Info: Force to fix corruption
Info: Dry run
Info: Segments per section = 1
Info: Sections per zone = 1
Info: sector size = 512
Info: total sectors = 4194304 (2048 MB)
Info: MKFS version
  "Linux version 4.15.0-29-generic (buildd@lgw01-amd64-057) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #31-Ubuntu SMP Tue Jul 17 15:39:52 UTC 2018"
Info: FSCK version
  from "Linux version 4.15.0-29-generic (buildd@lgw01-amd64-057) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #31-Ubuntu SMP Tue Jul 17 15:39:52 UTC 2018"
    to "Linux version 4.15.0-29-generic (buildd@lgw01-amd64-057) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #31-Ubuntu SMP Tue Jul 17 15:39:52 UTC 2018"
Info: superblock features = 0 :
Info: superblock encrypt level = 0, salt = 00000000000000000000000000000000
Info: total FS sectors = 4194304 (2048 MB)
Info: CKPT version = 15bf3e60
Info: Corrupted valid nat_bits in checkpoint
Info: Write valid nat_bits in checkpoint
Info: checkpoint state = 5c1 :  large_nat_bitmap trimmed nat_bits crc unmount
[FIX] (fsck_chk_inode_blk: 960)  --> Regular: 0xbd reset i_gc_failures from 0x1 to 0x00
[FIX] (fsck_chk_inode_blk: 960)  --> Regular: 0xbe reset i_gc_failures from 0x1 to 0x00
[FIX] (fsck_chk_inode_blk: 960)  --> Regular: 0xbf reset i_gc_failures from 0x1 to 0x00
[FIX] (fsck_chk_inode_blk: 960)  --> Regular: 0xc0 reset i_gc_failures from 0x1 to 0x00
[FIX] (fsck_chk_inode_blk: 960)  --> Regular: 0xc1 reset i_gc_failures from 0x1 to 0x00
[FIX] (fsck_chk_inode_blk: 960)  --> Regular: 0xc2 reset i_gc_failures from 0x1 to 0x00
[FIX] (fsck_chk_inode_blk: 960)  --> Regular: 0xc3 reset i_gc_failures from 0x1 to 0x00
// skip

[ASSERT] (sanity_check_nid: 391)  --> nid[0x1c7] ino is 0
[FIX] (__chk_dentries:1507)  --> Unlink [0x1c7] - index.db len[0x8], type[0x1]
[FIX] (fsck_chk_inode_blk: 960)  --> Regular: 0x1c6 reset i_gc_failures from 0x1 to 0x00
[ASSERT] (sanity_check_nid: 391)  --> nid[0x1c9] ino is 0
[FIX] (__chk_dentries:1507)  --> Unlink [0x1c9] - index.db len[0x8], type[0x1]
[ASSERT] (sanity_check_nid: 391)  --> nid[0x1c8] ino is 0
[FIX] (__chk_dentries:1507)  --> Unlink [0x1c8] - CACHEDIR.TAG len[0xc], type[0x1]
[ASSERT] (sanity_check_nid: 391)  --> nid[0x1cb] ino is 0
[FIX] (__chk_dentries:1507)  --> Unlink [0x1cb] - index.db len[0x8], type[0x1]
[ASSERT] (sanity_check_nid: 391)  --> nid[0x1ca] ino is 0
// skip

NID[0xfff] is unreachable, blkaddr:0x3f28
NID[0x1000] is unreachable, blkaddr:0x3f29
NID[0x1001] is unreachable, blkaddr:0x3f2a
NID[0x1002] is unreachable, blkaddr:0x3f2b
NID[0x1003] is unreachable, blkaddr:0x3f2c
NID[0x1004] is unreachable, blkaddr:0x3f2d
NID[0x1005] is unreachable, blkaddr:0x3f2e
NID[0x1006] is unreachable, blkaddr:0x3f2f
//skip

[FSCK] Unreachable nat entries                        [Fail] [0x8d8]
[FSCK] SIT valid block bitmap checking                [Fail]
[FSCK] Hard link checking for regular file            [Ok..] [0x0]
[FSCK] valid_block_count matching with CP             [Fail] [0x8d3e]
[FSCK] valid_node_count matcing with CP (de lookup)   [Fail] [0x1cf]
[FSCK] valid_node_count matcing with CP (nat lookup)  [Fail] [0xaa7]
[FSCK] valid_inode_count matched with CP              [Fail] [0x1b3]
[FSCK] free segment_count matched with CP             [Ok..] [0x2d9]
[FSCK] next block offset is free                      [Ok..]
[FSCK] fixing SIT types
[FSCK] other corrupted bugs                           [Fail]

Do you want to restore lost files into ./lost_found/? [Y/N] n

Info: Write valid nat_bits in checkpoint
[FIX] (nullify_nat_entry:2286)  --> Remove nid [0xfff] in NAT
[FIX] (nullify_nat_entry:2286)  --> Remove nid [0x1000] in NAT
[FIX] (nullify_nat_entry:2286)  --> Remove nid [0x1001] in NAT
[FIX] (nullify_nat_entry:2286)  --> Remove nid [0x1002] in NAT
[FIX] (nullify_nat_entry:2286)  --> Remove nid [0x1003] in NAT
[FIX] (nullify_nat_entry:2286)  --> Remove nid [0x1004] in NAT
[FIX] (nullify_nat_entry:2286)  --> Remove nid [0x1005] in NAT
[FIX] (nullify_nat_entry:2286)  --> Remove nid [0x1006] in NAT
[FIX] (nullify_nat_entry:2286)  --> Remove nid [0x1007] in NAT
[FIX] (nullify_nat_entry:2286)  --> Remove nid [0x1008] in NAT
[FIX] (nullify_nat_entry:2286)  --> Remove nid [0x1009] in NAT
// skip

Info: Write valid nat_bits in checkpoint

Done.