btrfs_check

Opening filesystem to check...
Checking filesystem on /dev/mapper/old
UUID: 488f733d-1dfd-4a0f-ab2f-ba690e095fe4
[1/7] checking root items
[2/7] checking extents
data backref 40762777600 root 256 owner 525787 offset 0 num_refs 0 not found in extent tree
incorrect local backref count on 40762777600 root 256 owner 525787 offset 0 found 1 wanted 0 back 0x55ed05f57b90
incorrect local backref count on 40762777600 root 4352 owner 525787 offset 0 found 0 wanted 1 back 0x55ed01301f80
backref disk bytenr does not match extent record, bytenr=40762777600, ref bytenr=0
backpointer mismatch on [40762777600 4096]
ERROR: errors found in extent allocation tree or chunk allocation
[3/7] checking free space cache
[4/7] checking fs roots
[5/7] checking only csums items (without verifying data)
[6/7] checking root refs
[7/7] checking quota groups skipped (not enabled on this FS)
found 87799443456 bytes used, error(s) found
total csum bytes: 84696784
total tree bytes: 954220544
total fs tree bytes: 806535168
total extent tree bytes: 47710208
btree space waste bytes: 150766636
file data blocks allocated: 87780622336
 referenced 94255783936