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I am getting this error when I try to back up my @home btrfs subvolume from my laptop running Arch Linux to my external drive. This seems like a straightforward error, but the strange thing is that I can back up two other subvolumes without seeing any errors. My backup drive is a 1TB Western Digital internal SATA drive that I have connected using a Sabrent hard drive power adapter and an eSATA to SATA cable. The message below seems to only apply when I try to back up @home.

$ btrfs send hd/\@home-2016-02-04/ | btrfs receive bu
At subvol hd/@home-2016-02-04/
At subvol @home-2016-02-04
ERROR: send ioctl failed with -5: Input/output error
ERROR: unexpected EOF in stream.
$

The hd and bu directories are mounted to to top level of my laptop's internal drive and my backup drive, respectively. Also, I have run btrfs scrub start hd/\@home and it found one "uncorrectable error."

I have several questions:

  • Does anyone know what this error means?
  • What causes this error?
  • How do I fix this problem?

Here is the dmesg output of starting at the beginning of an attempt to send the subvolume.

[   32.209649] BTRFS error (device sda3): could not find root 8
[   32.210105] BTRFS error (device sda3): could not find root 8
[   32.222637] BTRFS error (device sda3): could not find root 8
[   32.223030] BTRFS error (device sda3): could not find root 8
[   34.527358] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   34.527361] Bluetooth: BNEP filters: protocol multicast
[   34.527366] Bluetooth: BNEP socket layer initialized
[   46.506005] NVRM: Your system is not currently configured to drive a VGA console
[   46.506009] NVRM: on the primary VGA device. The NVIDIA Linux graphics driver
[   46.506010] NVRM: requires the use of a text-mode VGA console. Use of other console
[   46.506012] NVRM: drivers including, but not limited to, vesafb, may result in
[   46.506013] NVRM: corruption and stability problems, and is not supported.
[   46.581646] dell_wmi: Unknown WMI event type 0x11: 0xffd0
[   46.607577] IPv6: ADDRCONF(NETDEV_UP): wlp12s0: link is not ready
[   46.666191] IPv6: ADDRCONF(NETDEV_UP): enp0s25: link is not ready
[   46.877179] IPv6: ADDRCONF(NETDEV_UP): enp0s25: link is not ready
[   47.887409] dell_wmi: Unknown WMI event type 0x11: 0xffd1
[ 1402.840138] ERROR @wl_notify_scan_status : wlp12s0 Scan_results error (-22)
[ 1773.586469] dell_wmi: Unknown WMI event type 0x11: 0xffd0
[ 1927.838434] dell_wmi: Unknown WMI event type 0x11: 0xffd1
[ 2225.726153] ata5: exception Emask 0x50 SAct 0x0 SErr 0x40d0800 action 0xe frozen
[ 2225.726165] ata5: irq_stat 0x00400040, connection status changed
[ 2225.726173] ata5: SError: { HostInt PHYRdyChg CommWake 10B8B DevExch }
[ 2225.726185] ata5: hard resetting link
[ 2227.410095] ata5: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 2227.423783] ata5.00: ATA-9: WDC WD10EZEX-22BN5A0, 01.01A01, max UDMA/133
[ 2227.423790] ata5.00: 1953525168 sectors, multi 0: LBA48 NCQ (depth 31/32), AA
[ 2227.425307] ata5.00: configured for UDMA/133
[ 2227.425322] ata5: EH complete
[ 2227.425564] scsi 4:0:0:0: Direct-Access     ATA      WDC WD10EZEX-22B 1A01 PQ: 0 ANSI: 5
[ 2227.425943] sd 4:0:0:0: [sdb] 1953525168 512-byte logical blocks: (1.00 TB/931 GiB)
[ 2227.425948] sd 4:0:0:0: [sdb] 4096-byte physical blocks
[ 2227.426024] sd 4:0:0:0: [sdb] Write Protect is off
[ 2227.426029] sd 4:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 2227.426063] sd 4:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 2227.490362]  sdb: sdb1
[ 2227.490756] sd 4:0:0:0: [sdb] Attached SCSI removable disk
[ 2227.761449] BTRFS: device fsid 9e494ae3-80dc-463f-8470-95de63236458 devid 1 transid 1407 /dev/sdb1
[ 2274.190804] BTRFS info (device sdb1): disk space caching is enabled
[ 2274.190807] BTRFS: has skinny extents
[ 2280.668547] ata5: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xe frozen
[ 2280.668554] ata5: irq_stat 0x00400040, connection status changed
[ 2280.668558] ata5: SError: { PHYRdyChg DevExch }
[ 2280.668563] ata5: hard resetting link
[ 2284.779862] ata5: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 2284.795950] ata5.00: configured for UDMA/133
[ 2284.795958] ata5: EH complete
[ 2291.074138] ata5: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xe frozen
[ 2291.074151] ata5: irq_stat 0x00400040, connection status changed
[ 2291.074158] ata5: SError: { PHYRdyChg DevExch }
[ 2291.074167] ata5: hard resetting link
[ 2295.323391] ata5: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 2295.331830] ata5.00: configured for UDMA/133
[ 2295.331838] ata5: EH complete
[ 2302.760251] ata5: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xe frozen
[ 2302.760264] ata5: irq_stat 0x00400040, connection status changed
[ 2302.760271] ata5: SError: { PHYRdyChg DevExch }
[ 2302.760282] ata5: hard resetting link
[ 2303.479863] ata5: SATA link down (SStatus 0 SControl 300)
[ 2303.821847] ata5: hard resetting link
[ 2304.140154] ata5: SATA link down (SStatus 0 SControl 300)
[ 2304.140180] ata5: limiting SATA link speed to 1.5 Gbps
[ 2304.977828] ata5: hard resetting link
[ 2309.146521] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[ 2309.155122] ata5.00: configured for UDMA/133
[ 2309.155135] ata5: EH complete
[ 2309.921108] ata5.00: limiting speed to UDMA/100:PIO4
[ 2309.921122] ata5: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xe frozen
[ 2309.921129] ata5: irq_stat 0x00400040, connection status changed
[ 2309.921136] ata5: SError: { PHYRdyChg DevExch }
[ 2309.921146] ata5: hard resetting link
[ 2311.510072] ata5: SATA link down (SStatus 0 SControl 310)
[ 2312.664288] ata5: hard resetting link
[ 2312.983216] ata5: SATA link down (SStatus 0 SControl 310)
[ 2313.023080] ata5: hard resetting link
[ 2317.613196] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[ 2317.624127] ata5.00: configured for UDMA/100
[ 2317.624134] ata5: EH complete
[ 2319.963041] ata5: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xe frozen
[ 2319.963046] ata5: irq_stat 0x00400040, connection status changed
[ 2319.963049] ata5: SError: { PHYRdyChg DevExch }
[ 2319.963053] ata5: hard resetting link
[ 2324.106731] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[ 2324.120928] ata5.00: configured for UDMA/100
[ 2324.120936] ata5: EH complete
[ 2327.476226] ata5.00: limiting speed to UDMA/33:PIO4
[ 2327.476239] ata5: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xe frozen
[ 2327.476247] ata5: irq_stat 0x00400040, connection status changed
[ 2327.476253] ata5: SError: { PHYRdyChg DevExch }
[ 2327.476263] ata5: hard resetting link
[ 2331.616572] ata5: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[ 2331.631075] ata5.00: configured for UDMA/33
[ 2331.631088] ata5: EH complete
[ 2345.214552] ata5: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xe frozen
[ 2345.214564] ata5: irq_stat 0x00400040, connection status changed
[ 2345.214571] ata5: SError: { PHYRdyChg DevExch }
[ 2345.214581] ata5: hard resetting link
[ 2345.933337] ata5: SATA link down (SStatus 0 SControl 310)
[ 2350.933463] ata5: hard resetting link
[ 2351.253332] ata5: SATA link down (SStatus 0 SControl 310)
[ 2356.253320] ata5: hard resetting link
[ 2356.573402] ata5: SATA link down (SStatus 0 SControl 310)
[ 2356.573415] ata5.00: disabled
[ 2356.573430] ata5: EH complete
[ 2356.573482] ata5.00: detaching (SCSI 4:0:0:0)
[ 2356.575939] sd 4:0:0:0: [sdb] Stopping disk
[ 2356.575961] sd 4:0:0:0: [sdb] Start/Stop Unit failed: Result: hostbyte=0x04 driverbyte=0x00
[ 2356.680201] BTRFS error (device sdb1): bdev /dev/sdb1 errs: wr 0, rd 1, flush 0, corrupt 0, gen 0
[ 2356.680355] BTRFS error (device sdb1): bdev /dev/sdb1 errs: wr 0, rd 2, flush 0, corrupt 0, gen 0
[ 2356.680367] BTRFS error (device sdb1): error reading free space cache
[ 2356.680370] BTRFS warning (device sdb1): failed to load free space cache for block group 29360128, rebuilding it now
[ 2356.680413] BTRFS error (device sdb1): bdev /dev/sdb1 errs: wr 0, rd 3, flush 0, corrupt 0, gen 0
[ 2356.680453] BTRFS error (device sdb1): bdev /dev/sdb1 errs: wr 0, rd 4, flush 0, corrupt 0, gen 0
[ 2356.680514] BTRFS error (device sdb1): bdev /dev/sdb1 errs: wr 0, rd 5, flush 0, corrupt 0, gen 0
[ 2356.680531] BTRFS error (device sdb1): bdev /dev/sdb1 errs: wr 0, rd 6, flush 0, corrupt 0, gen 0
[ 2356.680544] BTRFS error (device sdb1): bdev /dev/sdb1 errs: wr 0, rd 7, flush 0, corrupt 0, gen 0
[ 2356.680559] BTRFS error (device sdb1): bdev /dev/sdb1 errs: wr 0, rd 8, flush 0, corrupt 0, gen 0
[ 2356.680569] BTRFS error (device sdb1): error reading free space cache
[ 2356.680572] BTRFS warning (device sdb1): failed to load free space cache for block group 60158902272, rebuilding it now
[ 2356.680611] BTRFS error (device sdb1): bdev /dev/sdb1 errs: wr 0, rd 9, flush 0, corrupt 0, gen 0
[ 2356.680648] BTRFS error (device sdb1): bdev /dev/sdb1 errs: wr 0, rd 10, flush 0, corrupt 0, gen 0
[ 2356.680746] BTRFS error (device sdb1): error reading free space cache
[ 2356.680749] BTRFS warning (device sdb1): failed to load free space cache for block group 69285707776, rebuilding it now
[ 2356.680932] BTRFS error (device sdb1): error reading free space cache
[ 2356.680935] BTRFS warning (device sdb1): failed to load free space cache for block group 71970062336, rebuilding it now
[ 2356.681123] BTRFS error (device sdb1): error reading free space cache
[ 2356.681126] BTRFS warning (device sdb1): failed to load free space cache for block group 84318093312, rebuilding it now
[ 2356.681317] BTRFS error (device sdb1): error reading free space cache
[ 2356.681319] BTRFS warning (device sdb1): failed to load free space cache for block group 104182317056, rebuilding it now
[ 2356.681514] BTRFS error (device sdb1): error reading free space cache
[ 2356.681516] BTRFS warning (device sdb1): failed to load free space cache for block group 111698509824, rebuilding it now
[ 2356.681728] BTRFS error (device sdb1): error reading free space cache
[ 2356.681731] BTRFS warning (device sdb1): failed to load free space cache for block group 119751573504, rebuilding it now
[ 2356.681923] BTRFS error (device sdb1): error reading free space cache
[ 2356.681925] BTRFS warning (device sdb1): failed to load free space cache for block group 143910764544, rebuilding it now
[ 2356.682127] BTRFS error (device sdb1): error reading free space cache
[ 2356.682129] BTRFS warning (device sdb1): failed to load free space cache for block group 153574440960, rebuilding it now
[ 2356.682310] BTRFS error (device sdb1): error reading free space cache
[ 2356.682313] BTRFS warning (device sdb1): failed to load free space cache for block group 158406279168, rebuilding it now
[ 2356.682497] BTRFS error (device sdb1): error reading free space cache
[ 2356.682499] BTRFS warning (device sdb1): failed to load free space cache for block group 178807373824, rebuilding it now
[ 2356.682663] BTRFS error (device sdb1): error reading free space cache
[ 2356.682666] BTRFS warning (device sdb1): failed to load free space cache for block group 183639212032, rebuilding it now
[ 2356.682867] BTRFS error (device sdb1): error reading free space cache
[ 2356.682870] BTRFS warning (device sdb1): failed to load free space cache for block group 199745339392, rebuilding it now
[ 2356.683039] ------------[ cut here ]------------
[ 2356.683079] WARNING: CPU: 0 PID: 1525 at fs/btrfs/extent-tree.c:7451 find_free_extent+0xdf6/0xe60 [btrfs]()
[ 2356.683081] BTRFS: Transaction aborted (error -5)
[ 2356.683083] Modules linked in: bnep ext4 mbcache jbd2 uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 btusb videobuf2_core btrtl v4l2_common btbcm btintel bluetooth crc16 videodev hid_generic media joydev dell_rbtn dell_wmi iTCO_wdt dell_laptop mousedev snd_hda_codec_idt snd_hda_codec_generic gpio_ich iTCO_vendor_support sparse_keymap coretemp ppdev dcdbas input_leds kvm_intel evdev psmouse kvm snd_hda_intel dell_smm_hwmon mac_hid snd_hda_codec irqbypass serio_raw pcspkr snd_hda_core i2c_i801 snd_hwdep wl(PO) snd_pcm e1000e lpc_ich nvidia(PO) snd_timer cfg80211 snd ptp drm parport_pc wmi rfkill intel_agp pps_core soundcore parport button battery thermal acpi_als kfifo_buf industrialio intel_gtt acpi_cpufreq tpm_tis tpm video ac processor shpchp sch_fq_codel pci_stub vboxpci(O) vboxdrv(O)
[ 2356.683201]  ip_tables x_tables crc32c_generic btrfs xor raid6_pq sr_mod cdrom sd_mod usbhid hid atkbd libps2 ahci libahci firewire_ohci firewire_core crc_itu_t sdhci_pci sdhci led_class mmc_core libata scsi_mod ehci_pci uhci_hcd ehci_hcd usbcore usb_common i8042 serio
[ 2356.683227] CPU: 0 PID: 1525 Comm: umount Tainted: P           O    4.4.1-2-ARCH #1
[ 2356.683229] Hardware name: Dell Inc. Precision M2400                 /0HT029, BIOS A23 08/19/2010
[ 2356.683231]  0000000000000000 0000000014251078 ffff880006c23930 ffffffff812c7f39
[ 2356.683234]  ffff880006c23978 ffff880006c23968 ffffffff810765b2 0000000000000000
[ 2356.683236]  0000000000000001 ffff8800da9985a0 00000000fffffffb ffff88000b908bf8
[ 2356.683239] Call Trace:
[ 2356.683246]  [<ffffffff812c7f39>] dump_stack+0x4b/0x72
[ 2356.683251]  [<ffffffff810765b2>] warn_slowpath_common+0x82/0xc0
[ 2356.683253]  [<ffffffff8107664c>] warn_slowpath_fmt+0x5c/0x80
[ 2356.683265]  [<ffffffffa026c33f>] ? __btrfs_alloc_chunk+0x70f/0x910 [btrfs]
[ 2356.683273]  [<ffffffffa0231c46>] find_free_extent+0xdf6/0xe60 [btrfs]
[ 2356.683281]  [<ffffffffa0231d3b>] btrfs_reserve_extent+0x8b/0x170 [btrfs]
[ 2356.683289]  [<ffffffffa0231f29>] btrfs_alloc_tree_block+0x109/0x500 [btrfs]
[ 2356.683297]  [<ffffffffa0219621>] __btrfs_cow_block+0x141/0x590 [btrfs]
[ 2356.683304]  [<ffffffffa0219c02>] btrfs_cow_block+0x112/0x1d0 [btrfs]
[ 2356.683310]  [<ffffffffa02bc364>] commit_cowonly_roots+0x5b/0x2c2 [btrfs]
[ 2356.683318]  [<ffffffffa022eb4b>] ? btrfs_run_delayed_refs+0x1fb/0x290 [btrfs]
[ 2356.683329]  [<ffffffffa02ab133>] ? btrfs_qgroup_account_extents+0x83/0x130 [btrfs]
[ 2356.683338]  [<ffffffffa0243d02>] btrfs_commit_transaction+0x512/0xb20 [btrfs]
[ 2356.683348]  [<ffffffffa02443ae>] ? start_transaction+0x9e/0x4c0 [btrfs]
[ 2356.683357]  [<ffffffffa023d79f>] btrfs_commit_super+0x8f/0xa0 [btrfs]
[ 2356.683366]  [<ffffffffa023f239>] close_ctree+0x2a9/0x350 [btrfs]
[ 2356.683373]  [<ffffffffa0212fe9>] btrfs_put_super+0x19/0x20 [btrfs]
[ 2356.683376]  [<ffffffff811e103a>] generic_shutdown_super+0x6a/0xf0
[ 2356.683377]  [<ffffffff811e1352>] kill_anon_super+0x12/0x20
[ 2356.683384]  [<ffffffffa02128e8>] btrfs_kill_super+0x18/0x120 [btrfs]
[ 2356.683386]  [<ffffffff811e14f3>] deactivate_locked_super+0x43/0x70
[ 2356.683388]  [<ffffffff811e210c>] deactivate_super+0x5c/0x60
[ 2356.683391]  [<ffffffff811fd4ef>] cleanup_mnt+0x3f/0x90
[ 2356.683394]  [<ffffffff811fd582>] __cleanup_mnt+0x12/0x20
[ 2356.683396]  [<ffffffff810922e3>] task_work_run+0x73/0x90
[ 2356.683399]  [<ffffffff8100369a>] exit_to_usermode_loop+0xba/0xc0
[ 2356.683401]  [<ffffffff81003b9e>] syscall_return_slowpath+0x4e/0x60
[ 2356.683404]  [<ffffffff81591c8c>] int_ret_from_sys_call+0x25/0x8f
[ 2356.683405] ---[ end trace 6020b75ba7c696b8 ]---
[ 2356.683408] BTRFS warning (device sdb1): find_free_extent:7451: Aborting unused transaction(IO failure).
[ 2356.683412] BTRFS warning (device sdb1): Skipping commit of aborted transaction.
[ 2356.683414] BTRFS warning (device sdb1): cleanup_transaction:1746: Aborting unused transaction(IO failure).
[ 2356.683415] BTRFS info (device sdb1): delayed_refs has NO entry
[ 2356.683419] BTRFS error (device sdb1): commit super ret -5
[ 2362.946500] ata5: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen
[ 2362.946508] ata5: irq_stat 0x00000040, connection status changed
[ 2362.946511] ata5: SError: { CommWake DevExch }
[ 2362.946518] ata5: hard resetting link
[ 2367.733473] ata5: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 2367.743748] ata5.00: ATA-9: WDC WD10EZEX-22BN5A0, 01.01A01, max UDMA/133
[ 2367.743754] ata5.00: 1953525168 sectors, multi 0: LBA48 NCQ (depth 31/32), AA
[ 2367.744513] ata5.00: configured for UDMA/133
[ 2367.744526] ata5: EH complete
[ 2367.748255] scsi 4:0:0:0: Direct-Access     ATA      WDC WD10EZEX-22B 1A01 PQ: 0 ANSI: 5
[ 2367.748962] sd 4:0:0:0: [sdb] 1953525168 512-byte logical blocks: (1.00 TB/931 GiB)
[ 2367.748972] sd 4:0:0:0: [sdb] 4096-byte physical blocks
[ 2367.749113] sd 4:0:0:0: [sdb] Write Protect is off
[ 2367.749123] sd 4:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[ 2367.749188] sd 4:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 2367.810270]  sdb: sdb1
[ 2367.810667] sd 4:0:0:0: [sdb] Attached SCSI removable disk
[ 2383.375826] BTRFS info (device sdb1): disk space caching is enabled
[ 2383.375830] BTRFS: has skinny extents
[ 2897.986685] ata1.00: exception Emask 0x0 SAct 0x71000001 SErr 0x0 action 0x0
[ 2897.986692] ata1.00: irq_stat 0x40000008
[ 2897.986696] ata1.00: failed command: READ FPDMA QUEUED
[ 2897.986704] ata1.00: cmd 60/38:e0:68:52:ec/00:00:05:00:00/40 tag 28 ncq 28672 in
                        res 41/40:38:98:52:ec/00:00:05:00:00/00 Emask 0x409 (media error) <F>
[ 2897.986707] ata1.00: status: { DRDY ERR }
[ 2897.986710] ata1.00: error: { UNC }
[ 2898.210840] ata1.00: configured for UDMA/133
[ 2898.210877] sd 0:0:0:0: [sda] tag#28 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
[ 2898.210883] sd 0:0:0:0: [sda] tag#28 Sense Key : 0x3 [current] [descriptor] 
[ 2898.210887] sd 0:0:0:0: [sda] tag#28 ASC=0x11 ASCQ=0x4 
[ 2898.210892] sd 0:0:0:0: [sda] tag#28 CDB: opcode=0x28 28 00 05 ec 52 68 00 00 38 00
[ 2898.210896] blk_update_request: I/O error, dev sda, sector 99373720
[ 2898.210900] btrfs_dev_stat_print_on_error: 102 callbacks suppressed
[ 2898.210905] BTRFS error (device sda3): bdev /dev/sda3 errs: wr 0, rd 19, flush 0, corrupt 0, gen 0
[ 2898.210931] ata1: EH complete
[ 2902.959951] ata1.00: exception Emask 0x0 SAct 0x400000 SErr 0x0 action 0x0
[ 2902.959958] ata1.00: irq_stat 0x40000008
[ 2902.959962] ata1.00: failed command: READ FPDMA QUEUED
[ 2902.959970] ata1.00: cmd 60/08:b0:98:52:ec/00:00:05:00:00/40 tag 22 ncq 4096 in
                        res 41/40:08:98:52:ec/00:00:05:00:00/00 Emask 0x409 (media error) <F>
[ 2902.959973] ata1.00: status: { DRDY ERR }
[ 2902.959976] ata1.00: error: { UNC }
[ 2903.082344] ata1.00: configured for UDMA/133
[ 2903.082362] sd 0:0:0:0: [sda] tag#22 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
[ 2903.082366] sd 0:0:0:0: [sda] tag#22 Sense Key : 0x3 [current] [descriptor] 
[ 2903.082368] sd 0:0:0:0: [sda] tag#22 ASC=0x11 ASCQ=0x4 
[ 2903.082371] sd 0:0:0:0: [sda] tag#22 CDB: opcode=0x28 28 00 05 ec 52 98 00 00 08 00
[ 2903.082373] blk_update_request: I/O error, dev sda, sector 99373720
[ 2903.082376] BTRFS error (device sda3): bdev /dev/sda3 errs: wr 0, rd 20, flush 0, corrupt 0, gen 0
[ 2903.082389] ata1: EH complete
  • Have you checked dmesg for disk error messages? – user1686 Feb 7 '16 at 11:57
  • @grawity, I have added some dmesg output. – Caleb Reister Feb 7 '16 at 22:52
  • I believe that pretty much translates to "your disk is dead"... – user1686 Feb 8 '16 at 6:50
  • You mean my laptop's internal disk? I got WD drive in December, but my internal drive is fairly old. As noted earlier, the strange thing is that the other subvolumes I back up (everything not in my home folder) give me no errors at all. – Caleb Reister Feb 8 '16 at 7:15
  • That's not unusual at all. HDDs don't usually fail completely – you start with just a few bad sectors and they spread over time. (You don't even notice the first few because the drive has spare areas to reallocate them, unless you habitually check SMART counters.) – user1686 Feb 8 '16 at 15:38
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It appears I got it working. I reverted to an older version of my @home subvolume and copied back some of the changes that had occurred since the last backup. When I tried to copy my Firefox profile, it was not completely transferred, so I just updated the older version.

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