我的家庭服务器使用的是 BTRFS 设置，其中有 3 个磁盘组成 btrfs-raid，第四个磁盘用于通过以下方式接收每日备份快照：BTRBK几天前我注意到，BTRBK 出现错误，因为无法将快照发送到备份磁盘，因为它是以只读方式安装的。深入挖掘后，我发现存在 I/O 错误（dmesg：BTRFS：错误（设备 sde）在 btrfs_run_delayed_refs：2978：errno=-5 IO 故障）。我没能修复这些错误，但最终在备份磁盘上重新创建了文件系统。现在它运行良好，已经超过一周了，现在我看到了同样的错误。
现在，我不确定这个故障是由于 BTRFS 中的错误、BTRBK 中的错误还是我的硬盘即将损坏（实际上它已经很旧了）。您能帮我找出发生了什么吗？
系统：Ubuntu 16.04.6 LTS，主线内核 4.20.17-042017-generic x86_64 btrfs-progs v4.14.1 BTRBK 版本：0.22.2
BTRBK 日志：
localtime type status duration target_url source_url parent_url message
2020-02-03T06:25:11+0100 startup v0.22.2 - - - - # btrbk command line client, version 0.22.2
2020-02-03T06:25:11+0100 snapshot starting - /mnt/dp0/snapshots/seafile.20200203 /mnt/dp0/seafile - -
2020-02-03T06:25:11+0100 snapshot success 0 /mnt/dp0/snapshots/seafile.20200203 /mnt/dp0/seafile - -
2020-02-03T06:25:11+0100 send-receive starting - /mnt/bp0/seafile/seafile.20200203 /mnt/dp0/snapshots/seafile.20200203 /mnt/dp0/snapshots/seafile.20200202 -
2020-02-03T06:25:11+0100 send-receive ERROR 18 /mnt/bp0/seafile/seafile.20200203 /mnt/dp0/snapshots/seafile.20200203 /mnt/dp0/snapshots/seafile.20200202 -
2020-02-03T06:25:29+0100 delete_garbled starting - /mnt/bp0/seafile/seafile.20200203 - - -
2020-02-03T06:25:29+0100 delete_garbled ERROR 0 /mnt/bp0/seafile/seafile.20200203 - - -
2020-02-03T06:25:29+0100 abort_target ABORT - /mnt/bp0/seafile - - # Failed to send/receive subvolume
2020-02-03T06:25:29+0100 finished partial 18 - - - # At least one backup task aborted
localtime type status duration target_url source_url parent_url message
2020-02-04T06:25:10+0100 startup v0.22.2 - - - - # btrbk command line client, version 0.22.2
2020-02-04T06:25:11+0100 snapshot starting - /mnt/dp0/snapshots/seafile.20200204 /mnt/dp0/seafile - -
2020-02-04T06:25:11+0100 snapshot success 0 /mnt/dp0/snapshots/seafile.20200204 /mnt/dp0/seafile - -
2020-02-04T06:25:11+0100 abort_target ABORT - /mnt/bp0/seafile - - # Target subvolume "/mnt/bp0/seafile/seafile.20200203" already exists
2020-02-04T06:25:11+0100 finished partial 1 - - - # At least one backup task aborted
系统日志：
Feb 4 06:25:04 somehost kernel: [41566.737968] BTRFS info (device sde): use zstd compression, level 0
Feb 4 06:25:04 somehost kernel: [41566.737969] BTRFS info (device sde): disk space caching is enabled
Feb 4 06:25:04 somehost kernel: [41566.737970] BTRFS info (device sde): has skinny extents
Feb 4 06:25:08 somehost kernel: [41570.639345] BTRFS info (device sde): balance: resuming
Feb 4 06:25:11 somehost kernel: [41572.990217] BTRFS info (device sde): relocating block group 1074173837312 flags data
Feb 4 06:25:14 somehost kernel: [41576.298186] BTRFS info (device sde): found 23 extents
Feb 4 06:25:15 somehost kernel: [41577.855201] WARNING: CPU: 2 PID: 17198 at fs/btrfs/extent-tree.c:1552 lookup_inline_extent_backref+0x57c/0x5c0 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855203] Modules linked in: binfmt_misc nls_iso8859_1 ext2 intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp intel_cstate intel_rapl_perf input_leds mei_me joydev mei mac_hid acpi_pad ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic usbhid hid i915 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel kvmgt vfio_mdev mdev vfio_iommu_type1 vfio kvm irqbypass drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm aesni_intel drm_panel_orientation_quirks aes_x86_64 cfbfillrect crypto_simd cfbimgblt cfbcopyarea cryptd fb glue_helper igb fbdev e1000e dca i2c_algo_bit ahci i2c_core libahci video
Feb 4 06:25:15 somehost kernel: [41577.855225] CPU: 2 PID: 17198 Comm: btrfs-balance Not tainted 4.20.17-042017-generic #201903190933
Feb 4 06:25:15 somehost kernel: [41577.855226] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./H270M-ITX/ac, BIOS P2.00 03/29/2017
Feb 4 06:25:15 somehost kernel: [41577.855244] RIP: 0010:lookup_inline_extent_backref+0x57c/0x5c0 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855245] Code: 9d 60 ff ff ff 4c 8b a5 58 ff ff ff e9 37 fe ff ff 48 8b 9d 60 ff ff ff b8 8b ff ff ff e9 f8 fb ff ff 45 31 ed e9 9d fc ff ff <0f> 0b b8 fb ff ff ff e9 e4 fb ff ff 80 7d b6 bf 0f 87 5a fe ff ff
Feb 4 06:25:15 somehost kernel: [41577.855246] RSP: 0018:ffffaf8f41c7b838 EFLAGS: 00010202
Feb 4 06:25:15 somehost kernel: [41577.855247] RAX: 0000000000000001 RBX: ffff9ef8dfe36c40 RCX: 0000000000000000
Feb 4 06:25:15 somehost kernel: [41577.855248] RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000000
Feb 4 06:25:15 somehost kernel: [41577.855248] RBP: ffffaf8f41c7b8e0 R08: 0000000000000000 R09: 0000000000000000
Feb 4 06:25:15 somehost kernel: [41577.855249] R10: 0000000000000000 R11: ffff9ef680000000 R12: 0000000001f80000
Feb 4 06:25:15 somehost kernel: [41577.855250] R13: 0000000000000000 R14: ffff9ef8e482f0d0 R15: 0000000000004000
Feb 4 06:25:15 somehost kernel: [41577.855251] FS: 0000000000000000(0000) GS:ffff9ef8e6f00000(0000) knlGS:0000000000000000
Feb 4 06:25:15 somehost kernel: [41577.855252] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Feb 4 06:25:15 somehost kernel: [41577.855253] CR2: 000055efd408d920 CR3: 000000026160a001 CR4: 00000000003606e0
Feb 4 06:25:15 somehost kernel: [41577.855253] Call Trace:
Feb 4 06:25:15 somehost kernel: [41577.855276] ? set_extent_buffer_dirty+0x16/0xa0 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855293] insert_inline_extent_backref+0x51/0xe0 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855295] ? _cond_resched+0x19/0x30
Feb 4 06:25:15 somehost kernel: [41577.855312] __btrfs_inc_extent_ref.isra.66+0x7b/0x220 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855329] btrfs_run_delayed_refs_for_head+0x326/0x930 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855348] ? btrfs_get_token_64+0x105/0x120 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855369] ? btrfs_merge_delayed_refs+0x330/0x380 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855386] __btrfs_run_delayed_refs+0xa1/0x770 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855403] btrfs_run_delayed_refs+0x73/0x190 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855421] btrfs_commit_transaction+0x52/0x840 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855441] prepare_to_merge+0x1e4/0x210 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855461] relocate_block_group+0x40e/0x4c7 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855479] btrfs_relocate_block_group.cold.50+0x4d/0xfd [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855499] btrfs_relocate_chunk+0x36/0xb0 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855519] __btrfs_balance+0x51d/0xbb0 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855538] ? insert_balance_item.isra.42+0xb8/0x390 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855559] btrfs_balance+0x306/0x510 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855579] balance_kthread.cold.71+0x20/0x27 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855582] kthread+0x120/0x140
Feb 4 06:25:15 somehost kernel: [41577.855602] ? btrfs_balance+0x510/0x510 [btrfs]
Feb 4 06:25:15 somehost kernel: [41577.855603] ? __kthread_parkme+0x70/0x70
Feb 4 06:25:15 somehost kernel: [41577.855605] ret_from_fork+0x35/0x40
Feb 4 06:25:15 somehost kernel: [41577.855607] ---[ end trace 137afcdc172cbf0a ]---
Feb 4 06:25:15 somehost kernel: [41577.855610] BTRFS: error (device sde) in btrfs_run_delayed_refs:2978: errno=-5 IO failure
Feb 4 06:25:15 somehost kernel: [41577.855649] BTRFS info (device sde): forced readonly
Feb 4 06:25:15 somehost kernel: [41577.856115] BTRFS error (device sde): pending csums is 1310720
/dev/sde 的 SMART 状态：
smartctl 6.5 2016-01-24 r4214 [x86_64-linux-4.20.17-042017-generic] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Hitachi Deskstar 5K3000
Device Model: Hitachi HDS5C3030BLE630
***STRIPPED***
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
***STRIPPED***
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000b 100 100 016 Pre-fail Always - 0
2 Throughput_Performance 0x0005 144 144 054 Pre-fail Offline - 82
3 Spin_Up_Time 0x0007 139 139 024 Pre-fail Always - 395 (Average 395)
4 Start_Stop_Count 0x0012 100 100 000 Old_age Always - 2544
5 Reallocated_Sector_Ct 0x0033 100 100 005 Pre-fail Always - 0
7 Seek_Error_Rate 0x000b 100 100 067 Pre-fail Always - 0
8 Seek_Time_Performance 0x0005 138 138 020 Pre-fail Offline - 33
9 Power_On_Hours 0x0012 098 098 000 Old_age Always - 18000
10 Spin_Retry_Count 0x0013 100 100 060 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 652
192 Power-Off_Retract_Count 0x0032 098 098 000 Old_age Always - 2612
193 Load_Cycle_Count 0x0012 098 098 000 Old_age Always - 2612
194 Temperature_Celsius 0x0002 193 193 000 Old_age Always - 31 (Min/Max 1/48)
196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always - 0
197 Current_Pending_Sector 0x0022 100 100 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0008 100 100 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x000a 200 200 000 Old_age Always - 0
SMART Error Log Version: 1
No Errors Logged
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Short offline Completed without error 00% 17730 -
# 2 Short offline Completed without error 00% 17696 -
# 3 Extended offline Completed without error 00% 17675 -
SMART Selective self-test log data structure revision number 1
SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS
1 0 0 Not_testing
2 0 0 Not_testing
3 0 0 Not_testing
4 0 0 Not_testing
5 0 0 Not_testing```
提前致谢！ sandman