strange corruptions found during btrfs check

[Christoph Anton Mitterer <calestyo@scientia.net>]

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Hi.

This is on a btrfs created and used with a 4.0 kernel.

Not much was done on it, apart from send/receive snapshots from another
btrfs (with -p).
Some of the older snapshots (that were used as parents before) have
been removed in the meantime).

Now a btrfs check gives this:
# btrfs check /dev/mapper/image
Checking filesystem on /dev/mapper/data-b
UUID: 250ddae1-7b37-4b22-89e9-4dc5886c810f
checking extents
ref mismatch on [468697088 16384] extent item 0, found 1
Backref 468697088 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [468697088 16384]
owner ref check failed [468697088 16384]
ref mismatch on [1002373120 16384] extent item 0, found 1
Backref 1002373120 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [1002373120 16384]
ref mismatch on [1013940224 16384] extent item 0, found 1
Backref 1013940224 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [1013940224 16384]
ref mismatch on [525281738752 16384] extent item 0, found 1
Backref 525281738752 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [525281738752 16384]
owner ref check failed [525281738752 16384]
ref mismatch on [525317095424 16384] extent item 0, found 1
Backref 525317095424 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [525317095424 16384]
owner ref check failed [525317095424 16384]
ref mismatch on [525404700672 16384] extent item 0, found 1
Backref 525404700672 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [525404700672 16384]
owner ref check failed [525404700672 16384]
ref mismatch on [525438025728 16384] extent item 0, found 1
Backref 525438025728 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [525438025728 16384]
owner ref check failed [525438025728 16384]
ref mismatch on [525554302976 16384] extent item 0, found 1
Backref 525554302976 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [525554302976 16384]
owner ref check failed [525554302976 16384]
ref mismatch on [525585235968 16384] extent item 0, found 1
Backref 525585235968 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [525585235968 16384]
owner ref check failed [525585235968 16384]
ref mismatch on [830810521600 16384] extent item 0, found 1
Backref 830810521600 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [830810521600 16384]
owner ref check failed [830810521600 16384]
ref mismatch on [830895620096 16384] extent item 0, found 1
Backref 830895620096 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [830895620096 16384]
owner ref check failed [830895620096 16384]
ref mismatch on [1038383448064 16384] extent item 0, found 1
Backref 1038383448064 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [1038383448064 16384]
owner ref check failed [1038383448064 16384]
ref mismatch on [1391733161984 16384] extent item 0, found 1
Backref 1391733161984 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [1391733161984 16384]
ref mismatch on [1392008445952 16384] extent item 0, found 1
Backref 1392008445952 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [1392008445952 16384]
ref mismatch on [1392058843136 16384] extent item 0, found 1
Backref 1392058843136 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [1392058843136 16384]
ref mismatch on [1392058925056 16384] extent item 0, found 1
Backref 1392058925056 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [1392058925056 16384]
ref mismatch on [1466625753088 16384] extent item 0, found 1
Backref 1466625753088 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [1466625753088 16384]
owner ref check failed [1466625753088 16384]
ref mismatch on [2857092792320 16384] extent item 0, found 1
Backref 2857092792320 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857092792320 16384]
owner ref check failed [2857092792320 16384]
ref mismatch on [2857095610368 16384] extent item 0, found 1
Backref 2857095610368 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857095610368 16384]
owner ref check failed [2857095610368 16384]
ref mismatch on [2857125183488 16384] extent item 0, found 1
Backref 2857125183488 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857125183488 16384]
owner ref check failed [2857125183488 16384]
ref mismatch on [2857127591936 16384] extent item 0, found 1
Backref 2857127591936 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857127591936 16384]
owner ref check failed [2857127591936 16384]
ref mismatch on [2857130393600 16384] extent item 0, found 1
Backref 2857130393600 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857130393600 16384]
owner ref check failed [2857130393600 16384]
ref mismatch on [2857138421760 16384] extent item 0, found 1
Backref 2857138421760 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857138421760 16384]
owner ref check failed [2857138421760 16384]
ref mismatch on [2857140436992 16384] extent item 0, found 1
Backref 2857140436992 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857140436992 16384]
owner ref check failed [2857140436992 16384]
ref mismatch on [2857153970176 16384] extent item 0, found 1
Backref 2857153970176 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857153970176 16384]
owner ref check failed [2857153970176 16384]
ref mismatch on [2857155837952 16384] extent item 0, found 1
Backref 2857155837952 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857155837952 16384]
owner ref check failed [2857155837952 16384]
ref mismatch on [2857157509120 16384] extent item 0, found 1
Backref 2857157509120 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857157509120 16384]
owner ref check failed [2857157509120 16384]
ref mismatch on [2857157836800 16384] extent item 0, found 1
Backref 2857157836800 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857157836800 16384]
owner ref check failed [2857157836800 16384]
ref mismatch on [2857160605696 16384] extent item 0, found 1
Backref 2857160605696 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857160605696 16384]
owner ref check failed [2857160605696 16384]
ref mismatch on [2857164636160 16384] extent item 0, found 1
Backref 2857164636160 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857164636160 16384]
owner ref check failed [2857164636160 16384]
ref mismatch on [2857167716352 16384] extent item 0, found 1
Backref 2857167716352 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857167716352 16384]
owner ref check failed [2857167716352 16384]
ref mismatch on [2857168977920 16384] extent item 0, found 1
Backref 2857168977920 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857168977920 16384]
owner ref check failed [2857168977920 16384]
ref mismatch on [2857175269376 16384] extent item 0, found 1
Backref 2857175269376 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857175269376 16384]
owner ref check failed [2857175269376 16384]
ref mismatch on [2857239904256 16384] extent item 0, found 1
Backref 2857239904256 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857239904256 16384]
owner ref check failed [2857239904256 16384]
ref mismatch on [2857241640960 16384] extent item 0, found 1
Backref 2857241640960 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857241640960 16384]
owner ref check failed [2857241640960 16384]
ref mismatch on [2857244409856 16384] extent item 0, found 1
Backref 2857244409856 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [2857244409856 16384]
owner ref check failed [2857244409856 16384]
ref mismatch on [3955758170112 16384] extent item 0, found 1
Backref 3955758170112 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [3955758170112 16384]
ref mismatch on [3955758563328 16384] extent item 0, found 1
Backref 3955758563328 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [3955758563328 16384]
owner ref check failed [3955758563328 16384]
ref mismatch on [3955758678016 16384] extent item 0, found 1
Backref 3955758678016 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [3955758678016 16384]
ref mismatch on [4420194156544 16384] extent item 0, found 1
Backref 4420194156544 parent 4159 root 4159 not found in extent tree
backpointer mismatch on [4420194156544 16384]
Errors found in extent allocation tree or chunk allocation
checking free space cache
checking fs roots
checking csums
checking root refs
found 4945849393671 bytes used err is 0
total csum bytes: 4821697620
total tree bytes: 8430518272
total fs tree bytes: 2181136384
total extent tree bytes: 740294656
btree space waste bytes: 955676550
file data blocks allocated: 7672438157312
 referenced 7740136660992
btrfs-progs v4.0


Any ideas?

Cheers,
Chris.

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