Hello,
Somehow it appears the csum_type on my btrfs file system got corrupted.
I cannot mount the system in recovery or read only. btrfs check just
returns "ERROR: unsupported checksum algorithm 35355" as well as btrfs
recover. The only command I was able to successfully run was btrfs
inspect-internal dump-super, which I've pasted the output at the end of
this message.
Requested information from the wiki:
Linux 4.15.7-1-ARCH #1 SMP PREEMPT Wed Feb 28 19:01:57 UTC 2018 x86_64
GNU/Linux
btrfs-progs v4.15.1
btrfs fi show: ERROR: unsupported checksum algorithm 35355 ERROR: cannot
scan /dev/mapper/x: Input/output error
dmesg:
[ 11.232399] Btrfs loaded, crc32c=crc32c-intel
[ 11.233229] BTRFS: device fsid 513f07e1-08be-4d94-a55c-11c6251f6c2f
devid 1 transid 7777 /dev/dm-2
[ 488.372891] BTRFS error (device dm-2): unsupported checksum algorithm
35355
[ 488.372894] BTRFS error (device dm-2): superblock checksum mismatch
[ 488.384902] BTRFS error (device dm-2): open_ctree failed
Is there anything I can do to recovery from this or am I out of luck? To
give some background the disk was working fine until I upgraded to
Kernel 4.15.7 and rebooted.
superblock: bytenr=65536, device=/dev/mapper/x
---------------------------------------------------------
csum_type 35355 (INVALID)
csum_size 32
csum
0xf0dbeddd00000000000000000000000000000000000000000000000000000000 [match]
bytenr 65536
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid 513f07e1-08be-4d94-a55c-11c6251f6c2f
label
generation 7777
root 186466304
sys_array_size 129
chunk_root_generation 7450
root_level 1
chunk_root 21004288
chunk_root_level 1
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 5000947523584
bytes_used 420849201152
sectorsize 4096
nodesize 16384
leafsize (deprecated) 16384
stripesize 4096
root_dir 6
num_devices 1
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x176d200000000169
( MIXED_BACKREF |
COMPRESS_LZO |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA |
unknown flag: 0x176d200000000000 )
cache_generation 7777
uuid_tree_generation 7777
dev_item.uuid 880c692f-5270-4c7a-908d-8b3956fb3790
dev_item.fsid 513f07e1-08be-4d94-a55c-11c6251f6c2f [match]
dev_item.type 0
dev_item.total_bytes 5000947523584
dev_item.bytes_used 457439182848
dev_item.io_align 4096
dev_item.io_width 4096
dev_item.sector_size 4096
dev_item.devid 1
dev_item.dev_group 0
dev_item.seek_speed 0
dev_item.bandwidth 0
dev_item.generation 0
sys_chunk_array[2048]:
item 0 key (FIRST_CHUNK_TREE CHUNK_ITEM 20971520)
length 8388608 owner 2 stripe_len 65536 type SYSTEM|DUP
io_align 65536 io_width 65536 sector_size 4096
num_stripes 2 sub_stripes 0
stripe 0 devid 1 offset 20971520
dev_uuid 880c692f-5270-4c7a-908d-8b3956fb3790
stripe 1 devid 1 offset 29360128
dev_uuid 880c692f-5270-4c7a-908d-8b3956fb3790
backup_roots[4]:
backup 0:
backup_tree_root: 181174272 gen: 7774 level: 1
backup_chunk_root: 21004288 gen: 7450 level: 1
backup_extent_root: 181190656 gen: 7774 level: 2
backup_fs_root: 809828352 gen: 6404 level: 0
backup_dev_root: 93585408 gen: 7631 level: 1
backup_csum_root: 181862400 gen: 7774 level: 2
backup_total_bytes: 5000947523584
backup_bytes_used: 420849201152
backup_num_devices: 1
backup 1:
backup_tree_root: 183828480 gen: 7775 level: 1
backup_chunk_root: 21004288 gen: 7450 level: 1
backup_extent_root: 183320576 gen: 7775 level: 2
backup_fs_root: 809828352 gen: 6404 level: 0
backup_dev_root: 183975936 gen: 7775 level: 1
backup_csum_root: 185761792 gen: 7775 level: 2
backup_total_bytes: 5000947523584
backup_bytes_used: 420849201152
backup_num_devices: 1
backup 2:
backup_tree_root: 186810368 gen: 7776 level: 1
backup_chunk_root: 21004288 gen: 7450 level: 1
backup_extent_root: 186613760 gen: 7776 level: 2
backup_fs_root: 809828352 gen: 6404 level: 0
backup_dev_root: 183975936 gen: 7775 level: 1
backup_csum_root: 187056128 gen: 7776 level: 2
backup_total_bytes: 5000947523584
backup_bytes_used: 420849201152
backup_num_devices: 1
backup 3:
backup_tree_root: 186466304 gen: 7777 level: 1
backup_chunk_root: 21004288 gen: 7450 level: 1
backup_extent_root: 187908096 gen: 7777 level: 2
backup_fs_root: 809828352 gen: 6404 level: 0
backup_dev_root: 183975936 gen: 7775 level: 1
backup_csum_root: 188071936 gen: 7777 level: 2
backup_total_bytes: 5000947523584
backup_bytes_used: 420849201152
backup_num_devices: 1
superblock: bytenr=67108864, device=/dev/mapper/x
---------------------------------------------------------
csum_type 35355 (INVALID)
csum_size 32
csum
0x50bac51300000000000000000000000000000000000000000000000000000000
[DON'T MATCH]
bytenr 67108864
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid 513f07e1-08be-4d94-a55c-11c6251f6c2f
label
generation 7777
root 186466304
sys_array_size 129
chunk_root_generation 7450
root_level 1
chunk_root 21004288
chunk_root_level 1
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 5000947523584
bytes_used 420849201152
sectorsize 4096
nodesize 16384
leafsize (deprecated) 16384
stripesize 4096
root_dir 6
num_devices 1
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x176d200000000169
( MIXED_BACKREF |
COMPRESS_LZO |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA |
unknown flag: 0x176d200000000000 )
cache_generation 7777
uuid_tree_generation 7777
dev_item.uuid 880c692f-5270-4c7a-908d-8b3956fb3790
dev_item.fsid 513f07e1-08be-4d94-a55c-11c6251f6c2f [match]
dev_item.type 0
dev_item.total_bytes 5000947523584
dev_item.bytes_used 457439182848
dev_item.io_align 4096
dev_item.io_width 4096
dev_item.sector_size 4096
dev_item.devid 1
dev_item.dev_group 0
dev_item.seek_speed 0
dev_item.bandwidth 0
dev_item.generation 0
sys_chunk_array[2048]:
item 0 key (FIRST_CHUNK_TREE CHUNK_ITEM 20971520)
length 8388608 owner 2 stripe_len 65536 type SYSTEM|DUP
io_align 65536 io_width 65536 sector_size 4096
num_stripes 2 sub_stripes 0
stripe 0 devid 1 offset 20971520
dev_uuid 880c692f-5270-4c7a-908d-8b3956fb3790
stripe 1 devid 1 offset 29360128
dev_uuid 880c692f-5270-4c7a-908d-8b3956fb3790
backup_roots[4]:
backup 0:
backup_tree_root: 181174272 gen: 7774 level: 1
backup_chunk_root: 21004288 gen: 7450 level: 1
backup_extent_root: 181190656 gen: 7774 level: 2
backup_fs_root: 809828352 gen: 6404 level: 0
backup_dev_root: 93585408 gen: 7631 level: 1
backup_csum_root: 181862400 gen: 7774 level: 2
backup_total_bytes: 5000947523584
backup_bytes_used: 420849201152
backup_num_devices: 1
backup 1:
backup_tree_root: 183828480 gen: 7775 level: 1
backup_chunk_root: 21004288 gen: 7450 level: 1
backup_extent_root: 183320576 gen: 7775 level: 2
backup_fs_root: 809828352 gen: 6404 level: 0
backup_dev_root: 183975936 gen: 7775 level: 1
backup_csum_root: 185761792 gen: 7775 level: 2
backup_total_bytes: 5000947523584
backup_bytes_used: 420849201152
backup_num_devices: 1
backup 2:
backup_tree_root: 186810368 gen: 7776 level: 1
backup_chunk_root: 21004288 gen: 7450 level: 1
backup_extent_root: 186613760 gen: 7776 level: 2
backup_fs_root: 809828352 gen: 6404 level: 0
backup_dev_root: 183975936 gen: 7775 level: 1
backup_csum_root: 187056128 gen: 7776 level: 2
backup_total_bytes: 5000947523584
backup_bytes_used: 420849201152
backup_num_devices: 1
backup 3:
backup_tree_root: 186466304 gen: 7777 level: 1
backup_chunk_root: 21004288 gen: 7450 level: 1
backup_extent_root: 187908096 gen: 7777 level: 2
backup_fs_root: 809828352 gen: 6404 level: 0
backup_dev_root: 183975936 gen: 7775 level: 1
backup_csum_root: 188071936 gen: 7777 level: 2
backup_total_bytes: 5000947523584
backup_bytes_used: 420849201152
backup_num_devices: 1
superblock: bytenr=274877906944, device=/dev/mapper/x
---------------------------------------------------------
csum_type 35355 (INVALID)
csum_size 32
csum
0xad3d932200000000000000000000000000000000000000000000000000000000
[DON'T MATCH]
bytenr 274877906944
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid 513f07e1-08be-4d94-a55c-11c6251f6c2f
label
generation 7777
root 186466304
sys_array_size 129
chunk_root_generation 7450
root_level 1
chunk_root 21004288
chunk_root_level 1
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 5000947523584
bytes_used 420849201152
sectorsize 4096
nodesize 16384
leafsize (deprecated) 16384
stripesize 4096
root_dir 6
num_devices 1
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x176d200000000169
( MIXED_BACKREF |
COMPRESS_LZO |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA |
unknown flag: 0x176d200000000000 )
cache_generation 7777
uuid_tree_generation 7777
dev_item.uuid 880c692f-5270-4c7a-908d-8b3956fb3790
dev_item.fsid 513f07e1-08be-4d94-a55c-11c6251f6c2f [match]
dev_item.type 0
dev_item.total_bytes 5000947523584
dev_item.bytes_used 457439182848
dev_item.io_align 4096
dev_item.io_width 4096
dev_item.sector_size 4096
dev_item.devid 1
dev_item.dev_group 0
dev_item.seek_speed 0
dev_item.bandwidth 0
dev_item.generation 0
sys_chunk_array[2048]:
item 0 key (FIRST_CHUNK_TREE CHUNK_ITEM 20971520)
length 8388608 owner 2 stripe_len 65536 type SYSTEM|DUP
io_align 65536 io_width 65536 sector_size 4096
num_stripes 2 sub_stripes 0
stripe 0 devid 1 offset 20971520
dev_uuid 880c692f-5270-4c7a-908d-8b3956fb3790
stripe 1 devid 1 offset 29360128
dev_uuid 880c692f-5270-4c7a-908d-8b3956fb3790
backup_roots[4]:
backup 0:
backup_tree_root: 181174272 gen: 7774 level: 1
backup_chunk_root: 21004288 gen: 7450 level: 1
backup_extent_root: 181190656 gen: 7774 level: 2
backup_fs_root: 809828352 gen: 6404 level: 0
backup_dev_root: 93585408 gen: 7631 level: 1
backup_csum_root: 181862400 gen: 7774 level: 2
backup_total_bytes: 5000947523584
backup_bytes_used: 420849201152
backup_num_devices: 1
backup 1:
backup_tree_root: 183828480 gen: 7775 level: 1
backup_chunk_root: 21004288 gen: 7450 level: 1
backup_extent_root: 183320576 gen: 7775 level: 2
backup_fs_root: 809828352 gen: 6404 level: 0
backup_dev_root: 183975936 gen: 7775 level: 1
backup_csum_root: 185761792 gen: 7775 level: 2
backup_total_bytes: 5000947523584
backup_bytes_used: 420849201152
backup_num_devices: 1
backup 2:
backup_tree_root: 186810368 gen: 7776 level: 1
backup_chunk_root: 21004288 gen: 7450 level: 1
backup_extent_root: 186613760 gen: 7776 level: 2
backup_fs_root: 809828352 gen: 6404 level: 0
backup_dev_root: 183975936 gen: 7775 level: 1
backup_csum_root: 187056128 gen: 7776 level: 2
backup_total_bytes: 5000947523584
backup_bytes_used: 420849201152
backup_num_devices: 1
backup 3:
backup_tree_root: 186466304 gen: 7777 level: 1
backup_chunk_root: 21004288 gen: 7450 level: 1
backup_extent_root: 187908096 gen: 7777 level: 2
backup_fs_root: 809828352 gen: 6404 level: 0
backup_dev_root: 183975936 gen: 7775 level: 1
backup_csum_root: 188071936 gen: 7777 level: 2
backup_total_bytes: 5000947523584
backup_bytes_used: 420849201152
backup_num_devices: 1
Thank you,
Ken
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