? dump_stack+0x41/0x51
 [<ffffffff81065717>] ? warn_slowpath_common+0x77/0x90
 [<ffffffff8106577c>] ? warn_slowpath_fmt+0x4c/0x50
 [<ffffffffa04a8b09>] ? btrfs_alloc_free_block+0x219/0x450 [btrfs]
 [<ffffffff81142bf6>] ? free_hot_cold_page_list+0x46/0x90
 [<ffffffffa04dc5c8>] ? read_extent_buffer+0xc8/0x120 [btrfs]
 [<ffffffffa0492c31>] ? btrfs_copy_root+0x101/0x2e0 [btrfs]
 [<ffffffffa05032d1>] ? create_reloc_root+0x201/0x2d0 [btrfs]
 [<ffffffffa0509398>] ? btrfs_init_reloc_root+0x98/0xb0 [btrfs]
 [<ffffffffa04b9564>] ? record_root_in_trans+0xa4/0xf0 [btrfs]
 [<ffffffffa04ba95f>] ? btrfs_record_root_in_trans+0x3f/0x70 [btrfs]
 [<ffffffffa04bb940>] ? start_transaction+0x90/0x560 [btrfs]
 [<ffffffffa04c605a>] ? btrfs_evict_inode+0x33a/0x4d0 [btrfs]
 [<ffffffff811bf0ec>] ? evict+0xac/0x170
 [<ffffffffa04c0762>] ? btrfs_run_delayed_iputs+0xd2/0xf0 [btrfs]
 [<ffffffffa04bb812>] ? btrfs_commit_transaction+0x922/0x9c0 [btrfs]
 [<ffffffffa04bb940>] ? start_transaction+0x90/0x560 [btrfs]
 [<ffffffffa0504ea4>] ? prepare_to_relocate+0xf4/0x1b0 [btrfs]
 [<ffffffffa0509e72>] ? relocate_block_group+0x42/0x670 [btrfs]
 [<ffffffffa050a667>] ? btrfs_relocate_block_group+0x1c7/0x2d0 [btrfs]
 [<ffffffffa04e0432>] ? btrfs_relocate_chunk.isra.27+0x62/0x700 [btrfs]
 [<ffffffffa04928d1>] ? btrfs_set_path_blocking+0x31/0x70 [btrfs]
 [<ffffffffa0497d8d>] ? btrfs_search_slot+0x4ad/0xad0 [btrfs]
 [<ffffffffa04d1fd5>] ? btrfs_get_token_64+0x55/0xf0 [btrfs]
 [<ffffffffa04e355b>] ? btrfs_balance+0x82b/0xe80 [btrfs]
 [<ffffffffa04eaba4>] ? btrfs_ioctl_balance+0x154/0x500 [btrfs]
 [<ffffffffa04ef89c>] ? btrfs_ioctl+0x58c/0x2b10 [btrfs]
 [<ffffffff811670f1>] ? handle_mm_fault+0xa91/0x11a0
 [<ffffffff810562a1>] ? __do_page_fault+0x1d1/0x4e0
 [<ffffffff8116afc1>] ? vma_link+0xb1/0xc0
 [<ffffffff811b788f>] ? do_vfs_ioctl+0x2cf/0x4b0
 [<ffffffff811b7af1>] ? SyS_ioctl+0x81/0xa0
 [<ffffffff8150ecc8>] ? page_fault+0x28/0x30
 [<ffffffff8150cc2d>] ? system_call_fast_compare_end+0x10/0x15
---[ end trace 880987d36ae50245 ]---
BTRFS error (device sdc1): allocation failed flags 1, wanted 2013265920
BTRFS: space_info 1 has 8384299008 free, is not full
BTRFS: space_info total=1500017328128, used=1491533037568, pinned=0,
reserved=99807232, may_use=2147475456, readonly=184320
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