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# btrfsck /dev/sdb1
Checking filesystem on /dev/sdb1
UUID: 787e3bc1-7583-4bd8-a52e-e57fd7fc9243
checking extents
ref mismatch on [20971520 16384] extent item 0, found 1
Backref 20971520 parent 3 root 3 not found in extent tree
backpointer mismatch on [20971520 16384]
ref mismatch on [20987904 16384] extent item 0, found 1
Backref 20987904 parent 3 root 3 not found in extent tree
backpointer mismatch on [20987904 16384]
owner ref check failed [20987904 16384]
ref mismatch on [21004288 16384] extent item 0, found 1
Backref 21004288 parent 3 root 3 not found in extent tree
backpointer mismatch on [21004288 16384]
owner ref check failed [21004288 16384]
ref mismatch on [21053440 16384] extent item 0, found 1
Backref 21053440 parent 3 root 3 not found in extent tree
backpointer mismatch on [21053440 16384]
owner ref check failed [21053440 16384]
ref mismatch on [21086208 16384] extent item 0, found 1
Backref 21086208 parent 3 root 3 not found in extent tree
backpointer mismatch on [21086208 16384]
owner ref check failed [21086208 16384]
ref mismatch on [29392896 16384] extent item 0, found 1
Backref 29392896 parent 1 root 1 not found in extent tree
backpointer mismatch on [29392896 16384]
ref mismatch on [29409280 16384] extent item 0, found 1
Backref 29409280 parent 2 root 2 not found in extent tree
backpointer mismatch on [29409280 16384]
ref mismatch on [29442048 16384] extent item 0, found 1
Backref 29442048 parent 2 root 2 not found in extent tree
backpointer mismatch on [29442048 16384]
owner ref check failed [29442048 16384]
ref mismatch on [29458432 16384] extent item 0, found 1
Backref 29458432 parent 9 root 9 not found in extent tree
backpointer mismatch on [29458432 16384]
owner ref check failed [29458432 16384]
ref mismatch on [29474816 16384] extent item 0, found 1
Backref 29474816 parent 1 root 1 not found in extent tree
backpointer mismatch on [29474816 16384]
owner ref check failed [29474816 16384]
ref mismatch on [29507584 16384] extent item 0, found 1
Backref 29507584 parent 2 root 2 not found in extent tree
backpointer mismatch on [29507584 16384]
owner ref check failed [29507584 16384]
ref mismatch on [29523968 16384] extent item 0, found 1
Backref 29523968 parent 1 root 1 not found in extent tree
backpointer mismatch on [29523968 16384]
owner ref check failed [29523968 16384]
ref mismatch on [29540352 16384] extent item 0, found 1
Backref 29540352 parent 18446744073709551607 root 18446744073709551607 not found in extent tree
backpointer mismatch on [29540352 16384]
owner ref check failed [29540352 16384]
ref mismatch on [30490624 16384] extent item 0, found 1
Backref 30490624 parent 5 root 5 not found in extent tree
backpointer mismatch on [30490624 16384]
owner ref check failed [30490624 16384]
ref mismatch on [30720000 16384] extent item 0, found 1
Backref 30720000 parent 4 root 4 not found in extent tree
backpointer mismatch on [30720000 16384]
owner ref check failed [30720000 16384]
ref mismatch on [31129600 16384] extent item 0, found 1
Backref 31129600 parent 1 root 1 not found in extent tree
backpointer mismatch on [31129600 16384]
owner ref check failed [31129600 16384]
ref mismatch on [31621120 16384] extent item 0, found 1
Backref 31621120 parent 1 root 1 not found in extent tree
backpointer mismatch on [31621120 16384]
owner ref check failed [31621120 16384]
ref mismatch on [31653888 16384] extent item 0, found 1
Backref 31653888 parent 1 root 1 not found in extent tree
backpointer mismatch on [31653888 16384]
owner ref check failed [31653888 16384]
ref mismatch on [31686656 16384] extent item 0, found 1
Backref 31686656 parent 1 root 1 not found in extent tree
backpointer mismatch on [31686656 16384]
owner ref check failed [31686656 16384]
ref mismatch on [31703040 16384] extent item 0, found 1
Backref 31703040 parent 1 root 1 not found in extent tree
backpointer mismatch on [31703040 16384]
owner ref check failed [31703040 16384]
ref mismatch on [31752192 16384] extent item 0, found 1
Backref 31752192 parent 1 root 1 not found in extent tree
backpointer mismatch on [31752192 16384]
owner ref check failed [31752192 16384]
ref mismatch on [31784960 16384] extent item 0, found 1
Backref 31784960 parent 1 root 1 not found in extent tree
backpointer mismatch on [31784960 16384]
owner ref check failed [31784960 16384]
ref mismatch on [32456704 16384] extent item 0, found 1
Backref 32456704 parent 1 root 1 not found in extent tree
backpointer mismatch on [32456704 16384]
owner ref check failed [32456704 16384]
ref mismatch on [34340864 16384] extent item 0, found 1
Backref 34340864 parent 7 root 7 not found in extent tree
backpointer mismatch on [34340864 16384]
owner ref check failed [34340864 16384]
ref mismatch on [47529984 16384] extent item 0, found 1
Backref 47529984 parent 1 root 1 not found in extent tree
backpointer mismatch on [47529984 16384]
owner ref check failed [47529984 16384]
Errors found in extent allocation tree or chunk allocation
checking free space cache
cache and super generation don't match, space cache will be invalidated
checking fs roots
root 5 root dir 256 not found
found 409600 bytes used err is 1
total csum bytes: 0
total tree bytes: 49152
total fs tree bytes: 0
total extent tree bytes: 16384
btree space waste bytes: 48246
file data blocks allocated: 0
 referenced 0
Btrfs v3.17