Hello/2 all
I'm using libvirt with a qcow2 image and everytime i run btrfs scrub
-H /home (subvolume where the image is), i get:
ago 15 21:58:08 kerberos kernel: BTRFS error (device sda3): bdev
/dev/sda3 errs: wr 0, rd 0, flush 0, corrupt 30, gen 0
ago 15 21:58:08 kerberos kernel: BTRFS error (device sda3): unable to
fixup (regular) error at logical 289831161856 on dev /dev/sda3
ago 15 21:58:08 kerberos kernel: BTRFS error (device sda3): bdev
/dev/sda3 errs: wr 0, rd 0, flush 0, corrupt 31, gen 0
ago 15 21:58:08 kerberos kernel: BTRFS error (device sda3): unable to
fixup (regular) error at logical 289830309888 on dev /dev/sda3
ago 15 21:58:08 kerberos kernel: BTRFS error (device sda3): bdev
/dev/sda3 errs: wr 0, rd 0, flush 0, corrupt 32, gen 0
ago 15 21:58:08 kerberos kernel: BTRFS error (device sda3): unable to
fixup (regular) error at logical 289831055360 on dev /dev/sda3
ago 15 21:58:08 kerberos kernel: BTRFS error (device sda3): bdev
/dev/sda3 errs: wr 0, rd 0, flush 0, corrupt 33, gen 0
ago 15 21:58:08 kerberos kernel: BTRFS error (device sda3): unable to
fixup (regular) error at logical 289861591040 on dev /dev/sda3
ago 15 21:58:09 kerberos kernel: BTRFS warning (device sda3): checksum
error at logical 290297204736 on dev /dev/sda3, sector 67982824, root
258, inode 968837, offset 17455849472, length 4096, links 1 (path:
groo/Fedora/Fedora.qcow2)
ago 15 21:58:09 kerberos kernel: BTRFS error (device sda3): bdev
/dev/sda3 errs: wr 0, rd 0, flush 0, corrupt 34, gen 0
ago 15 21:58:09 kerberos kernel: BTRFS error (device sda3): unable to
fixup (regular) error at logical 290297204736 on dev /dev/sda3
The thing is, as soon as i move the image to another subvolume, root
in this case, and delete it, the errors go away and scrub tells me i
have zero errors again.
Then if i AGAIN copy the file back to /home, i get the same errors.
qemu-img check tells me the qcow2 file is fine, and smart doesnt show
me anything wrong with my ssd:
root@kerberos:/home/groo# smartctl -Ai /dev/sda
smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.13.0-041300rc4-generic]
(local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Samsung based SSDs
Device Model: Samsung SSD 850 EVO M.2 500GB
Serial Number: S33DNX0H812686V
LU WWN Device Id: 5 002538 d4130d027
Firmware Version: EMT21B6Q
User Capacity: 500.107.862.016 bytes [500 GB]
Sector Size: 512 bytes logical/physical
Rotation Rate: Solid State Device
Form Factor: M.2
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-2, ATA8-ACS T13/1699-D revision 4c
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Tue Aug 15 21:59:34 2017 -03
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART Attributes Data Structure revision number: 1
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE
UPDATED WHEN_FAILED RAW_VALUE
5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail
Always - 0
9 Power_On_Hours 0x0032 099 099 000 Old_age
Always - 1739
12 Power_Cycle_Count 0x0032 099 099 000 Old_age
Always - 392
177 Wear_Leveling_Count 0x0013 099 099 000 Pre-fail
Always - 7
179 Used_Rsvd_Blk_Cnt_Tot 0x0013 100 100 010 Pre-fail
Always - 0
181 Program_Fail_Cnt_Total 0x0032 100 100 010 Old_age
Always - 0
182 Erase_Fail_Count_Total 0x0032 100 100 010 Old_age
Always - 0
183 Runtime_Bad_Block 0x0013 100 100 010 Pre-fail
Always - 0
187 Uncorrectable_Error_Cnt 0x0032 100 100 000 Old_age
Always - 0
190 Airflow_Temperature_Cel 0x0032 061 050 000 Old_age
Always - 39
195 ECC_Error_Rate 0x001a 200 200 000 Old_age
Always - 0
199 CRC_Error_Count 0x003e 100 100 000 Old_age
Always - 0
235 POR_Recovery_Count 0x0012 099 099 000 Old_age
Always - 54
241 Total_LBAs_Written 0x0032 099 099 000 Old_age
Always - 7997549567
this is the usage for /home:
root@kerberos:/home/groo# btrfs filesystem usage -T /home/
Overall:
Device size: 333.50GiB
Device allocated: 74.12GiB
Device unallocated: 259.38GiB
Device missing: 0.00B
Used: 32.70GiB
Free (estimated): 297.36GiB (min: 167.67GiB)
Data ratio: 1.00
Metadata ratio: 2.00
Global reserve: 58.12MiB (used: 0.00B)
Data Metadata System
Id Path single RAID1 RAID1 Unallocated
-- --------- -------- --------- -------- -----------
1 /dev/sda3 68.00GiB 2.00GiB 64.00MiB 129.94GiB
2 /dev/sdb7 2.00GiB 2.00GiB 64.00MiB 128.96GiB
3 /dev/sdb8 - - - 488.13MiB
-- --------- -------- --------- -------- -----------
Total 70.00GiB 2.00GiB 64.00MiB 259.38GiB
Used 32.02GiB 348.12MiB 16.00KiB
and for root subvolume:
root@kerberos:/home/groo# btrfs filesystem usage -T /
Overall:
Device size: 65.29GiB
Device allocated: 65.28GiB
Device unallocated: 12.00MiB
Device missing: 0.00B
Used: 14.94GiB
Free (estimated): 48.72GiB (min: 48.72GiB)
Data ratio: 1.00
Metadata ratio: 1.00
Global reserve: 42.20MiB (used: 0.00B)
Data Metadata System
Id Path single single single Unallocated
-- --------- -------- --------- -------- -----------
1 /dev/sda2 63.24GiB 2.01GiB 32.00MiB 12.00MiB
-- --------- -------- --------- -------- -----------
Total 63.24GiB 2.01GiB 32.00MiB 12.00MiB
Used 14.52GiB 425.16MiB 16.00KiB
i see this with both kernel 4.12 and 4.13rc4
the btrfstools are:
root@kerberos:/home/groo# btrfs version
btrfs-progs v4.12-dirty
/etc/fstab:
UUID=e31faa09-99e5-4c75-815c-629402ec92f2 / btrfs
defaults,discard,subvol=@ 0 1
# /boot was on /dev/sda1 during installation
UUID=55796428-a9b8-4f1b-9a7e-8fe3aa8d8097 /boot ext4
defaults 0 2
# /boot/efi was on /dev/sdb2 during installation
UUID=D4F8-9F87 /boot/efi vfat umask=0077 0 1
# /home was on /dev/sda3 during installation
UUID=ae9ae869-720d-4643-b673-6924d09b2fe0 /home btrfs
defaults,discard,subvol=@home 0 2
# swap was on /dev/sdb6 during installation
#UUID=fc2a432b-4c40-4fe4-9730-869a1d1911ef none swap sw
0 0
/dev/mapper/cryptswap1 none swap sw 0 0
this is reproducible every single time.
is btrfs scrub maybe getting confused with a sparse file? is it
possible to get a bad checksum with raid1 in this scenario?
any help is appreciated
| Paulo Dias
| paulo.miguel.dias@xxxxxxxxx
Tempora mutantur, nos et mutamur in illis.
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