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From: Pierre Ossman on 19 May 2010 17:10
I recently upgrade the storage stack here, and now I'm getting these
weird, intermittent read errors. Nothing complains anywhere, I only
notice that data is corrupt (man am I glad some formats have CRC
checks).

The errors come and go, and re-reading the same file eventually gets
the correct data (have to get it out of the page cache first though).

Unfortunately I changed a bit too many pieces at the same time, so I'm
not sure where things are breaking. I went from ext3 on md, to ext4 on
LVM on md on new harddrives.

Still, I managed to catch a hexdump of one of these corruptions.
Perhaps someone can spot something familiar in it that reveals the
source of the issue:

--- good 2010-05-19 22:49:00.992620437 +0200
+++ bad 2010-05-19 22:48:16.928619828 +0200
@@ -1429750,13 +1429750,13 @@
015d0f50 75 ed d6 51 51 08 06 a3 8e 1f 70 aa 34 b9 74 7a |u..QQ.....p.4..tz|
015d0f60 ff 63 a2 5d 12 79 f6 ec 8a 13 32 51 1b e9 d0 9e |.c.].y....2Q.....|
015d0f70 2f 8f f1 0c 3f 95 a4 ce 09 c4 dd 5e 9e 10 d9 98 |/...?......^.....|
-015d0f80 86 db a6 48 e1 11 64 f3 dd c6 68 95 f5 41 28 e6 |...H..d...h..A(.|
-015d0f90 1a 59 4e ad 53 bc d8 55 56 26 09 bd 66 52 27 67 |.YN.S..UV&..fR'g|
-015d0fa0 e8 59 24 35 fe 74 c6 59 cb 23 4b 4c a1 ce 9b ab |.Y$5.t.Y.#KL.....|
-015d0fb0 d8 0b 22 31 9e c5 e5 89 b7 c0 87 d0 6d b9 6f 28 |.."1........m..o(|
-015d0fc0 22 a5 3a 2c 96 88 a5 5e 12 4c e4 ab 3d ab e5 27 |".:,...^.L..=..'|
-015d0fd0 58 17 c6 ff f6 66 02 e9 b2 6c f9 de d3 44 e5 6d |X....f...l...D.m|
-015d0fe0 62 21 75 d2 04 94 82 d8 42 02 07 b3 a0 f4 eb 2b |b!u.....B.......+|
+015d0f80 2b 53 f6 39 fa 9a 71 df d0 0e 7d 09 44 20 42 0c |+S.9..q...}.D B.|
+015d0f90 fa 0e 0b 71 36 19 8d d0 ed 7f c6 7f 47 8d 88 78 |...q6.......G...x|
+015d0fa0 2e 23 ab b2 8a c5 e0 b0 45 36 0c a7 f4 c4 19 7b |.#......E6......{|
+015d0fb0 d2 fe 6f 99 b0 b9 08 c4 6b 42 62 50 9b ab 75 cc |..o.....kBbP...u.|
+015d0fc0 3a 91 3e 4f b4 d0 68 5a 03 76 fc e4 ad 47 ed b3 |:.>O..hZ.v...G..|
+015d0fd0 59 04 f5 93 eb 3d fa ca 5a dc 2c 6c dd 5e da d8 |Y....=..Z.,l.^..|
+015d0fe0 71 30 75 89 12 99 a7 aa 42 02 07 b3 a0 f4 eb 2b |q0u.....B.......+|
015d0ff0 55 7f 14 78 fe de b6 65 1d 9a 24 da 32 8b 69 17 |U..x...e..$.2..i.|
015d1000 9c 27 64 a1 70 c5 48 bd 3e 6b ce 35 8d aa a9 5f |.'d.p.H.>k.5...._|
015d1010 7b 14 3e b0 58 1a 7f f3 77 02 bd bc dc fe 23 46 |{.>.X...w......#F|
@@ -2232310,13 +2232310,13 @@
0220ff50 ca a7 a7 ae b6 15 a6 6d e5 37 20 0e 60 85 14 d6 |.......m.7 .`....|
0220ff60 af f2 9d 02 79 a5 ad 94 3a fa 15 66 d0 58 52 0c |....y...:..f.XR.|
0220ff70 b1 e3 6e 5e f2 ea b3 f1 a7 10 3d eb 2b c7 df c7 |..n^......=..+...|
-0220ff80 f5 77 7e 7c 6e 09 be 03 d7 a1 af b1 31 d4 4f 77 |.w~|n.......1..Ow|
-0220ff90 da bc 16 95 45 4f 64 97 b5 95 c9 c5 ee 76 31 2b |....EOd......v1+|
-0220ffa0 dc 58 88 90 52 8e 93 cd 9f 33 74 61 34 a6 8e 0a |.X..R....3ta4....|
-0220ffb0 3e 62 8f ad d5 7b 50 ea 3b 96 72 8e 35 6a 5a 21 |>b...{P.;.r.5jZ!|
-0220ffc0 16 f4 60 ed ae 2f e8 c5 df 5f aa 15 cd 49 c1 f4 |..`../..._...I..|
-0220ffd0 b4 0b 2c 0a b4 15 82 0c e6 74 84 e6 5e d8 89 8b |..,......t..^....|
-0220ffe0 96 08 f2 e3 3e 88 79 89 9b ba b5 72 1e 93 5c 51 |....>.y....r...\Q|
+0220ff80 e7 3b 47 3d ae 02 53 d4 1a d0 24 9a 69 c6 81 8a |.;G=..S...$..i...|
+0220ff90 82 1f 4e 6b 76 de 84 da 07 5d f2 89 50 9c 01 89 |..Nkv....]..P....|
+0220ffa0 d6 03 bb 7d 15 5a 39 05 c7 ee 4e 51 4b a9 84 1c |...}.Z9...NQK....|
+0220ffb0 19 da 5e d8 95 2a 36 a5 cc 59 02 69 d6 11 e4 43 |..^..*6..Y.i....C|
+0220ffc0 5d 36 50 a0 ed 95 42 24 eb 9b e8 e7 ad 9d 23 9a |]6P...B$.......#.|
+0220ffd0 d5 cb 32 2b e0 37 16 36 96 b8 9a 01 d5 00 eb 86 |..2+.7.6.........|
+0220ffe0 09 db 97 5b 76 ed 0b 4f 9b ba b5 72 1e 93 5c 51 |...[v..O...r...\Q|
0220fff0 40 1b 68 c7 fc a8 8a 1b 16 7c 89 15 85 dc 26 df |@.h......|.....&.|
02210000 66 51 51 a5 45 4a 6c 9d 9a 98 a8 ba 72 39 77 47 |fQQ.EJl.....r9wG|
02210010 54 d0 30 94 ea 3b c0 24 12 fc cd db 64 c4 f7 71 |T.0..;.$....d...q|

Rgds
--
-- Pierre Ossman

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