On Mon, Aug 25, 2008 at 04:59:26PM -0700, Linus Torvalds wrote: > and the difference literally seems to be just a block of less than 160 > bytes. But it's certainly not a single-bit error, and it's also not a disk > block or anything like that. > > Looking at the first line that differs, they are: > > -0003460 a0 14 8d 7d cd 12 75 81 2b c4 d9 71 27 62 ae b5 > +0003460 a0 14 8d 7d 22 00 00 00 6b 57 fe ff 55 57 fe ff > > so the differences start at offset 03464. The last line is: > > -0003700 47 f7 9b 3d b6 a5 99 5a cf 49 ef e0 3f 54 08 f4 > +0003700 ae 41 49 50 aa 40 fe ff cf 49 ef e0 3f 54 08 f4 > > so they re-join at 03708 (octal offsets because of 'od' behavior). But in > between there seems to be nothing in common. > > So the corrupt data looks like > > 22 00 00 00 6b 57 fe ff 55 57 fe ff > 0003500 aa 57 fe ff b0 00 0e 00 d9 66 22 00 00 00 00 e0 > 0003520 19 9f fe ff ff ff d1 43 fe ff d1 43 fe ff 00 c0 > 0003540 bf fe f0 33 69 bf b2 33 69 bf 00 00 00 10 01 fe > 0003560 bf fe 66 01 00 00 01 1f 37 17 2e 59 fe ff 00 00 > 0003600 00 00 c2 41 fe ff 00 00 01 1f 37 17 44 42 fe ff > 0003620 00 01 fe ff 01 1f 37 07 d4 42 fe ff 02 01 a8 44 > 0003640 00 f8 bf fe 6b 57 fe ff 55 57 fe ff 97 57 fe ff > 0003660 00 f8 bf fe 04 00 fe ff ab 45 fe ff 02 00 fe ff > 0003700 ae 41 49 50 aa 40 fe ff > > and I don't see what the patern is, except that there's a lot of "fe ff" > in there. and all aligned on 2-byte boundaries? I don't see anything suggestive there either. > 148 bytes, no obvious source. It definitely does _not_ look like > compressed input (it's too regular to be something zlib spits out), nor is > it text. Nor is it valid x86 assembly, so it's not some code-segment data > either. > > And as far as I can tell, that's the _only_ corruption in the whole file, > but I didn't really double-check. > > Does anybody see a pattern? Got me. Thanks for taking a look at it. --b. -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
