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I think I'm suffering from the same issue.
I was archiving my home in 1 tar file from 1 disk to another (all EXT4) and then it got stuck. I had to restart the computer and eventually it proceeded, but I have to say, after I copy large files, the chances I can't read/open other large files are high.
Basically as long as I don't copy/manipulate large files I don't have particular issues; as soon as I try to do such operations I have to restart my pc.
I'm using:
2.6.38-11-generic #50-Ubuntu SMP Mon Sep 12 21:17:25 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
I have to say I have a pretty vanilla Ubuntu, no customization. I'm thinking about Ext4 issue because 6 months ago all my disks were Ext2 and never had an issue, but now looks like an issue after another.
Did a memcheck and it seems definitely ok.
Unfortunately it's very hard to reproduce systematically.
Cheers