Hi Chris,
Thanks for replying.
On Fri, 29 Mar 2019 at 13:27, Chris Murphy <li...@colorremedies.com> wrote:
...
> Seem in conflict. I don't really understand how the kernel complains
> about a bad super and yet user space tools say they're all OK. What
> happens if you try:
>
> # mount -o ro,nologreplay,usebackuproot
I got essentially the same results...
% mount -o ro,nologreplay,usebackuproot /dev/sda1
mount: /data: can't read superblock on /dev/sda1.
and from dmesg...
[73194.642197] BTRFS info (device sda1): use lzo compression, level 0
[73194.642206] BTRFS info (device sda1): disabling log replay at mount time
[73194.642210] BTRFS info (device sda1): trying to use backup root at mount time
[73194.642211] BTRFS info (device sda1): disk space caching is enabled
[73194.642213] BTRFS info (device sda1): has skinny extents
[73194.726290] BTRFS info (device sda1): bdev /dev/sda1 errs: wr 0, rd
0, flush 0, corrupt 1, gen 0
[73194.726297] BTRFS info (device sda1): bdev /dev/sdc1 errs: wr 0, rd
0, flush 0, corrupt 4, gen 0
[73194.753315] BTRFS error (device sda1): parent transid verify failed
on 628168376320 wanted 37601 found 37712
[73194.779836] BTRFS error (device sda1): parent transid verify failed
on 628168376320 wanted 37601 found 37712
> If that doesn't work, including kernel messages again, and also
> include output from:
>
> # btrfs insp dump-s -fa /dev/sda1
> # btrfs insp dump-s -fa /dev/sdb1
I've attached the output from these commands (note that since I added
an extra disk, what was sdb1 has now become sdc1).
I'll have a go at the newer kernel approach you suggest and see what
happens there.
Regards,
Glenn
> >
> > and dmesg says:
> >
> > [15944.017629] BTRFS info (device sda1): disk space caching is enabled
> > [15944.017632] BTRFS info (device sda1): has skinny extents
> > [15944.024480] BTRFS info (device sda1): bdev /dev/sda1 errs: wr 0, rd
> > 0, flush 0, corrupt 1, gen 0
> > [15944.024487] BTRFS info (device sda1): bdev /dev/sdb1 errs: wr 0, rd
> > 0, flush 0, corrupt 4, gen 0
> > [15944.029292] BTRFS error (device sda1): parent transid verify failed
> > on 628168376320 wanted 37601 found 37700
> > [15944.029466] BTRFS error (device sda1): parent transid verify failed
> > on 628168376320 wanted 37601 found 37700
>
> That's usually bad.
>
>
> > Other system information is:
> > % uname -a
> > Linux izen 4.18.0-16-generic #17-Ubuntu SMP Fri Feb 8 00:06:57 UTC
> > 2019 x86_64 x86_64 x86_64 GNU/Linux
>
> It looks like extent tree corruption so I don't think it'll help to
> use a newer kernel; but I'd try it anyway in the meantime until a
> developer gets around to responding. Distro specific kernels tend to
> be supported by that distribution where upstream lists tend to support
> mainline. So I suggest 5.0.4, or 4.19.32, or you can be brave and
> download this, image it to a USB stick (dd if=file of=/dev/ bs=1M
> oflag=direct) which of course will erase everything on the stick.
>
> https://kojipkgs.fedoraproject.org/compose/rawhide/Fedora-Rawhide-20190327.n.0/compose/Everything/x86_64/iso/Fedora-Everything-netinst-x86_64-Rawhide-20190327.n.0.iso
>
> That might have 5.1rc2 on it, or something in between rc1 and rc2.
> You're still going to try and mount it read-only per above command, so
> even if it blows up it's not going to make this worse.
>
>
> > % btrfs check /dev/sda1
> > Checking filesystem on /dev/sda1
> > UUID: d5e50511-3e31-4de6-ba37-c5841895be9f
> > checking extents
> > parent transid verify failed on 628168343552 wanted 28163 found 37700
> > parent transid verify failed on 628168343552 wanted 28163 found 37700
> > parent transid verify failed on 628168343552 wanted 28163 found 37700
> > parent transid verify failed on 628168343552 wanted 28163 found 37700
>
> The transid's are really far apart, definitely something went really
> wrong. It could be hardware or both hardware and btrfs bug. That it
> affected *both* copies is a little weird unless it's memory corruption
> related, and then a lot of things can go wrong.
>
>
> >
> > Where do I go from here?
>
> If it can't be mounted, then the only chance is `btrfs-find-tree` and
> `btrfs restore` to try and scrape out whatever data you need that
> isn't already backed up. The priority before trying to repair it, is
> to get anything important off because trying to repair it has a good
> chance of permanent data loss. Definitely the latest tools are
> recommended for repair, kernel doesn't matter so much.
>
>
> --
> Chris Murphy
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dev_item.fsid d5e50511-3e31-4de6-ba37-c5841895be9f [match]
dev_item.type 0
dev_item.total_bytes 2000397864960
dev_item.bytes_used 877314179072
dev_item.io_align 4096
dev_item.io_width 4096
dev_item.sector_size 4096
dev_item.devid 2
dev_item.dev_group 0
dev_item.seek_speed 0
dev_item.bandwidth 0
dev_item.generation 0
sys_chunk_array[2048]:
item 0 key (FIRST_CHUNK_TREE CHUNK_ITEM 1085582344192)
length 33554432 owner 2 stripe_len 65536 type SYSTEM|RAID1
io_align 65536 io_width 65536 sector_size 4096
num_stripes 2 sub_stripes 1
stripe 0 devid 2 offset 543314411520
dev_uuid d9c56d7a-21a1-4197-a701-5493392e1ae1
stripe 1 devid 1 offset 2185232384
dev_uuid a28b0f34-f14d-492b-995b-2dd8a78ec9bb
item 1 key (FIRST_CHUNK_TREE CHUNK_ITEM 1470082580480)
length 33554432 owner 2 stripe_len 65536 type SYSTEM
io_align 65536 io_width 65536 sector_size 4096
num_stripes 1 sub_stripes 1
stripe 0 devid 2 offset 817219239936
dev_uuid d9c56d7a-21a1-4197-a701-5493392e1ae1
backup_roots[4]:
backup 0:
backup_tree_root: 628642381824 gen: 37697 level: 1
backup_chunk_root: 1085582344192 gen: 37696 level: 1
backup_extent_root: 628642529280 gen: 37697 level: 2
backup_fs_root: 628635549696 gen: 37696 level: 2
backup_dev_root: 628642152448 gen: 37696 level: 1
backup_csum_root: 628645314560 gen: 37697 level: 2
backup_total_bytes: 4000795660288
backup_bytes_used: 891681054720
backup_num_devices: 2
backup 1:
backup_tree_root: 628628897792 gen: 37694 level: 1
backup_chunk_root: 1085582409728 gen: 37616 level: 1
backup_extent_root: 628624818176 gen: 37694 level: 2
backup_fs_root: 628623933440 gen: 37694 level: 2
backup_dev_root: 628452327424 gen: 37616 level: 1
backup_csum_root: 628629946368 gen: 37694 level: 2
backup_total_bytes: 4000795663872
backup_bytes_used: 891681054720
backup_num_devices: 2
backup 2:
backup_tree_root: 628633518080 gen: 37695 level: 1
backup_chunk_root: 1085582409728 gen: 37616 level: 1
backup_extent_root: 628633534464 gen: 37695 level: 2
backup_fs_root: 628623933440 gen: 37694 level: 2
backup_dev_root: 628452327424 gen: 37616 level: 1
backup_csum_root: 628634140672 gen: 37695 level: 2
backup_total_bytes: 4000795663872
backup_bytes_used: 891681054720
backup_num_devices: 2
backup 3:
backup_tree_root: 628632535040 gen: 37696 level: 1
backup_chunk_root: 1085582344192 gen: 37696 level: 1
backup_extent_root: 628624818176 gen: 37696 level: 2
backup_fs_root: 628635549696 gen: 37696 level: 2
backup_dev_root: 628642152448 gen: 37696 level: 1
backup_csum_root: 628632649728 gen: 37696 level: 2
backup_total_bytes: 4000795660288
backup_bytes_used: 891681054720
backup_num_devices: 2
superblock: bytenr=274877906944, device=/dev/sdc1
---------------------------------------------------------
csum_type 0 (crc32c)
csum_size 4
csum 0xe1983967 [match]
bytenr 274877906944
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid d5e50511-3e31-4de6-ba37-c5841895be9f
metadata_uuid d5e50511-3e31-4de6-ba37-c5841895be9f
label data
generation 37713
root 628168458240
sys_array_size 226
chunk_root_generation 37696
root_level 1
chunk_root 1085582344192
chunk_root_level 1
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 4000795660288
bytes_used 891682791424
sectorsize 4096
nodesize 16384
leafsize (deprecated) 16384
stripesize 4096
root_dir 6
num_devices 2
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x169
( MIXED_BACKREF |
COMPRESS_LZO |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA )
cache_generation 37697
uuid_tree_generation 37697
dev_item.uuid d9c56d7a-21a1-4197-a701-5493392e1ae1
dev_item.fsid d5e50511-3e31-4de6-ba37-c5841895be9f [match]
dev_item.type 0
dev_item.total_bytes 2000397864960
dev_item.bytes_used 877314179072
dev_item.io_align 4096
dev_item.io_width 4096
dev_item.sector_size 4096
dev_item.devid 2
dev_item.dev_group 0
dev_item.seek_speed 0
dev_item.bandwidth 0
dev_item.generation 0
sys_chunk_array[2048]:
item 0 key (FIRST_CHUNK_TREE CHUNK_ITEM 1085582344192)
length 33554432 owner 2 stripe_len 65536 type SYSTEM|RAID1
io_align 65536 io_width 65536 sector_size 4096
num_stripes 2 sub_stripes 1
stripe 0 devid 2 offset 543314411520
dev_uuid d9c56d7a-21a1-4197-a701-5493392e1ae1
stripe 1 devid 1 offset 2185232384
dev_uuid a28b0f34-f14d-492b-995b-2dd8a78ec9bb
item 1 key (FIRST_CHUNK_TREE CHUNK_ITEM 1470082580480)
length 33554432 owner 2 stripe_len 65536 type SYSTEM
io_align 65536 io_width 65536 sector_size 4096
num_stripes 1 sub_stripes 1
stripe 0 devid 2 offset 817219239936
dev_uuid d9c56d7a-21a1-4197-a701-5493392e1ae1
backup_roots[4]:
backup 0:
backup_tree_root: 628642381824 gen: 37697 level: 1
backup_chunk_root: 1085582344192 gen: 37696 level: 1
backup_extent_root: 628642529280 gen: 37697 level: 2
backup_fs_root: 628635549696 gen: 37696 level: 2
backup_dev_root: 628642152448 gen: 37696 level: 1
backup_csum_root: 628645314560 gen: 37697 level: 2
backup_total_bytes: 4000795660288
backup_bytes_used: 891681054720
backup_num_devices: 2
backup 1:
backup_tree_root: 628628897792 gen: 37694 level: 1
backup_chunk_root: 1085582409728 gen: 37616 level: 1
backup_extent_root: 628624818176 gen: 37694 level: 2
backup_fs_root: 628623933440 gen: 37694 level: 2
backup_dev_root: 628452327424 gen: 37616 level: 1
backup_csum_root: 628629946368 gen: 37694 level: 2
backup_total_bytes: 4000795663872
backup_bytes_used: 891681054720
backup_num_devices: 2
backup 2:
backup_tree_root: 628633518080 gen: 37695 level: 1
backup_chunk_root: 1085582409728 gen: 37616 level: 1
backup_extent_root: 628633534464 gen: 37695 level: 2
backup_fs_root: 628623933440 gen: 37694 level: 2
backup_dev_root: 628452327424 gen: 37616 level: 1
backup_csum_root: 628634140672 gen: 37695 level: 2
backup_total_bytes: 4000795663872
backup_bytes_used: 891681054720
backup_num_devices: 2
backup 3:
backup_tree_root: 628632535040 gen: 37696 level: 1
backup_chunk_root: 1085582344192 gen: 37696 level: 1
backup_extent_root: 628624818176 gen: 37696 level: 2
backup_fs_root: 628635549696 gen: 37696 level: 2
backup_dev_root: 628642152448 gen: 37696 level: 1
backup_csum_root: 628632649728 gen: 37696 level: 2
backup_total_bytes: 4000795660288
backup_bytes_used: 891681054720
backup_num_devices: 2
