file corruption in loop device in 3.4.0

[Bob Sullivan]

We have a EXT3 filesystem contained in a file
(a disk image mapped to a file using loop device).
Using diff, observed random differences between
files on the image and a backup copies of those files.
This problem is reproducible,
tried booting several times with 3.3.8 and 3.4.0.
No problems on 3.3.8.
But every time on 3.4.0, randomly a few files showed corruption.
Some files that were corrupt become ok again after rebooting/remounting.
About 5% of the file contents was garbage, rest was correct, the file size was correct.

Seems to be a memory problem in 3.4.0?
chkdsk never showed any problem (in the disk image file).

Using Debian 6.  Ran memtest86+, chkdsk, badblocks -- no errors.
Disk image was created mkfs.ext3 with the smallest inode/block size.
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