btrfs error

[66901.252233] BTRFS: error (device dm-4) in btrfs_drop_snapshot:5421: errno=-4 unknown
[66901.252242] BTRFS info (device dm-4): forced readonly
[66901.252276] BTRFS info (device dm-4): balance: ended with status: -4

[67038.896520] BTRFS error (device dm-4): parent transid verify failed on 18459841904640 wanted 11683 found 11678
[67038.901877] BTRFS error (device dm-4): parent transid verify failed on 18459841904640 wanted 11683 found 11678
[67038.901886] BTRFS info (device dm-4): no csum found for inode 10091786 start 9969664
[67038.916576] BTRFS warning (device dm-4): csum failed root 13186 ino 10091786 off 9969664 csum 0x1ed72d4d expected csum 0x00000000 mirror 1