From: Tim Walberg <twalberg@comcast.net>
To: Qu Wenruo <quwenruo.btrfs@gmx.com>
Cc: Tim Walberg <twalberg@comcast.net>, linux-btrfs@vger.kernel.org
Subject: Re: recovering from "parent transid verify failed"
Date: Thu, 15 Aug 2019 09:21:05 -0500 [thread overview]
Message-ID: <20190815142105.GE2731@comcast.net> (raw)
In-Reply-To: <b871da91-1330-f8c9-add8-858025a91fc9@gmx.com>
[-- Attachment #1: Type: text/plain, Size: 4413 bytes --]
'dump-super -Ffa' from all three devices attached.
'btrfs restore' did appear to recover most of the main data, minus
snapshots, which would have greatly increased the required time and
capacity, since I was recovering to XFS.
'btrfs rescue chunk-recover' ran, but failed to fix anything.
'btrfs rescue super-recover' says all supers are fine.
Initial corruption was due to a hard hang, which didn't leave enough
crumbs to determine the source - might have been btrfs, might have
been nvidia, might have been something completely different.
On 08/15/2019 22:07 +0800, Qu Wenruo wrote:
>>
>>
>> On 2019/8/15 ??????9:52, Tim Walberg wrote:
>> > Had to wait for 'btrfs recover' to finish before I proceed farther.
>> >
>> > Kernel is 4.19.45, tools are 4.19.1
>> >
>> > File system is a 3-disk RAID10 with WD3003FZEX (WD Black 3TB)
>> >
>> > Output from attempting to mount:
>> >
>> > # mount -o ro,usebackuproot /dev/sdc1 /mnt
>> > mount: wrong fs type, bad option, bad superblock on /dev/sdc1,
>> > missing codepage or helper program, or other error
>> >
>> > In some cases useful info is found in syslog - try
>> > dmesg | tail or so.
>> >
>> > Kernel messages from the mount attempt:
>> >
>> > [Thu Aug 15 08:47:42 2019] BTRFS info (device sdc1): trying to use backup root at mount time
>> > [Thu Aug 15 08:47:42 2019] BTRFS info (device sdc1): disk space caching is enabled
>> > [Thu Aug 15 08:47:42 2019] BTRFS info (device sdc1): has skinny extents
>> > [Thu Aug 15 08:47:42 2019] BTRFS error (device sdc1): parent transid verify failed on 229846466560 wanted 49749 found 49750
>> > [Thu Aug 15 08:47:42 2019] BTRFS error (device sdc1): parent transid verify failed on 229846466560 wanted 49749 found 49750
>> > [Thu Aug 15 08:47:42 2019] BTRFS error (device sdc1): failed to read block groups: -5
>>
>> Extent tree corruption.
>>
>> So if that's the only corruption, you have a very high chance to recover
>> most of your data.
>>
>> Btrfs rescue can work, or you can try the experimental patches which
>> provides rescue=skip_bg mount option to allow you mount the fs RO and
>> receive your data (later is way faster than user space rescue)
>> https://patchwork.kernel.org/project/linux-btrfs/list/?series=130637
>>
>> Also, for your dump super output, it doesn't provide too much info.
>>
>> You would like to use -Ffa option for more info.
>> Also, you could also try that on all 3 devices, to find out which one
>> has lower generation.
>>
>> Also, please provide the history of the corruption.
>> One generation corruptions is a little rare. Is sudden power loss
>> involved in this case?
>>
>> Thanks,
>> Qu
>>
>> > [Thu Aug 15 08:47:42 2019] BTRFS error (device sdc1): open_ctree failed
>> >
>> > Output from 'btrfs check -p /dev/sdc1':
>> >
>> > # btrfs check -p /dev/sdc1
>> > Opening filesystem to check...
>> > parent transid verify failed on 229846466560 wanted 49749 found 49750
>> > Ignoring transid failure
>> > ERROR: child eb corrupted: parent bytenr=229845336064 item=0 parent level=1 child level=2
>> > ERROR: cannot open file system
>> >
>> >
>> >
>> > On 08/15/2019 10:35 +0800, Qu Wenruo wrote:
>> >>>
>> >>>
>> >>> On 2019/8/15 ??????2:32, Tim Walberg wrote:
>> >>> > Most of the recommendations I've found online deal with when "wanted" is
>> >>> > greater than "found", which, if I understand correctly means that one or
>> >>> > more transactions were interrupted/lost before fully committed.
>> >>>
>> >>> No matter what the case is, a proper transaction shouldn't have any tree
>> >>> block overwritten.
>> >>>
>> >>> That means, either the FLUSH/FUA of the hardware/lower block layer is
>> >>> screwed up, or the COW of tree block is already screwed up.
>> >>>
>> >>> >
>> >>> > Are the recommendations for recovery the same if the system is reporting a
>> >>> > "wanted" that is less than "found"?
>> >>> >
>> >>> The salvage is no difference than any transid mismatch, no matter if
>> >>> it's larger or smaller.
>> >>>
>> >>> It depends on the tree block.
>> >>>
>> >>> Please provide full dmesg output and btrfs check for further advice.
>> >>>
>> >>> Thanks,
>> >>> Qu
>> >>>
>> >
>> >
>> >
>> >
>>
End of included message
--
+----------------------+
| Tim Walberg |
| 830 Carriage Dr. |
| Algonquin, IL 60102 |
| twalberg@comcast.net |
+----------------------+
[-- Attachment #2: supers.txt --]
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backup_extent_root: 2031960915968 gen: 49745 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 230821036032 gen: 49738 level: 1
backup_csum_root: 2031960244224 gen: 49745 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085802795008
backup_num_devices: 3
backup 3:
backup_tree_root: 2032017784832 gen: 49746 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 2031988506624 gen: 49746 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 230821036032 gen: 49738 level: 1
backup_csum_root: 2032023994368 gen: 49746 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085802778624
backup_num_devices: 3
superblock: bytenr=274877906944, device=/dev/sdd1
---------------------------------------------------------
csum_type 0 (crc32c)
csum_size 4
csum 0x8d113766 [match]
bytenr 274877906944
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid 53749823-faaf-46f9-866d-3778d93cb1ca
label btrfs1
generation 49750
root 229846646784
sys_array_size 129
chunk_root_generation 49725
root_level 1
chunk_root 2568857059328
chunk_root_level 1
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 9001775738880
bytes_used 2085801975808
sectorsize 4096
nodesize 16384
leafsize (deprecated) 16384
stripesize 4096
root_dir 6
num_devices 3
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x361
( MIXED_BACKREF |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA |
NO_HOLES )
cache_generation 49748
uuid_tree_generation 49748
dev_item.uuid acad0cd5-aaec-4f6d-bf61-6c5b26888562
dev_item.fsid 53749823-faaf-46f9-866d-3778d93cb1ca [match]
dev_item.type 0
dev_item.total_bytes 3000591912960
dev_item.bytes_used 1404487860224
dev_item.io_align 4096
dev_item.io_width 4096
dev_item.sector_size 4096
dev_item.devid 2
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 2568857059328)
length 33554432 owner 2 stripe_len 65536 type SYSTEM|RAID1
io_align 65536 io_width 65536 sector_size 4096
num_stripes 2 sub_stripes 1
stripe 0 devid 2 offset 300690702336
dev_uuid acad0cd5-aaec-4f6d-bf61-6c5b26888562
stripe 1 devid 3 offset 1083179008
dev_uuid ee71c327-ff63-4f46-8177-6328976f891f
backup_roots[4]:
backup 0:
backup_tree_root: 205750272 gen: 49747 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 174325760 gen: 49747 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 229931761664 gen: 49747 level: 1
backup_csum_root: 270893056 gen: 49747 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085801975808
backup_num_devices: 3
backup 1:
backup_tree_root: 230054100992 gen: 49748 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 230054117376 gen: 49748 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 229931761664 gen: 49747 level: 1
backup_csum_root: 230736379904 gen: 49748 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085801975808
backup_num_devices: 3
backup 2:
backup_tree_root: 2031969501184 gen: 49745 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 2031960915968 gen: 49745 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 230821036032 gen: 49738 level: 1
backup_csum_root: 2031960244224 gen: 49745 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085802795008
backup_num_devices: 3
backup 3:
backup_tree_root: 2032017784832 gen: 49746 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 2031988506624 gen: 49746 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 230821036032 gen: 49738 level: 1
backup_csum_root: 2032023994368 gen: 49746 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085802778624
backup_num_devices: 3
superblock: bytenr=65536, device=/dev/sde1
---------------------------------------------------------
csum_type 0 (crc32c)
csum_size 4
csum 0xb89a7a2e [match]
bytenr 65536
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid 53749823-faaf-46f9-866d-3778d93cb1ca
label btrfs1
generation 49750
root 229846646784
sys_array_size 129
chunk_root_generation 49725
root_level 1
chunk_root 2568857059328
chunk_root_level 1
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 9001775738880
bytes_used 2085801975808
sectorsize 4096
nodesize 16384
leafsize (deprecated) 16384
stripesize 4096
root_dir 6
num_devices 3
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x361
( MIXED_BACKREF |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA |
NO_HOLES )
cache_generation 49748
uuid_tree_generation 49748
dev_item.uuid ee71c327-ff63-4f46-8177-6328976f891f
dev_item.fsid 53749823-faaf-46f9-866d-3778d93cb1ca [match]
dev_item.type 0
dev_item.total_bytes 3000591912960
dev_item.bytes_used 1405561602048
dev_item.io_align 4096
dev_item.io_width 4096
dev_item.sector_size 4096
dev_item.devid 3
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 2568857059328)
length 33554432 owner 2 stripe_len 65536 type SYSTEM|RAID1
io_align 65536 io_width 65536 sector_size 4096
num_stripes 2 sub_stripes 1
stripe 0 devid 2 offset 300690702336
dev_uuid acad0cd5-aaec-4f6d-bf61-6c5b26888562
stripe 1 devid 3 offset 1083179008
dev_uuid ee71c327-ff63-4f46-8177-6328976f891f
backup_roots[4]:
backup 0:
backup_tree_root: 205750272 gen: 49747 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 174325760 gen: 49747 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 229931761664 gen: 49747 level: 1
backup_csum_root: 270893056 gen: 49747 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085801975808
backup_num_devices: 3
backup 1:
backup_tree_root: 230054100992 gen: 49748 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 230054117376 gen: 49748 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 229931761664 gen: 49747 level: 1
backup_csum_root: 230736379904 gen: 49748 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085801975808
backup_num_devices: 3
backup 2:
backup_tree_root: 2031969501184 gen: 49745 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 2031960915968 gen: 49745 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 230821036032 gen: 49738 level: 1
backup_csum_root: 2031960244224 gen: 49745 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085802795008
backup_num_devices: 3
backup 3:
backup_tree_root: 2032017784832 gen: 49746 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 2031988506624 gen: 49746 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 230821036032 gen: 49738 level: 1
backup_csum_root: 2032023994368 gen: 49746 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085802778624
backup_num_devices: 3
superblock: bytenr=67108864, device=/dev/sde1
---------------------------------------------------------
csum_type 0 (crc32c)
csum_size 4
csum 0x18fb52e0 [match]
bytenr 67108864
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid 53749823-faaf-46f9-866d-3778d93cb1ca
label btrfs1
generation 49750
root 229846646784
sys_array_size 129
chunk_root_generation 49725
root_level 1
chunk_root 2568857059328
chunk_root_level 1
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 9001775738880
bytes_used 2085801975808
sectorsize 4096
nodesize 16384
leafsize (deprecated) 16384
stripesize 4096
root_dir 6
num_devices 3
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x361
( MIXED_BACKREF |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA |
NO_HOLES )
cache_generation 49748
uuid_tree_generation 49748
dev_item.uuid ee71c327-ff63-4f46-8177-6328976f891f
dev_item.fsid 53749823-faaf-46f9-866d-3778d93cb1ca [match]
dev_item.type 0
dev_item.total_bytes 3000591912960
dev_item.bytes_used 1405561602048
dev_item.io_align 4096
dev_item.io_width 4096
dev_item.sector_size 4096
dev_item.devid 3
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 2568857059328)
length 33554432 owner 2 stripe_len 65536 type SYSTEM|RAID1
io_align 65536 io_width 65536 sector_size 4096
num_stripes 2 sub_stripes 1
stripe 0 devid 2 offset 300690702336
dev_uuid acad0cd5-aaec-4f6d-bf61-6c5b26888562
stripe 1 devid 3 offset 1083179008
dev_uuid ee71c327-ff63-4f46-8177-6328976f891f
backup_roots[4]:
backup 0:
backup_tree_root: 205750272 gen: 49747 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 174325760 gen: 49747 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 229931761664 gen: 49747 level: 1
backup_csum_root: 270893056 gen: 49747 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085801975808
backup_num_devices: 3
backup 1:
backup_tree_root: 230054100992 gen: 49748 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 230054117376 gen: 49748 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 229931761664 gen: 49747 level: 1
backup_csum_root: 230736379904 gen: 49748 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085801975808
backup_num_devices: 3
backup 2:
backup_tree_root: 2031969501184 gen: 49745 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 2031960915968 gen: 49745 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 230821036032 gen: 49738 level: 1
backup_csum_root: 2031960244224 gen: 49745 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085802795008
backup_num_devices: 3
backup 3:
backup_tree_root: 2032017784832 gen: 49746 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 2031988506624 gen: 49746 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 230821036032 gen: 49738 level: 1
backup_csum_root: 2032023994368 gen: 49746 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085802778624
backup_num_devices: 3
superblock: bytenr=274877906944, device=/dev/sde1
---------------------------------------------------------
csum_type 0 (crc32c)
csum_size 4
csum 0xe57c04d1 [match]
bytenr 274877906944
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid 53749823-faaf-46f9-866d-3778d93cb1ca
label btrfs1
generation 49750
root 229846646784
sys_array_size 129
chunk_root_generation 49725
root_level 1
chunk_root 2568857059328
chunk_root_level 1
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 9001775738880
bytes_used 2085801975808
sectorsize 4096
nodesize 16384
leafsize (deprecated) 16384
stripesize 4096
root_dir 6
num_devices 3
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x361
( MIXED_BACKREF |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA |
NO_HOLES )
cache_generation 49748
uuid_tree_generation 49748
dev_item.uuid ee71c327-ff63-4f46-8177-6328976f891f
dev_item.fsid 53749823-faaf-46f9-866d-3778d93cb1ca [match]
dev_item.type 0
dev_item.total_bytes 3000591912960
dev_item.bytes_used 1405561602048
dev_item.io_align 4096
dev_item.io_width 4096
dev_item.sector_size 4096
dev_item.devid 3
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 2568857059328)
length 33554432 owner 2 stripe_len 65536 type SYSTEM|RAID1
io_align 65536 io_width 65536 sector_size 4096
num_stripes 2 sub_stripes 1
stripe 0 devid 2 offset 300690702336
dev_uuid acad0cd5-aaec-4f6d-bf61-6c5b26888562
stripe 1 devid 3 offset 1083179008
dev_uuid ee71c327-ff63-4f46-8177-6328976f891f
backup_roots[4]:
backup 0:
backup_tree_root: 205750272 gen: 49747 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 174325760 gen: 49747 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 229931761664 gen: 49747 level: 1
backup_csum_root: 270893056 gen: 49747 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085801975808
backup_num_devices: 3
backup 1:
backup_tree_root: 230054100992 gen: 49748 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 230054117376 gen: 49748 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 229931761664 gen: 49747 level: 1
backup_csum_root: 230736379904 gen: 49748 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085801975808
backup_num_devices: 3
backup 2:
backup_tree_root: 2031969501184 gen: 49745 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 2031960915968 gen: 49745 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 230821036032 gen: 49738 level: 1
backup_csum_root: 2031960244224 gen: 49745 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085802795008
backup_num_devices: 3
backup 3:
backup_tree_root: 2032017784832 gen: 49746 level: 1
backup_chunk_root: 2568857059328 gen: 49725 level: 1
backup_extent_root: 2031988506624 gen: 49746 level: 2
backup_fs_root: 850472665088 gen: 49727 level: 0
backup_dev_root: 230821036032 gen: 49738 level: 1
backup_csum_root: 2032023994368 gen: 49746 level: 3
backup_total_bytes: 9001775738880
backup_bytes_used: 2085802778624
backup_num_devices: 3
next prev parent reply other threads:[~2019-08-15 14:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-14 18:32 recovering from "parent transid verify failed" Tim Walberg
2019-08-15 2:35 ` Qu Wenruo
2019-08-15 13:52 ` Tim Walberg
2019-08-15 14:07 ` Qu Wenruo
2019-08-15 14:21 ` Tim Walberg [this message]
2019-08-15 14:45 ` Qu Wenruo
2019-08-15 15:01 ` Tim Walberg
2019-08-15 13:55 ` Tim Walberg
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