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Subjectcryptoloop data corruption (was Re: Device-backed loop broken in 2.6.0-test2?)
Andrew Morton (akpm@osdl.org) wrote on 2003-08-07:
> Thomas Themel <themel@iwoars.net> wrote:
> > it seems that device backed loopback is broken in the 2.6.0-test2 series.
>
> doh.

Hm, it seems that this patch doesn't apply to 2.6.0-test3, so I assume
that the 'other fix' from -mm5 is included?

I still get data corruption on cryptoloop, but now it is a bit more
subtle... One bit of every byte at multiples of 0x200 is flipped,
starting with the one at 0x1000.

See this for a short example (xxd output of file before and after copy
to cryptoloop):

--- good.xxd 2003-08-09 22:33:21.000000000 +0200
+++ b0rk.xxd 2003-08-09 22:32:59.000000000 +0200
@@ -256,3 +256,3 @@
0000ff0: ffff ffff ffff ffff ffff ffff ffff ffff ................
-0001000: ffff ffff ffff ffff ffff ffff ffff ffff ................
+0001000: f7ff ffff ffff ffff ffff ffff ffff ffff ................
0001010: ffff ffff ffff ffff ffff ffff ffff ffff ................
@@ -288,3 +288,3 @@
00011f0: 0ae0 004b 0000 0000 0000 0960 0000 0000 ...K.......`....
-0001200: 0001 2c00 0000 0000 0025 8000 0000 ffff ..,......%......
+0001200: 0801 2c00 0000 0000 0025 8000 0000 ffff ..,......%......
0001210: ffff ffff ffff ffff ffff ffff ffff ffff ................
@@ -320,3 +320,3 @@
00013f0: ffff ffff ffff ffff ffff ffff ffff ffff ................
-0001400: ffff ffff ffff ffff ffff ffff ffff ffff ................
+0001400: f7ff ffff ffff ffff ffff ffff ffff ffff ................
0001410: ffff ffff ffff ffff ffff ffff ffff ffff ................
@@ -352,3 +352,3 @@
00015f0: ffff ffff ffff ffff ffff ffff ffff ffff ................
-0001600: ffff ffff ffff ffff ffff ffff ffff ffff ................

Any ideas what's causing this? The files are ext3 on an AES cryptoloop
backed by an IDE partition.
ciao,
--
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