Thanks for doing this, I'll start looking into it right away.
One thing though: it's probably not the contents of struct eb
that's being corrupted, but the data the eb points to. See for
example read_extent_buffer to see how to access it. Sorry for
being unclear on this.
Thanks,
Arne
On 10.07.2012 06:16, Sami Liedes wrote:
> On Mon, Jul 09, 2012 at 11:05:47AM +0200, Arne Jansen wrote:
>>> * Just before the crash:
>>> btrfs: invalid parameters for read_extent_buffer: start (32771) > eb->len
>>> (32768). eb start is 2261163409408, level 100, generation
>>> 4412718571037421157, nritems 538968254. len param 17. debug
>>> 2/989/538968254/4412718571037421157/0x0/0/0x0/0x0
>>>
>>
>> At a first glance: the generation converted to ascii is: "ent() ==",
>> so someone is patching the memory with ascii text, possibly C source.
>> It might be interesting to dump the full contents of the eb, to get
>> a clue on the source of the data.
>
> I changed the code to dump the contents of the eb struct at the point
> where that error (btrfs: invalid parameters...) is printed, at the
> "checksum mismatch 4" site and at the "node seems invalid now" site.
> Now I have a big log of 1795 corrupted ebs. So far nothing that looks
> remotely like ascii text, though. But I have two different versions of
> the eb that caused that warning, a less corrupted one and a more
> corrupted one:
>
> ------------------------------------------------------------
> btrfs: --- start eb contents at ffff8801b13cc4c8 ---
> btrfs: ffff8801b13cc4c8: 00 80 e4 66 09 02 00 00 00 80 00 00 00 00 00 00
> ...f............
> btrfs: ffff8801b13cc4d8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc4e8: 20 00 00 00 00 00 00 00 30 00 d7 10 02 88 ff ff
> .......0.......
> btrfs: ffff8801b13cc4f8: 02 02 00 00 03 00 00 00 06 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc508: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc518: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc528: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc538: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc548: 00 00 10 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc558: 58 c5 3c b1 01 88 ff ff 58 c5 3c b1 01 88 ff ff
> X.<.....X.<.....
> btrfs: ffff8801b13cc568: 00 00 00 00 00 00 00 00 70 c5 3c b1 01 88 ff ff
> ........p.<.....
> btrfs: ffff8801b13cc578: 70 c5 3c b1 01 88 ff ff 00 00 00 00 00 00 00 00
> p.<.............
> btrfs: ffff8801b13cc588: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc598: 80 5f 9a 06 00 ea ff ff 00 86 9b 06 00 ea ff ff
> ._..............
> btrfs: ffff8801b13cc5a8: 40 4c 9a 06 00 ea ff ff 80 66 9a 06 00 ea ff ff
> @L.......f......
> btrfs: ffff8801b13cc5b8: 80 eb 9b 06 00 ea ff ff 40 05 a2 06 00 ea ff ff
> ........@.......
> btrfs: ffff8801b13cc5c8: 40 e1 9b 06 00 ea ff ff 80 c4 9c 06 00 ea ff ff
> @...............
> btrfs: ffff8801b13cc5d8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc5e8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc5f8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc608: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc618: 98 c5 3c b1 01 88 ff ff 00 00 00 00 00 00 00 00
> ..<.............
> btrfs: ffff8801b13cc628: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc638: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc648: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc658: 00 00 00 00 00 00 00 00
> ........
> btrfs: --- end eb contents at ffff8801b13cc4c8 ---
> btrfs: dm-6 checksum verify failed on 2239404212224 wanted B5F632BC found
> 3579FB59 level 160
> btrfs: node seems invalid now. checksum ok = 1
> btrfs: --- start eb contents at ffff8801b13cc4c8 ---
> [... identical dump to above ...]
> btrfs: --- end eb contents at ffff8801b13cc4c8 ---
> btrfs: invalid parameters for read_extent_buffer: start (32771) > eb->len
> (32768). eb start is 2239404212224, level 160, generation
> 4716553384049587249, nritems 295705211. len param 17. debug
> 2/989/295705211/4716553384049587249/0x0/0/0x0/0x0
> btrfs: --- start eb contents at ffff8801b13cc4c8 ---
> btrfs: ffff8801b13cc4c8: 00 80 e4 66 09 02 00 00 00 80 00 00 00 00 00 00
> ...f............
> btrfs: ffff8801b13cc4d8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc4e8: 20 00 00 00 00 00 00 00 30 00 d7 10 02 88 ff ff
> .......0.......
> btrfs: ffff8801b13cc4f8: 02 02 00 00 03 00 00 00 06 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc508: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc518: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc528: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc538: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc548: 00 00 10 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc558: 58 c5 3c b1 01 88 ff ff 58 c5 3c b1 01 88 ff ff
> X.<.....X.<.....
> btrfs: ffff8801b13cc568: 00 00 00 00 00 00 00 00 70 c5 3c b1 01 88 ff ff
> ........p.<.....
> btrfs: ffff8801b13cc578: 70 c5 3c b1 01 88 ff ff 00 00 00 00 00 00 00 00
> p.<.............
> btrfs: ffff8801b13cc588: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc598: 80 5f 9a 06 00 ea ff ff 00 86 9b 06 00 ea ff ff
> ._..............
> btrfs: ffff8801b13cc5a8: 40 4c 9a 06 00 ea ff ff 80 66 9a 06 00 ea ff ff
> @L.......f......
> btrfs: ffff8801b13cc5b8: 80 eb 9b 06 00 ea ff ff 40 05 a2 06 00 ea ff ff
> ........@.......
> btrfs: ffff8801b13cc5c8: 40 e1 9b 06 00 ea ff ff 80 c4 9c 06 00 ea ff ff
> @...............
> btrfs: ffff8801b13cc5d8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc5e8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc5f8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc608: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc618: 98 c5 3c b1 01 88 ff ff 02 00 00 00 00 00 00 00
> ..<.............
> btrfs: ffff8801b13cc628: dd 03 00 00 00 00 00 00 7b 1a a0 11 00 00 00 00
> ........{.......
> btrfs: ffff8801b13cc638: 31 34 71 3c 50 90 74 41 00 00 00 00 00 00 00 00
> 14q<P.tA........
> btrfs: ffff8801b13cc648: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801b13cc658: 00 00 00 00 00 00 00 00
> ........
> btrfs: --- end eb contents at ffff8801b13cc4c8 ---
> ------------[ cut here ]------------
> WARNING: at fs/btrfs/extent_io.c:4533 read_extent_buffer+0x1ef/0x220 [btrfs]()
> Hardware name: System Product Name
> Modules linked in: <omitted> [last unloaded: scsi_wait_scan]
> Pid: 25829, comm: btrfs-endio-met Tainted: G W 3.4.4+btrfsdebug3+ #4
> [...]
> ------------------------------------------------------------
>
> Here's the difference (lines reordered from diff to make comparing
> easier):
>
> ------------------------------------------------------------
> -btrfs: ffff8801b13cc618: 98 c5 3c b1 01 88 ff ff 00 00 00 00 00 00 00 00
> ..<.............
> +btrfs: ffff8801b13cc618: 98 c5 3c b1 01 88 ff ff 02 00 00 00 00 00 00 00
> ..<.............
> -btrfs: ffff8801b13cc628: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> +btrfs: ffff8801b13cc628: dd 03 00 00 00 00 00 00 7b 1a a0 11 00 00 00 00
> ........{.......
> -btrfs: ffff8801b13cc638: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> +btrfs: ffff8801b13cc638: 31 34 71 3c 50 90 74 41 00 00 00 00 00 00 00 00
> 14q<P.tA........
> ------------------------------------------------------------
>
> If there's one pattern that catches eye in the dumps, it's that in
> many places where the same eb is dumped multiple times due to multiple
> "checksum mismatch 4"s, there are bytes at offsets 0x30 and 0x31 that
> always seem to have the same value and both separately increase
> between the dumps, usually(?) by two. Then that might be normal, I
> haven't looked at what should be at a struct eb :) There are some
> instances where they wrap, for example
>
> f8 f8 -> fa fa -> fc fc -> fe fe -> 00 00 -> 02 02 -> ...,
>
> with no other changes visible in the corrupted ebs. But that is by no
> means the only change in the struct eb contents that can be observed,
> only the most obvious pattern.
>
> For example, here's a 11-long string of eb contents. First the dmesg:
>
> ------------------------------------------------------------
> btrfs: dm-6 checksum verify failed on 1127200522240 wanted 7712C045 found
> C593E2D6 level 2
> btrfs: checksum mismatch 4 on 1127200522240
> [DUMP 1]
> btrfs: dm-6 checksum verify failed on 1127200522240 wanted 7712C045 found
> C593E2D6 level 2
> btrfs: checksum mismatch 4 on 1127200522240
> [DUMP 2]
> btrfs: dm-6 checksum verify failed on 1127200522240 wanted 7712C045 found
> C593E2D6 level 2
> btrfs: checksum mismatch 4 on 1127200522240
> [DUMP 3]
> btrfs: dm-6 checksum verify failed on 1127200522240 wanted 7712C045 found
> C593E2D6 level 2
> btrfs: checksum mismatch 4 on 1127200522240
> [DUMP 4]
> btrfs: dm-6 checksum verify failed on 1127200522240 wanted 7712C045 found
> C593E2D6 level 2
> btrfs: checksum mismatch 4 on 1127200522240
> [DUMP 5]
> btrfs: dm-6 checksum verify failed on 1127200522240 wanted 7712C045 found
> C593E2D6 level 2
> btrfs: checksum mismatch 4 on 1127200522240
> [DUMP 6]
> btrfs: dm-6 checksum verify failed on 1127200522240 wanted 7712C045 found
> C593E2D6 level 2
> btrfs: checksum mismatch 4 on 1127200522240
> [DUMP 7]
> btrfs: dm-6 checksum verify failed on 1127200522240 wanted 7712C045 found
> C593E2D6 level 2
> btrfs: checksum mismatch 4 on 1127200522240
> [DUMP 8]
> btrfs: dm-6 checksum verify failed on 1127200522240 wanted 7712C045 found
> C593E2D6 level 2
> btrfs: checksum mismatch 4 on 1127200522240
> [DUMP 9]
> btrfs: dm-6 checksum verify failed on 1127200522240 wanted 7712C045 found
> C593E2D6 level 2
> btrfs: checksum mismatch 4 on 1127200522240
> [DUMP 10]
> btrfs: dm-6 checksum verify failed on 1127200522240 wanted 7712C045 found
> C593E2D6 level 2
> btrfs: checksum mismatch 4 on 1127200522240
> [DUMP 11]
> ------------------------------------------------------------
>
> Where DUMP 1 contents (file cc1.txt if you'd want to apply the diffs
> below) is
>
> ------------------------------------------------------------
> btrfs: --- start eb contents at ffff8801cafbacc0 ---
> btrfs: ffff8801cafbacc0: 00 00 63 72 06 01 00 00 00 80 00 00 00 00 00 00
> ..cr............
> btrfs: ffff8801cafbacd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbace0: 35 00 00 00 00 00 00 00 30 00 d7 10 02 88 ff ff
> 5.......0.......
> btrfs: ffff8801cafbacf0: 13 13 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad20: 22 1c 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> "...............
> btrfs: ffff8801cafbad30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad40: 00 00 10 00 00 00 00 00 04 04 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad50: 50 ad fb ca 01 88 ff ff 50 ad fb ca 01 88 ff ff
> P.......P.......
> btrfs: ffff8801cafbad60: 02 02 00 00 00 00 00 00 68 ad fb ca 01 88 ff ff
> ........h.......
> btrfs: ffff8801cafbad70: 68 ad fb ca 01 88 ff ff 00 00 00 00 00 00 00 00
> h...............
> btrfs: ffff8801cafbad80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad90: 00 a2 20 08 00 ea ff ff c0 2a f4 07 00 ea ff ff ..
> ......*......
> btrfs: ffff8801cafbada0: 00 ac 89 07 00 ea ff ff c0 42 79 07 00 ea ff ff
> .........By.....
> btrfs: ffff8801cafbadb0: 80 af 77 07 00 ea ff ff 40 37 49 08 00 ea ff ff
> ..w.....@7I.....
> btrfs: ffff8801cafbadc0: 80 6d f3 07 00 ea ff ff c0 a7 e8 07 00 ea ff ff
> .m..............
> btrfs: ffff8801cafbadd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbade0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbadf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbae00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbae10: 90 ad fb ca 01 88 ff ff 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbae20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbae30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbae40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbae50: 00 00 00 00 00 00 00 00
> ........
> btrfs: --- end eb contents at ffff8801cafbacc0 ---
> ------------------------------------------------------------
>
> And the successive diffs are
>
> ------------------------------------------------------------
> --- cc1.txt 2012-07-10 06:57:21.564665577 +0300
> +++ cc2.txt 2012-07-10 06:59:10.272634578 +0300
> @@ -2,7 +2,7 @@
> btrfs: ffff8801cafbacc0: 00 00 63 72 06 01 00 00 00 80 00 00 00 00 00 00
> ..cr............
> btrfs: ffff8801cafbacd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbace0: 35 00 00 00 00 00 00 00 30 00 d7 10 02 88 ff ff
> 5.......0.......
> -btrfs: ffff8801cafbacf0: 13 13 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ................
> +btrfs: ffff8801cafbacf0: 15 15 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad20: 22 1c 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> "...............
> @@ -20,9 +20,9 @@
> btrfs: ffff8801cafbade0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbadf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbae00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> -btrfs: ffff8801cafbae10: 90 ad fb ca 01 88 ff ff 00 00 00 00 00 00 00 00
> ................
> -btrfs: ffff8801cafbae20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> -btrfs: ffff8801cafbae30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> +btrfs: ffff8801cafbae10: 90 ad fb ca 01 88 ff ff 01 00 00 00 00 00 00 00
> ................
> +btrfs: ffff8801cafbae20: 4d 00 00 00 00 00 00 00 4e 00 00 00 00 00 00 00
> M.......N.......
> +btrfs: ffff8801cafbae30: 07 78 02 00 00 00 00 00 00 00 00 00 00 00 00 00
> .x..............
> btrfs: ffff8801cafbae40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbae50: 00 00 00 00 00 00 00 00
> ........
> btrfs: --- end eb contents at ffff8801cafbacc0 ---
> --- cc2.txt 2012-07-10 06:59:10.272634578 +0300
> +++ cc3.txt 2012-07-10 06:59:10.016634663 +0300
> @@ -2,7 +2,7 @@
> btrfs: ffff8801cafbacc0: 00 00 63 72 06 01 00 00 00 80 00 00 00 00 00 00
> ..cr............
> btrfs: ffff8801cafbacd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbace0: 35 00 00 00 00 00 00 00 30 00 d7 10 02 88 ff ff
> 5.......0.......
> -btrfs: ffff8801cafbacf0: 15 15 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ................
> +btrfs: ffff8801cafbacf0: 17 17 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad20: 22 1c 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> "...............
> --- cc3.txt 2012-07-10 06:59:10.016634663 +0300
> +++ cc4.txt 2012-07-10 06:59:09.752634749 +0300
> @@ -2,7 +2,7 @@
> btrfs: ffff8801cafbacc0: 00 00 63 72 06 01 00 00 00 80 00 00 00 00 00 00
> ..cr............
> btrfs: ffff8801cafbacd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbace0: 35 00 00 00 00 00 00 00 30 00 d7 10 02 88 ff ff
> 5.......0.......
> -btrfs: ffff8801cafbacf0: 17 17 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ................
> +btrfs: ffff8801cafbacf0: 19 19 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad20: 22 1c 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> "...............
> --- cc4.txt 2012-07-10 06:59:09.752634749 +0300
> +++ cc5.txt 2012-07-10 06:59:09.504634831 +0300
> @@ -2,7 +2,7 @@
> btrfs: ffff8801cafbacc0: 00 00 63 72 06 01 00 00 00 80 00 00 00 00 00 00
> ..cr............
> btrfs: ffff8801cafbacd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbace0: 35 00 00 00 00 00 00 00 30 00 d7 10 02 88 ff ff
> 5.......0.......
> -btrfs: ffff8801cafbacf0: 19 19 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ................
> +btrfs: ffff8801cafbacf0: 1b 1b 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad20: 22 1c 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> "...............
> --- cc5.txt 2012-07-10 06:59:09.504634831 +0300
> +++ cc6.txt 2012-07-10 06:59:09.240634917 +0300
> @@ -2,7 +2,7 @@
> btrfs: ffff8801cafbacc0: 00 00 63 72 06 01 00 00 00 80 00 00 00 00 00 00
> ..cr............
> btrfs: ffff8801cafbacd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbace0: 35 00 00 00 00 00 00 00 30 00 d7 10 02 88 ff ff
> 5.......0.......
> -btrfs: ffff8801cafbacf0: 1b 1b 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ................
> +btrfs: ffff8801cafbacf0: 1d 1d 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad20: 22 1c 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> "...............
> --- cc6.txt 2012-07-10 06:59:09.240634917 +0300
> +++ cc7.txt 2012-07-10 06:59:08.944635015 +0300
> @@ -2,7 +2,7 @@
> btrfs: ffff8801cafbacc0: 00 00 63 72 06 01 00 00 00 80 00 00 00 00 00 00
> ..cr............
> btrfs: ffff8801cafbacd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbace0: 35 00 00 00 00 00 00 00 30 00 d7 10 02 88 ff ff
> 5.......0.......
> -btrfs: ffff8801cafbacf0: 1d 1d 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ................
> +btrfs: ffff8801cafbacf0: 1f 1f 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad20: 22 1c 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> "...............
> --- cc7.txt 2012-07-10 06:59:08.944635015 +0300
> +++ cc8.txt 2012-07-10 06:59:08.656635109 +0300
> @@ -2,7 +2,7 @@
> btrfs: ffff8801cafbacc0: 00 00 63 72 06 01 00 00 00 80 00 00 00 00 00 00
> ..cr............
> btrfs: ffff8801cafbacd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbace0: 35 00 00 00 00 00 00 00 30 00 d7 10 02 88 ff ff
> 5.......0.......
> -btrfs: ffff8801cafbacf0: 1f 1f 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ................
> +btrfs: ffff8801cafbacf0: 21 21 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> !!..............
> btrfs: ffff8801cafbad00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad20: 22 1c 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> "...............
> --- cc8.txt 2012-07-10 06:59:08.656635109 +0300
> +++ cc9.txt 2012-07-10 06:59:08.328635216 +0300
> @@ -2,7 +2,7 @@
> btrfs: ffff8801cafbacc0: 00 00 63 72 06 01 00 00 00 80 00 00 00 00 00 00
> ..cr............
> btrfs: ffff8801cafbacd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbace0: 35 00 00 00 00 00 00 00 30 00 d7 10 02 88 ff ff
> 5.......0.......
> -btrfs: ffff8801cafbacf0: 21 21 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> !!..............
> +btrfs: ffff8801cafbacf0: 23 23 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ##..............
> btrfs: ffff8801cafbad00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad20: 22 1c 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> "...............
> --- cc9.txt 2012-07-10 06:59:08.328635216 +0300
> +++ cc10.txt 2012-07-10 06:58:33.180646115 +0300
> @@ -2,7 +2,7 @@
> btrfs: ffff8801cafbacc0: 00 00 63 72 06 01 00 00 00 80 00 00 00 00 00 00
> ..cr............
> btrfs: ffff8801cafbacd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbace0: 35 00 00 00 00 00 00 00 30 00 d7 10 02 88 ff ff
> 5.......0.......
> -btrfs: ffff8801cafbacf0: 23 23 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ##..............
> +btrfs: ffff8801cafbacf0: 25 25 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> %%..............
> btrfs: ffff8801cafbad00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad20: 22 1c 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> "...............
> --- cc10.txt 2012-07-10 06:58:33.180646115 +0300
> +++ cc11.txt 2012-07-10 06:58:41.340643696 +0300
> @@ -2,7 +2,7 @@
> btrfs: ffff8801cafbacc0: 00 00 63 72 06 01 00 00 00 80 00 00 00 00 00 00
> ..cr............
> btrfs: ffff8801cafbacd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbace0: 35 00 00 00 00 00 00 00 30 00 d7 10 02 88 ff ff
> 5.......0.......
> -btrfs: ffff8801cafbacf0: 25 25 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> %%..............
> +btrfs: ffff8801cafbacf0: 27 27 00 00 03 00 00 00 00 00 00 00 00 00 00 00
> ''..............
> btrfs: ffff8801cafbad00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> ................
> btrfs: ffff8801cafbad20: 22 1c 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> "...............
> ------------------------------------------------------------
>
> And since it's of course possible there's something wrong with my
> modifications, here's the patch I used:
>
> ------------------------------------------------------------
> diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
> index 7452ecb..aadb82c 100644
> --- a/fs/btrfs/extent_io.c
> +++ b/fs/btrfs/extent_io.c
> @@ -4527,6 +4527,9 @@ void read_extent_buffer(struct extent_buffer *eb, void
> *dstv,
> len,
> eb->debug[0], eb->debug[1], eb->debug[2], eb->debug[3],
> eb->debug[4], eb->debug[5], eb->debug[6], eb->debug[7]);
> + printk(KERN_ERR "btrfs: --- start eb contents at %p ---\n", eb);
> + print_hex_dump(KERN_ERR, "btrfs: ", DUMP_PREFIX_ADDRESS, 16, 1,
> eb, sizeof(*eb), true);
> + printk(KERN_ERR "btrfs: --- end eb contents at %p ---\n", eb);
> WARN_ON(1);
> }
> WARN_ON(start + len > eb->start + eb->len);
> diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
> index ea81bd4..663d6c4 100644
> --- a/fs/btrfs/reada.c
> +++ b/fs/btrfs/reada.c
> @@ -130,9 +130,13 @@ static int __readahead_hook(struct btrfs_root *root,
> struct extent_buffer *eb,
> kref_get(&re->refcnt);
> spin_unlock(&fs_info->reada_lock);
>
> - if (!err && btrfs_csum_tree_block(root, eb))
> + if (!err && btrfs_csum_tree_block(root, eb)) {
> printk(KERN_ERR "btrfs: checksum mismatch 4 on %llu\n",
> eb->start);
> + printk(KERN_ERR "btrfs: --- start eb contents at %p ---\n", eb);
> + print_hex_dump(KERN_ERR, "btrfs: ", DUMP_PREFIX_ADDRESS, 16, 1,
> eb, sizeof(*eb), true);
> + printk(KERN_ERR "btrfs: --- end eb contents at %p ---\n", eb);
> + }
>
> if (!re)
> return -1;
> @@ -150,9 +154,14 @@ static int __readahead_hook(struct btrfs_root *root,
> struct extent_buffer *eb,
> if (err == 0) {
> nritems = level ? btrfs_header_nritems(eb) : 0;
> if (level > BTRFS_MAX_LEVEL ||
> - nritems > BTRFS_NODEPTRS_PER_BLOCK(root))
> + nritems > BTRFS_NODEPTRS_PER_BLOCK(root)) {
> printk(KERN_ERR "btrfs: node seems invalid now.
> checksum ok = %d\n",
> btrfs_csum_tree_block(root, eb));
> + printk(KERN_ERR "btrfs: --- start eb contents at %p
> ---\n", eb);
> + print_hex_dump(KERN_ERR, "btrfs: ",
> DUMP_PREFIX_ADDRESS, 16, 1, eb, sizeof(*eb), true);
> + printk(KERN_ERR "btrfs: --- end eb contents at %p
> ---\n", eb);
> +
> + }
> generation = btrfs_header_generation(eb);
> /*
> * FIXME: currently we just set nritems to 0 if this is a leaf,
>
> ------------------------------------------------------------
>
> Sami
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