btrfs forced readonly | error in btrfs_run_delayed_refs:2907: errno=-17 Object already exists

btrfs forced readonly | error in btrfs_run_delayed_refs:2907: errno=-17 Object already exists

[Rachel Powers]

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I've tried using -o usebackuproot but the error persists as soon as I
try to modify the filesystem

a btrfs scrub fails almost immediately, errors are in the dmesg log
a btrfs-check (no --repair) also fails almost imediatly

Opening filesystem to check...
Checking filesystem on /dev/sda4
UUID: 31b1c345-9fff-4172-b979-fdb670d89349
[1/7] checking root items
parent transid verify failed on 37470208 wanted 6149 found 6150
parent transid verify failed on 37470208 wanted 6149 found 6150
parent transid verify failed on 37470208 wanted 6149 found 6150
Ignoring transid failure
ERROR: child eb corrupted: parent bytenr=31391744 item=5 parent
level=1 child level=1
ERROR: failed to repair root items: Input/output error

$ uname -a

Linux 5.2.11-arch1-1-ARCH #1 SMP PREEMPT Thu Aug 29 08:09:36 UTC 2019
x86_64 GNU/Linux

$ btrfs --version

btrfs-progs v5.2.1

$ btrfs fi show

Label: 'Arch Linux' uuid: 5495bf63-5357-453b-a8ff-d39c32fe48b0
Total devices 1 FS bytes used 21.12GiB
devid 1 size 200.00GiB used 26.02GiB path /dev/sda2

Label: 'Arch Home' uuid: 4ec029f4-3394-4408-baa3-6160956e1ef5
Total devices 1 FS bytes used 11.32GiB
devid 1 size 100.00GiB used 14.02GiB path /dev/sda3

Label: 'storage' uuid: 31b1c345-9fff-4172-b979-fdb670d89349
Total devices 1 FS bytes used 148.98GiB
devid 1 size 3.34TiB used 153.07GiB path /dev/sda4

$ btrfs fi df /mnt/storage

Data, single: total=149.01GiB, used=148.47GiB
System, DUP: total=32.00MiB, used=48.00KiB
Metadata, DUP: total=2.00GiB, used=523.53MiB
GlobalReserve, single: total=215.11MiB, used=0.00B


Any help that could be provided in repairing this file system would be 
great.
Also it would be great to know how this might of happened so I can
avoid it in the future.

None of the data is exactly precious, in fact most of it is backed up
elsewhere either in dropbox or on an external drive. but I'd like to
avoid needing to restore it as my internet speed is atrocious.



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