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SubjectRe: Strange read data corruption on ext4/LVM/md
Managed to provoke the bug twice more on this file:

--- good 2010-05-19 22:49:00.992620437 +0200
+++ bad2 2010-05-19 23:06:36.738619944 +0200
@@ -1223670,13 +1223670,13 @@
012abf50 fa c2 39 be 53 35 a7 d4 03 1c 72 71 64 c8 02 2c |..9.S5....rqd..,|
012abf60 51 7f cc 03 96 9e a4 62 00 18 9a dc e4 f9 69 c4 |Q......b......i.|
012abf70 30 b0 47 4b d4 5f a2 ef d9 cc c3 59 c7 c5 c5 a4 |0.GK._.....Y....|
-012abf80 de af 90 f2 a6 46 36 93 4c 8c 38 95 cb 65 5a e7 |.....F6.L.8..eZ.|
-012abf90 42 ec 2f 7a 46 42 2d 01 e3 26 ce b8 14 90 d1 6b |B./zFB-..&.....k|
-012abfa0 eb 17 2e f9 42 e9 a1 e2 f9 47 b1 ac 23 7e 52 18 |....B....G..#~R.|
-012abfb0 a1 40 99 28 a4 d4 13 5e 85 54 b5 73 58 59 53 63 |.@.(...^.T.sXYSc|
-012abfc0 3e 9c 4d 0e 31 4c 70 fc ee c6 17 3d 4b 22 78 60 |>.M.1Lp....=K"x`|
-012abfd0 01 e1 2c 26 88 a5 a3 63 b9 dc a8 7f e9 90 da 53 |..,&...c.......S|
-012abfe0 f4 84 f9 b6 a0 85 ed 87 0f 6d 9f 14 04 1d 92 fa |.........m......|
+012abf80 55 dd ed 51 6d bf 0c b6 f5 79 d9 5c a5 7f de f4 |U..Qm....y.\....|
+012abf90 ff 47 61 a7 a4 fb d5 72 3e cc 74 b1 61 e4 4e fd |.Ga....r>.t.a.N.|
+012abfa0 7a 37 44 0f 32 e7 47 75 73 3a 46 16 3b d5 b0 47 |z7D.2.Gus:F.;..G|
+012abfb0 ed 24 37 22 36 98 1e 64 11 5a bf 80 63 4e b0 7b |.$7"6..d.Z..cN.{|
+012abfc0 2b 00 bc 02 10 c2 69 cf d4 82 f9 d7 ad 1e 70 37 |+.....i.......p7|
+012abfd0 37 a1 44 6a 6a cd f3 ea 31 7f 46 c5 0c 11 07 7c |7.Djj...1.F....||
+012abfe0 33 ca 6d 53 ef f1 6c 5a 0f 6d 9f 14 04 1d 92 fa |3.mS..lZ.m......|
012abff0 13 af cf 24 7b cc 09 f9 55 a5 72 4a 92 da ca bf |...${...U.rJ....|
012ac000 fd 4f 96 09 ce 07 08 e2 d3 15 a6 f4 d9 30 08 84 |.O...........0..|
012ac010 88 6b 89 8a 42 b3 56 98 9a 5f 6a 08 74 2a f5 c7 |.k..B.V.._j.t*..|
--- good 2010-05-19 22:49:00.992620437 +0200
+++ bad3 2010-05-19 23:21:17.600620102 +0200
@@ -693238,13 +693238,13 @@
00a93f50 de 0f 0d 8c f3 62 a8 fa a1 8c ec cf ca 0a 46 93 |.....b........F.|
00a93f60 4e ee 6b 03 8c 44 29 00 52 0b e6 18 0f 97 96 91 |N.k..D).R.......|
00a93f70 c0 b7 c5 8c 8b 0a 45 30 71 8a 8c 37 79 2b 0c 93 |......E0q..7y+..|
-00a93f80 87 5f e0 1f 0f 64 77 85 8d 42 db c1 01 1e d7 d8 |._...dw..B......|
-00a93f90 b0 00 2c 59 c9 c2 5f 45 50 ee c7 a5 cf 89 15 82 |..,Y.._EP.......|
-00a93fa0 9a 1e 00 f9 be 84 01 99 05 7c 70 c6 fa 1f ae 44 |.........|p....D|
-00a93fb0 e3 fa f7 a2 dc 9e 69 18 1c a2 06 5f a9 b8 65 d5 |......i...._..e.|
-00a93fc0 86 5e 97 96 08 0e a6 19 6e 65 2f 33 7f 6c 1e 3f |.^......ne/3.l.?|
-00a93fd0 39 39 e9 94 c5 e1 06 52 2b f9 27 07 90 d9 67 d1 |99.....R+.'...g.|
-00a93fe0 32 d9 4c b7 99 8a 7b e0 9b 96 9c 1d cb 5b d9 7a |2.L...{......[.z|
+00a93f80 a8 68 75 de 11 79 03 39 cc eb 1f d7 53 08 dc 0d |.hu..y.9....S...|
+00a93f90 54 e9 55 fc d1 31 5b 18 f7 75 7a 16 3c ab 53 b5 |T.U..1[..uz.<.S.|
+00a93fa0 e5 f5 ac 46 0d 4d 0e 01 e7 82 60 df 36 44 cd a9 |...F.M....`.6D..|
+00a93fb0 01 42 a8 c6 5b ee b6 c6 84 0f 8c f0 50 9d 37 98 |.B..[.......P.7.|
+00a93fc0 44 52 2c 61 08 38 b6 03 2f 67 cf a9 e6 ab 75 8f |DR,a.8../g....u.|
+00a93fd0 c8 de bc 0b 58 8b 61 68 09 34 35 11 81 23 ae cc |....X.ah.45..#..|
+00a93fe0 ef 1f 85 8f fb ea ee 17 9b 96 9c 1d cb 5b d9 7a |.............[.z|
00a93ff0 f4 46 62 60 a3 a2 10 23 1f ba a9 6c 1b 40 e2 61 |.Fb`...#...l.@.a|
00a94000 1c de ef d1 a4 67 de 38 3f d2 70 68 9f d2 44 43 |.....g.8?.ph..DC|
00a94010 c9 32 c4 8a 48 b2 0f 9b d0 d7 12 e7 4b 67 25 f1 |.2..H.......Kg%.|
Again these are "read aheads" of 104 bytes, at 1024 bytes later into
the file.

Noteworthy is also that the last three nibbles of the corruption are
always the same (xxxxx380 => xxxxxf80).
Rgds
--
-- Pierre Ossman

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