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SubjectRe: 2.4.0-test11 ext2 fs corruption


On Tue, 28 Nov 2000, Petr Vandrovec wrote:

> Hi Al,
> during weekend I was uncompressing XFree (Debian's 4.0.1-7) at home,
> with 2.4.0-test11 running on Celeron 300A, 128MB RAM, SMP kernel on up.
> It failed to compile lbxproxy/di/main.c. After some investigation I found
> that they were overwritten by some source font data. fsck did not reveal
> any croslinked clusters, nothing. Filesystem itself uses 4KB clusters.
>
> Today I found some spare time and investigated it further. There is
> same data contents in:
>
> programs/lbxproxy/di/init.c 0-8720 fonts/bdf/75dpi/lubR24.bdf 0x5000-0x7210
> lbxfuncs.c 0x0000-0x0EC0 lubR24.bdf 0x8000-0x8EC0
> 0x0EC1-0x0FFF zero
> 0x1000-0x5ABC lutBS08.bdf 0x0000-0x4ABC
> 0x5ABD-0x5FFF zero
> 0x6000-0x92C1 lutBS10.bdf 0x0000-0x32C1
> lbxutil.c 0x0000-0x1E27 lutBS10.bdf 0x4000-0x5E27
> 0x1E28-0x1FFF zero
> 0x2000-0x3452 lutBS12.bdf 0x0000-0x1452
> main.c 0-4614 lutBS12.bdf 0x2000-0x3206
> options.c 0x0000-0x222E lutBS12.bdf 0x4000-0x622E
> 0x222F-0x2FFF zero
> 0x3000-0x4E30 lutBS14.bdf 0x0000-0x1E30
> pm.c 0-11706 lutBS14.bdf 0x2000-0x4DA8
> (blocks 722433-722459) (blocks 558899-~558927)
>
> Other files are intouch. As you can see, somewhat disk blocks
> ended somewhere else than they should in addition to correct place.
> I also found that data after end of file in di/*.c files are not
> cleared, so maybe that ide driver did a mistake? But I was not able
> to find how to convert either block address, or LBA adress, or CHS
> address (drive uses 839/240/63, but I hope that it runs in LBA) to
> get 558899 from 722433 or vice versa.

Erm... Do you mean that you've got a 1-1 correspondence in data between these
two ranges? Then it looks like something way below the fs level... Weird.
Could you verify it with dd?

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