Could be the result of a Btrfs bug in an older kernel, and it's only
now being caught because of the tree checker.
Ah, ok.
Is this a real problem and how can I fix it?
Good question. The kernel message is very convincing, in that it
suggests it knows exactly what the problem is and what the expected
value should be. I'd like to believe 'btrfs check' could fix it.
What do you get for:
btrfs insp dump-t -b 78397440 /dev/
# btrfs insp dump-t -b 78397440 /dev/sda8
btrfs-progs v5.4
leaf 78397440 items 26 free space 1525 generation 295254 owner FS_TREE
leaf 78397440 flags 0x1(WRITTEN) backref revision 1
fs uuid d6954ba3-3d50-4886-ae3f-a92a5ca83923
chunk uuid d8f00ac1-fb3b-474e-9957-ebfd773fa8af
item 0 key (1332998 DIR_ITEM 3130087984) itemoff 3925 itemsize 70
location key (3507605 INODE_ITEM 0) type FILE
transid 294390 data_len 0 name_len 40
name: 8BB587804509CED5F513154BC0A363B28181CA32
item 1 key (1332998 DIR_ITEM 3130144874) itemoff 3855 itemsize 70
location key (3512356 INODE_ITEM 0) type FILE
transid 294697 data_len 0 name_len 40
name: C2CC7DE8F9C94004389D79E12B48337A0BF131F2
item 2 key (1332998 DIR_ITEM 3130492080) itemoff 3785 itemsize 70
location key (3512915 INODE_ITEM 0) type FILE
transid 294745 data_len 0 name_len 40
name: 5EBCE6B1C5DEC3FBD7F54B204ABB7B27869F46C5
item 3 key (1332998 DIR_ITEM 3131798930) itemoff 3715 itemsize 70
location key (3498678 INODE_ITEM 0) type FILE
transid 293709 data_len 0 name_len 40
name: 79CA97CB52BB10347B366E29B14032B50CB32FEB
item 4 key (1332998 DIR_ITEM 3132247620) itemoff 3645 itemsize 70
location key (3516250 INODE_ITEM 0) type FILE
transid 294988 data_len 0 name_len 40
name: C2ED3E58BA3DF162034E5DF958A36B3730CE2D22
item 5 key (1332998 DIR_ITEM 3132872963) itemoff 3575 itemsize 70
location key (3510772 INODE_ITEM 0) type FILE
transid 294612 data_len 0 name_len 40
name: 2B1D8D0EABE3270CD3861650E33AA152211269A5
item 6 key (1332998 DIR_ITEM 3133521864) itemoff 3505 itemsize 70
location key (3513293 INODE_ITEM 0) type FILE
transid 294757 data_len 0 name_len 40
name: 1C31C9DFD79A176FC74E841C1B3E1EEAAFAD6DB8
item 7 key (1332998 DIR_ITEM 3135778465) itemoff 3435 itemsize 70
location key (3499818 INODE_ITEM 0) type FILE
transid 293763 data_len 0 name_len 40
name: 6B3F3BF6770F6D765B985D9DEA817D232F516B42
item 8 key (1332998 DIR_ITEM 3136033001) itemoff 3365 itemsize 70
location key (3514224 INODE_ITEM 0) type FILE
transid 294859 data_len 0 name_len 40
name: C2F67FEC928AD09C70D6E5E34306151606C5E766
item 9 key (1332998 DIR_ITEM 3136068331) itemoff 3295 itemsize 70
location key (3499950 INODE_ITEM 0) type FILE
transid 293785 data_len 0 name_len 40
name: 2076D0DCF0B92263B870A342D6335750D53E3979
item 10 key (1332998 DIR_ITEM 3136862813) itemoff 3225 itemsize 70
location key (3516141 INODE_ITEM 0) type FILE
transid 294979 data_len 0 name_len 40
name: B351730279BAEA46FFA75C81BB4845A3279588CE
item 11 key (1332998 DIR_ITEM 3136903919) itemoff 3155 itemsize 70
location key (3514752 INODE_ITEM 0) type FILE
transid 294925 data_len 0 name_len 40
name: 6DB8F41C0DC906C3B6B67236366F02B27AF754F6
item 12 key (1332998 DIR_ITEM 3137030161) itemoff 3085 itemsize 70
location key (3514647 INODE_ITEM 0) type FILE
transid 294918 data_len 0 name_len 40
name: 4FDECAE1E8623BE30F252BB797773339DF0347E6
item 13 key (1332998 DIR_ITEM 3137466626) itemoff 3015 itemsize 70
location key (3511789 INODE_ITEM 0) type FILE
transid 294677 data_len 0 name_len 40
name: 2B39C52481A95C302F6883978494B14FA0414D6C
item 14 key (1332998 DIR_ITEM 3138020936) itemoff 2945 itemsize 70
location key (3510913 INODE_ITEM 0) type FILE
transid 294628 data_len 0 name_len 40
name: 7E3F74EFB7086FB86BC15485C76E171C5A5C6CDE
item 15 key (1332998 DIR_ITEM 3138122317) itemoff 2875 itemsize 70
location key (3510027 INODE_ITEM 0) type FILE
transid 294561 data_len 0 name_len 40
name: 02C3D9DB2E70F46B5608C69CB45896B575603517
item 16 key (1332998 DIR_ITEM 3138185936) itemoff 2805 itemsize 70
location key (3507136 INODE_ITEM 0) type FILE
transid 294347 data_len 0 name_len 40
name: B9D99E4DB2E137511AE8D8279D5858D823EF9C13
item 17 key (1332998 DIR_ITEM 3139327597) itemoff 2735 itemsize 70
location key (3510124 INODE_ITEM 0) type FILE
transid 294562 data_len 0 name_len 40
name: 4C27C41B0A8845515F1B9B25003B0B45BB4DD942
item 18 key (1332998 DIR_ITEM 3140643033) itemoff 2665 itemsize 70
location key (3511959 INODE_ITEM 0) type FILE
transid 294685 data_len 0 name_len 40
name: 95094F9E4F311506768734893846734F27AD2E20
item 19 key (1332998 DIR_ITEM 3140704695) itemoff 2595 itemsize 70
location key (3498378 INODE_ITEM 0) type FILE
transid 293709 data_len 0 name_len 40
name: 5B7D840DD5967F3EC451425E546D2C03500A1CB3
item 20 key (1332998 DIR_ITEM 3141274869) itemoff 2525 itemsize 70
location key (3502212 INODE_ITEM 0) type FILE
transid 294041 data_len 0 name_len 40
name: BED3483239921D9909FA486DA35757873112DD86
item 21 key (1332998 DIR_ITEM 3142456641) itemoff 2455 itemsize 70
location key (3511305 INODE_ITEM 0) type FILE
transid 294647 data_len 0 name_len 40
name: 9B1EFDA864E04F6D149EE97494DD7D3D9DAAB971
item 22 key (1332998 DIR_ITEM 3142477919) itemoff 2385 itemsize 70
location key (3509650 INODE_ITEM 0) type FILE
transid 294548 data_len 0 name_len 40
name: 775E4D8DE2F4BA8F68D90F3CD6E89B5192D9D9C4
item 23 key (1332998 DIR_ITEM 3143784176) itemoff 2315 itemsize 70
location key (3504110 INODE_ITEM 0) type FILE
transid 294149 data_len 0 name_len 40
name: 5E503D5DF967A3BF5A857CA69C661F4F7DE481E3
item 24 key (1332998 DIR_ITEM 3144212607) itemoff 2245 itemsize 70
location key (3498707 INODE_ITEM 0) type FILE
transid 293710 data_len 0 name_len 40
name: E11D377B142C50C7895AEB8961960471155F1ECE
item 25 key (1332998 DIR_ITEM 3145170596) itemoff 2175 itemsize 70
location key (3507702 INODE_ITEM 0) type FILE
transid 294396 data_len 0 name_len 40
name: DC6939EC397EB57C8812D34FDE5F3E1483BFA999
If there are filenames in the output you can remove/sanitize them.
These strange filenames are cache files from firefox and so I just deleted them. But if I put in other block numbers which appear in dmesg for dump-t I am not so lucky:
# btrfs insp dump-t -b 285405184 /dev/sda8
btrfs-progs v5.4
node 285405184 level 1 items 61 free 60 generation 295475 owner FS_TREE
fs uuid d6954ba3-3d50-4886-ae3f-a92a5ca83923
chunk uuid d8f00ac1-fb3b-474e-9957-ebfd773fa8af
key (3516683 DIR_INDEX 3) block 300871680 gen 295475
key (3516699 INODE_ITEM 0) block 300953600 gen 295475
key (3516703 INODE_ITEM 0) block 300957696 gen 295475
key (3516708 INODE_ITEM 0) block 301015040 gen 295475
key (3516713 INODE_ITEM 0) block 301092864 gen 295475
key (3516716 INODE_REF 3516669) block 301326336 gen 295475
key (3516734 INODE_ITEM 0) block 299872256 gen 295475
key (3516760 INODE_ITEM 0) block 232648704 gen 295425
key (3516869 INODE_ITEM 0) block 236732416 gen 295426
key (3516983 INODE_ITEM 0) block 61214720 gen 295147
key (3516989 INODE_REF 1332998) block 285138944 gen 295474
key (3516994 INODE_REF 1332998) block 42741760 gen 295123
key (3517014 EXTENT_DATA 0) block 133730304 gen 295316
key (3517028 EXTENT_DATA 0) block 42749952 gen 295123
key (3517051 INODE_ITEM 0) block 301330432 gen 295475
key (3517278 INODE_ITEM 0) block 39383040 gen 295123
key (3517279 EXTENT_DATA 0) block 42758144 gen 295123
key (3517282 EXTENT_DATA 0) block 44212224 gen 295127
key (3517326 INODE_ITEM 0) block 31232000 gen 295168
key (3517380 INODE_ITEM 0) block 29921280 gen 295168
key (3517404 INODE_ITEM 0) block 34881536 gen 295169
key (3517693 INODE_ITEM 0) block 31338496 gen 295168
key (3517694 INODE_REF 1332998) block 76279808 gen 295154
key (3517697 INODE_ITEM 0) block 279601152 gen 295466
key (3517714 INODE_ITEM 0) block 133726208 gen 295316
key (3517724 INODE_REF 1332998) block 35565568 gen 295172
key (3517745 INODE_REF 1332998) block 31219712 gen 295168
key (3517799 INODE_ITEM 0) block 32735232 gen 295168
key (3517895 INODE_ITEM 0) block 50614272 gen 295133
key (3517902 EXTENT_DATA 0) block 50130944 gen 295133
key (3517909 EXTENT_DATA 0) block 52219904 gen 295135
key (3517914 INODE_REF 1332998) block 52719616 gen 295135
key (3517928 INODE_REF 1332998) block 135065600 gen 295316
key (3517944 INODE_REF 1332998) block 135098368 gen 295316
key (3517970 EXTENT_DATA 0) block 76419072 gen 295150
key (3517988 INODE_REF 1332998) block 134750208 gen 295316
key (3518000 INODE_ITEM 0) block 134791168 gen 295316
key (3518014 INODE_ITEM 0) block 62775296 gen 295149
key (3518018 EXTENT_DATA 8192) block 79409152 gen 295163
key (3518028 EXTENT_DATA 12288) block 283504640 gen 295474
key (3518032 EXTENT_DATA 0) block 283484160 gen 295474
key (3518037 INODE_ITEM 0) block 283791360 gen 295474
key (3518082 INODE_ITEM 0) block 32157696 gen 295168
key (3518107 INODE_ITEM 0) block 285437952 gen 295475
key (3518161 INODE_ITEM 0) block 35807232 gen 295172
key (3518161 INODE_REF 3504139) block 51822592 gen 295224
key (3518193 INODE_ITEM 0) block 285536256 gen 295471
key (3518205 EXTENT_DATA 126976) block 281796608 gen 295471
key (3518208 INODE_ITEM 0) block 130437120 gen 295269
key (3518219 EXTENT_DATA 0) block 283009024 gen 295473
key (3518247 INODE_ITEM 0) block 282075136 gen 295473
key (3518250 INODE_REF 528) block 283881472 gen 295473
key (3518465 INODE_ITEM 0) block 228093952 gen 295422
key (3518918 INODE_ITEM 0) block 228143104 gen 295422
key (3518947 EXTENT_DATA 0) block 124354560 gen 295289
key (3519052 INODE_ITEM 0) block 124669952 gen 295289
key (3519062 EXTENT_DATA 0) block 282337280 gen 295473
key (3519069 EXTENT_DATA 0) block 126033920 gen 295263
key (3519086 INODE_ITEM 0) block 113582080 gen 295276
key (3519090 INODE_ITEM 0) block 261554176 gen 295445
key (3519132 INODE_ITEM 0) block 126877696 gen 295269
Here I can't spot a filename.
btrfs check /dev/
After deleting these cache files btrfs check still gives no error.
This should give a good idea whether --repair can fix it, but we'll
need to hear from a developer about it first. In the meantime you can
make sure the backup is current.
I backup up all my data.
I wonder if these errors would be gone if I reinstalled my system and copied back my data.
Would cost me a few hours but maybe not more than trying to fix this.
Thanks for your help,
Matthias
