Hello,

i have btrfs on my root partition (openSUSE Tumbleweed) for a year and half, 
but recently i've ran into the following issue - after an attempt to restore a 
snapper snapshot the system stopped booting, claiming:

> BTRFS: error (device sda3) in __btrfs_free_extent:6944: errno=-2 no such entry
> BTRFS: error (device sda3) in btrfs_run_delayed_refs:2956: errno=-2 no such 
> entry

after some searching i ran "btrfs check --repair" on the partition. it fixed 
some errors and the system would start again. but after few days the error 
returned, same as before. so i decided to seek help of someone more 
knowledgeable than me.

system and partition info:
Linux Niddhog 4.10.8-1-default #1 SMP PREEMPT Fri Mar 31 17:16:00 UTC 2017 
(ea9dcd4) x86_64 x86_64 x86_64 GNU/Linux
btrfs-progs v4.9+20170104
Label: none uuid: 08fb0009-baab-44d4-9a3b-1131d9a17719
Total devices 1 FS bytes used 24.05GiB
devid 1 size 40.00GiB used 28.07GiB path /dev/sda3

Data, single: total=24.01GiB, used=22.62GiB
System, DUP: total=32.00MiB, used=16.00KiB
Metadata, DUP: total=2.00GiB, used=1.43GiB
GlobalReserve, single: total=512.00MiB, used=0.00B

attaching check --repair output.
dmesg output: https://pastebin.com/DRrNbe4H

thank you,
Tadeáš Berkman

Attachment: repair.log
Description: Binary data

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