Hey.
Found some time to move on with this:
Frist, I think from my side (i.e. restoring as much as possible) I'm
basically done now, so everything left over here is looking for
possible bugs/etc.
I have from my side no indication that my corruptions were actually a
bug in btrfs... the new notebook used to be unstable for some time and
it might be just that.
Also that second occurrence of csum errors (when I made a image from
the broken fs to external HDD) kinda hints that it may be a memory
issue (though I haven't found time to run memtest86+ yet).
So let's just suppose that btrfs code is as rocksolid as its raid56 is
;-P and assume the issues were cause by some unlucky memory corruption
just happening at the wrong (important) meta-data.
The issue that newer btrfs-progs/kernel don't restore anything at all
from my corrupted fs:
On Fri, 2018-03-09 at 07:48 +0800, Qu Wenruo wrote:
> > So something changed after 4.14, which makes the tools no longer
> > being
> > able to restore at least that what they could restore at 4.14.
>
> This seems to be a regression.
> But I'm not sure if it's the kernel to blame or the btrfs-progs.
>
> >
> >
> > => Some bug recently introduced in btrfs-progs?
>
> Is the "block mapping error" message from kernel or btrfs-progs?
All progs messages unless otherwise noticed.
/dev/mapper/restore being the image from the broken SSD fs.
Everything below was on the OLD laptop (which has probably no memory or
whichever issues) under kernel 4.15.4 and progs 4.15.1.
# btrfs-find-root /dev/mapper/restore
Couldn't map the block 4503658729209856
No mapping for 4503658729209856-4503658729226240
Couldn't map the block 4503658729209856
Superblock thinks the generation is 2083143
Superblock thinks the level is 1
Found tree root at 58572800 gen 2083143 level 1
Well block 27820032(gen: 2083133 level: 1) seems good, but generation/level
doesn't match, want gen: 2083143 level: 1
Well block 25526272(gen: 2083132 level: 1) seems good, but generation/level
doesn't match, want gen: 2083143 level: 1
Well block 21807104(gen: 2083131 level: 1) seems good, but generation/level
doesn't match, want gen: 2083143 level: 1
Well block 11829248(gen: 2083130 level: 1) seems good, but generation/level
doesn't match, want gen: 2083143 level: 1
Well block 8716288(gen: 2083129 level: 1) seems good, but generation/level
doesn't match, want gen: 2083143 level: 1
Well block 6209536(gen: 2083128 level: 1) seems good, but generation/level
doesn't match, want gen: 2083143 level: 1
# btrfs-debug-tree -b 27820032 /dev/mapper/restore
btrfs-progs v4.15.1
Couldn't map the block 4503658729209856
No mapping for 4503658729209856-4503658729226240
Couldn't map the block 4503658729209856
bytenr mismatch, want=4503658729209856, have=0
node 27820032 level 1 items 2 free 491 generation 2083133 owner 1
fs uuid b6050e38-716a-40c3-a8df-fcf1dd7e655d
chunk uuid ae6b0cc6-bbc5-4131-b3f3-41b748f5a775
key (EXTENT_TREE ROOT_ITEM 0) block 27836416 (1699) gen 2083133
key (1853 INODE_ITEM 0) block 28000256 (1709) gen 2083133
=> I *think* (but not 100% sure - would need to double check if it's
important for you to know), that the older progs/kernel showed me much
more here
# btrfs-debug-tree /dev/mapper/restore
btrfs-progs v4.15.1
Couldn't map the block 4503658729209856
No mapping for 4503658729209856-4503658729226240
Couldn't map the block 4503658729209856
bytenr mismatch, want=4503658729209856, have=0
ERROR: unable to open /dev/mapper/restore
=> same here: I *think* (but not 100% sure - would need to double check
if it's important for you to know), that the older progs/kernel showed
me much more here
# btrfs-debug-tree -b 27836416 /dev/mapper/restore
btrfs-progs v4.15.1
Couldn't map the block 4503658729209856
No mapping for 4503658729209856-4503658729226240
Couldn't map the block 4503658729209856
bytenr mismatch, want=4503658729209856, have=0
leaf 27836416 items 63 free space 6131 generation 2083133 owner 1
leaf 27836416 flags 0x1(WRITTEN) backref revision 1
fs uuid b6050e38-716a-40c3-a8df-fcf1dd7e655d
chunk uuid ae6b0cc6-bbc5-4131-b3f3-41b748f5a775
item 0 key (EXTENT_TREE ROOT_ITEM 0) itemoff 15844 itemsize 439
generation 2083133 root_dirid 0 bytenr 27328512 level 2 refs 1
lastsnap 0 byte_limit 0 bytes_used 182190080 flags 0x0(none)
uuid 00000000-0000-0000-0000-000000000000
drop key (0 UNKNOWN.0 0) level 0
item 1 key (DEV_TREE ROOT_ITEM 0) itemoff 15405 itemsize 439
generation 2083129 root_dirid 0 bytenr 9502720 level 1 refs 1
lastsnap 0 byte_limit 0 bytes_used 114688 flags 0x0(none)
uuid 00000000-0000-0000-0000-000000000000
drop key (0 UNKNOWN.0 0) level 0
item 2 key (FS_TREE INODE_REF 6) itemoff 15388 itemsize 17
index 0 namelen 7 name: default
item 3 key (FS_TREE ROOT_ITEM 0) itemoff 14949 itemsize 439
generation 2081091 root_dirid 256 bytenr 474185728 level 0 refs
1
lastsnap 0 byte_limit 0 bytes_used 16384 flags 0x0(none)
uuid 00000000-0000-0000-0000-000000000000
ctransid 2081091 otransid 0 stransid 0 rtransid 0
ctime 1519222863.366476716 (2018-02-21 15:21:03)
drop key (0 UNKNOWN.0 0) level 0
item 4 key (FS_TREE ROOT_REF 257) itemoff 14927 itemsize 22
root ref key dirid 256 sequence 2 name root
item 5 key (FS_TREE ROOT_REF 1830) itemoff 14866 itemsize 61
root ref key dirid 256 sequence 5 name
heisenberg.scientia.net_system_2018-02-21_1
item 6 key (ROOT_TREE_DIR INODE_ITEM 0) itemoff 14706 itemsize 160
generation 3 transid 0 size 0 nbytes 16384
block group 0 mode 40755 links 1 uid 0 gid 0 rdev 0
sequence 0 flags 0x0(none)
atime 1446913329.0 (2015-11-07 17:22:09)
ctime 1446913329.0 (2015-11-07 17:22:09)
mtime 1446913329.0 (2015-11-07 17:22:09)
otime 0.0 (1970-01-01 01:00:00)
item 7 key (ROOT_TREE_DIR INODE_REF 6) itemoff 14694 itemsize 12
index 0 namelen 2 name: ..
item 8 key (ROOT_TREE_DIR DIR_ITEM 2378154706) itemoff 14657 itemsize 37
location key (FS_TREE ROOT_ITEM -1) type DIR
transid 0 data_len 0 name_len 7
name: default
item 9 key (CSUM_TREE ROOT_ITEM 0) itemoff 14218 itemsize 439
generation 2083133 root_dirid 0 bytenr 27197440 level 2 refs 1
lastsnap 0 byte_limit 0 bytes_used 866926592 flags 0x0(none)
uuid 00000000-0000-0000-0000-000000000000
drop key (0 UNKNOWN.0 0) level 0
item 10 key (UUID_TREE ROOT_ITEM 0) itemoff 13779 itemsize 439
generation 2080566 root_dirid 0 bytenr 505818398720 level 0
refs 1
lastsnap 0 byte_limit 0 bytes_used 16384 flags 0x0(none)
uuid 85e68ea6-09cd-3b45-b01a-e57bcc5684ba
drop key (0 UNKNOWN.0 0) level 0
item 11 key (257 ROOT_ITEM 0) itemoff 13340 itemsize 439
generation 2083133 root_dirid 256 bytenr 27000832 level 2 refs 1
lastsnap 2080523 byte_limit 0 bytes_used 1288060928 flags
0x0(none)
uuid c37238d5-ac17-ee45-a790-b4d1538f46fc
ctransid 2083133 otransid 8 stransid 0 rtransid 0
ctime 1519231525.124530719 (2018-02-21 17:45:25)
otime 1446913423.498012409 (2015-11-07 17:23:43)
drop key (0 UNKNOWN.0 0) level 0
item 12 key (257 ROOT_BACKREF 5) itemoff 13318 itemsize 22
root backref key dirid 256 sequence 2 name root
item 13 key (979 INODE_ITEM 0) itemoff 13158 itemsize 160
generation 2081024 transid 2081024 size 262144 nbytes 3230924800
block group 0 mode 100600 links 1 uid 0 gid 0 rdev 0
sequence 12325 flags
0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
atime 0.0 (1970-01-01 01:00:00)
ctime 1519191053.828440563 (2018-02-21 06:30:53)
mtime 0.0 (1970-01-01 01:00:00)
otime 0.0 (1970-01-01 01:00:00)
item 14 key (979 EXTENT_DATA 0) itemoff 13105 itemsize 53
generation 2081024 type 1 (regular)
extent data disk byte 73967251456 nr 262144
extent data offset 0 nr 262144 ram 262144
extent compression 0 (none)
item 15 key (980 INODE_ITEM 0) itemoff 12945 itemsize 160
generation 2081024 transid 2081024 size 262144 nbytes 3137601536
block group 0 mode 100600 links 1 uid 0 gid 0 rdev 0
sequence 11969 flags
0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
atime 0.0 (1970-01-01 01:00:00)
ctime 1519191053.828440563 (2018-02-21 06:30:53)
mtime 0.0 (1970-01-01 01:00:00)
otime 0.0 (1970-01-01 01:00:00)
item 16 key (980 EXTENT_DATA 0) itemoff 12892 itemsize 53
generation 2081024 type 1 (regular)
extent data disk byte 73977970688 nr 262144
extent data offset 0 nr 262144 ram 262144
extent compression 0 (none)
item 17 key (1830 ROOT_ITEM 2080565) itemoff 12453 itemsize 439
generation 2080565 root_dirid 256 bytenr 505812746240 level 2
refs 1
lastsnap 2080565 byte_limit 0 bytes_used 1021968384 flags
0x1(RDONLY)
uuid 5247e0c0-7a79-434e-880b-d2c7941e6767
parent_uuid 04b7ff5b-31c9-4a41-ba14-7c91076f6da6
ctransid 2080561 otransid 2080565 stransid 0 rtransid 0
ctime 1519174487.202858099 (2018-02-21 01:54:47)
otime 1519174628.538451830 (2018-02-21 01:57:08)
drop key (0 UNKNOWN.0 0) level 0
item 18 key (1830 ROOT_BACKREF 5) itemoff 12392 itemsize 61
root backref key dirid 256 sequence 5 name
heisenberg.scientia.net_system_2018-02-21_1
item 19 key (1831 INODE_ITEM 0) itemoff 12232 itemsize 160
generation 2083133 transid 2083133 size 262144 nbytes 15990784
block group 0 mode 100600 links 1 uid 0 gid 0 rdev 0
sequence 61 flags 0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
atime 0.0 (1970-01-01 01:00:00)
ctime 1519231527.115322244 (2018-02-21 17:45:27)
mtime 0.0 (1970-01-01 01:00:00)
otime 0.0 (1970-01-01 01:00:00)
item 20 key (1831 EXTENT_DATA 0) itemoff 12179 itemsize 53
generation 2083133 type 1 (regular)
extent data disk byte 33299181568 nr 262144
extent data offset 0 nr 262144 ram 262144
extent compression 0 (none)
item 21 key (1832 INODE_ITEM 0) itemoff 12019 itemsize 160
generation 2083127 transid 2083127 size 262144 nbytes 8650752
block group 0 mode 100600 links 1 uid 0 gid 0 rdev 0
sequence 33 flags 0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
atime 0.0 (1970-01-01 01:00:00)
ctime 1519231352.51151791 (2018-02-21 17:42:32)
mtime 0.0 (1970-01-01 01:00:00)
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item 22 key (1832 EXTENT_DATA 0) itemoff 11966 itemsize 53
generation 2083127 type 1 (regular)
extent data disk byte 48053231616 nr 262144
extent data offset 0 nr 262144 ram 262144
extent compression 0 (none)
item 23 key (1833 INODE_ITEM 0) itemoff 11806 itemsize 160
generation 2083117 transid 2083117 size 262144 nbytes 4456448
block group 0 mode 100600 links 1 uid 0 gid 0 rdev 0
sequence 17 flags 0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
atime 0.0 (1970-01-01 01:00:00)
ctime 1519231019.230780046 (2018-02-21 17:36:59)
mtime 0.0 (1970-01-01 01:00:00)
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item 24 key (1833 EXTENT_DATA 0) itemoff 11753 itemsize 53
generation 2083117 type 1 (regular)
extent data disk byte 46261501952 nr 262144
extent data offset 0 nr 262144 ram 262144
extent compression 0 (none)
item 25 key (1834 INODE_ITEM 0) itemoff 11593 itemsize 160
generation 2083120 transid 2083120 size 262144 nbytes 2621440
block group 0 mode 100600 links 1 uid 0 gid 0 rdev 0
sequence 10 flags 0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
atime 0.0 (1970-01-01 01:00:00)
ctime 1519231097.45708714 (2018-02-21 17:38:17)
mtime 0.0 (1970-01-01 01:00:00)
otime 0.0 (1970-01-01 01:00:00)
item 26 key (1834 EXTENT_DATA 0) itemoff 11540 itemsize 53
generation 2083120 type 1 (regular)
extent data disk byte 33299738624 nr 262144
extent data offset 0 nr 262144 ram 262144
extent compression 0 (none)
item 27 key (1835 INODE_ITEM 0) itemoff 11380 itemsize 160
generation 2083121 transid 2083121 size 262144 nbytes 3407872
block group 0 mode 100600 links 1 uid 0 gid 0 rdev 0
sequence 13 flags 0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
atime 0.0 (1970-01-01 01:00:00)
ctime 1519231133.956124450 (2018-02-21 17:38:53)
mtime 0.0 (1970-01-01 01:00:00)
otime 0.0 (1970-01-01 01:00:00)
item 28 key (1835 EXTENT_DATA 0) itemoff 11327 itemsize 53
generation 2083121 type 1 (regular)
extent data disk byte 48017752064 nr 262144
extent data offset 0 nr 262144 ram 262144
extent compression 0 (none)
item 29 key (1836 INODE_ITEM 0) itemoff 11167 itemsize 160
generation 2083128 transid 2083128 size 262144 nbytes 6553600
block group 0 mode 100600 links 1 uid 0 gid 0 rdev 0
sequence 25 flags 0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
atime 0.0 (1970-01-01 01:00:00)
ctime 1519231382.739882872 (2018-02-21 17:43:02)
mtime 0.0 (1970-01-01 01:00:00)
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item 30 key (1836 EXTENT_DATA 0) itemoff 11114 itemsize 53
generation 2083128 type 1 (regular)
extent data disk byte 43620921344 nr 262144
extent data offset 0 nr 262144 ram 262144
extent compression 0 (none)
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generation 2083129 transid 2083129 size 262144 nbytes 9437184
block group 0 mode 100600 links 1 uid 0 gid 0 rdev 0
sequence 36 flags 0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
atime 0.0 (1970-01-01 01:00:00)
ctime 1519231390.216060972 (2018-02-21 17:43:10)
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item 32 key (1837 EXTENT_DATA 0) itemoff 10901 itemsize 53
generation 2083129 type 1 (regular)
extent data disk byte 43256619008 nr 262144
extent data offset 0 nr 262144 ram 262144
extent compression 0 (none)
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generation 2083133 transid 2083133 size 262144 nbytes 8126464
block group 0 mode 100600 links 1 uid 0 gid 0 rdev 0
sequence 31 flags 0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
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ctime 1519231527.115322244 (2018-02-21 17:45:27)
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generation 2083133 type 1 (regular)
extent data disk byte 44043571200 nr 262144
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extent compression 0 (none)
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sequence 20 flags 0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
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generation 2083132 type 1 (regular)
extent data disk byte 44647149568 nr 262144
extent data offset 0 nr 262144 ram 262144
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generation 2083133 type 1 (regular)
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generation 2083130 type 1 (regular)
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extent compression 0 (none)
item 59 key (1851 INODE_ITEM 0) itemoff 7972 itemsize 160
generation 2083128 transid 2083128 size 262144 nbytes 12058624
block group 0 mode 100600 links 1 uid 0 gid 0 rdev 0
sequence 46 flags 0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
atime 0.0 (1970-01-01 01:00:00)
ctime 1519231382.743882966 (2018-02-21 17:43:02)
mtime 0.0 (1970-01-01 01:00:00)
otime 0.0 (1970-01-01 01:00:00)
item 60 key (1851 EXTENT_DATA 0) itemoff 7919 itemsize 53
generation 2083128 type 1 (regular)
extent data disk byte 48013914112 nr 262144
extent data offset 0 nr 262144 ram 262144
extent compression 0 (none)
item 61 key (1852 INODE_ITEM 0) itemoff 7759 itemsize 160
generation 2083130 transid 2083130 size 262144 nbytes 4456448
block group 0 mode 100600 links 1 uid 0 gid 0 rdev 0
sequence 17 flags 0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
atime 0.0 (1970-01-01 01:00:00)
ctime 1519231423.704858756 (2018-02-21 17:43:43)
mtime 0.0 (1970-01-01 01:00:00)
otime 0.0 (1970-01-01 01:00:00)
item 62 key (1852 EXTENT_DATA 0) itemoff 7706 itemsize 53
generation 2083130 type 1 (regular)
extent data disk byte 48013127680 nr 262144
extent data offset 0 nr 262144 ram 262144
extent compression 0 (none)
=> I think at least the "magic" bytenr of 474185728 is the same as what
I got by the older progs/kernel
# btrfs restore -f 474185728 /dev/mapper/restore tmp/
Couldn't map the block 4503658729209856
No mapping for 4503658729209856-4503658729226240
Couldn't map the block 4503658729209856
bytenr mismatch, want=4503658729209856, have=0
Could not open root, trying backup super
Couldn't map the block 4503658729209856
No mapping for 4503658729209856-4503658729226240
Couldn't map the block 4503658729209856
bytenr mismatch, want=4503658729209856, have=0
Could not open root, trying backup super
Couldn't map the block 4503658729209856
No mapping for 4503658729209856-4503658729226240
Couldn't map the block 4503658729209856
bytenr mismatch, want=4503658729209856, have=0
Could not open root, trying backup super
=> tmp/ remains empty... so here is the major difference between 4.15
and the older ones
No kernel messages at all during the whole procedure.
> And strangely this time it works...
>
> >
> > dm-1 here is the external HDD (and the 130 corrupt are likely from
> > the
> > first btrfs-restore that I made while still on the NEW notebook
> > with
> > the possible bad RAM).
> >
> >
> > After that I did a fsck of the 8TB HDD / dm-1 ... and as you've
> > anyway
> > asked me above, a scrub of it.
> > Neither of both showed any errors.... (so still strange why it got
> > that
> > open_ctree error)
>
> I'm surprise the corruption just disappeared...
Anything more on this from your side (I mean this spurious "open_ctree
failed" and it's even more unexplained vanishing)?
I haven't seen it again since then and wouldn't know anything further I
could do here... so I'd just forget about it.
> Fortunately (or unfortunately), no obvious problem with v1 space
> cache
> found yet.
I assume still nothing new here? Can one thus basically use the v1
space cache again or would you still rather keep it disabled until
further investigations have been made?
Cheers&thx,
Chris.
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